                 Changes in version 3.6-3 (2026-09-28)                  

OVERVIEW

    o   New extension package 'spatstat.convert'.

    o   Vignettes updated.

SIGNIFICANT USER-VISIBLE CHANGES

    o   package 'spatstat.convert'
	   This new extension package provides code for converting spatial data
	   between the formats defined in 'spatstat' and the 
	   the packages 'sp', 'sf' and 'terra'.

    o   spatstat.family
	   The list of extension packages now includes 'spatstat.convert'.

    o   vignettes 'NAobjects', 'shapefiles', 'replicated'
	   These vignettes have been updated to reflect current code.

                 Changes in version 3.6-2 (2026-07-31)                  

OVERVIEW

    o   New functionality in sub-packages.

    o   Updated documentation.

                 Changes in version 3.6-1 (2026-06-02)                  

OVERVIEW

    o   New functionality in spatstat.sparse, spatstat.univar, spatstat.random

    o   More changes in spatstat.explore

                 Changes in version 3.6-0 (2026-04-02)                  

OVERVIEW

    o   Substantial changes in spatstat.geom and spatstat.explore.

    o   Updated version dependencies.

    o   Updated documentation.

                 Changes in version 3.5-1 (2026-02-01)                  

OVERVIEW

    o   spatstat now exceeds 200,000 lines of code.

    o   Internal improvements.

                 Changes in version 3.5-0 (2025-12-01)                  

OVERVIEW

    o   Updated version dependencies for spatstat package family.

    o   Updated documentation.

                 Changes in version 3.4-1 (2025-09-28)                  

OVERVIEW

    o   New vignette 'NAobjects' on missing/unavailable objects.

                 Changes in version 3.4-0 (2025-07-25)                  

OVERVIEW

    o   Updated version dependencies for spatstat package family.

    o   Updated documentation.

    o   Updated demo(spatstat)

                 Changes in version 3.3-3 (2025-05-24)                  

OVERVIEW

    o   Updated version dependencies for spatstat package family.

    o   Updated documentation.

                 Changes in version 3.3-2 (2025-03-22)                  

OVERVIEW

    o   Updated version dependencies for spatstat package family.

    o   Updated documentation.

    o   Bug fix in 'bugfixes'

BUG FIXES

    o   bugfixes
	   Crashed on some installations due to problems with file permissions.
	   Fixed.

                 Changes in version 3.3-1 (2025-01-23)                  

OVERVIEW

    o   Updated version dependencies for spatstat package family.

    o   Updated documentation.

                 Changes in version 3.3-0 (2024-11-20)                  

OVERVIEW

    o   Updated version dependencies for spatstat package family.

    o   Updated documentation.

                 Changes in version 3.2-1 (2024-09-22)                  

OVERVIEW

    o   List the history of all changes made to a function in spatstat.

NEW FUNCTIONS

    o   latest.changes
	   Lists the recent changes that have been made to
	   a particular function in the spatstat family of packages.

                        Changes in version 3.2-0                        

OVERVIEW

    o   Tweaks to documentation.

                 Changes in version 3.1-1 (2024-07-15)                  

OVERVIEW

    o   Internal changes to satisfy CRAN.

                        Changes in version 3.1-0                        

OVERVIEW

    o   New package 'spatstat.univar'

    o   Minor internal improvements.

PACKAGE DEPENDENCE

    o   spatstat.univar
	   The new package 'spatstat.univar' has joined the spatstat family.
	   It supports estimation and manipulation of probability distributions
	   of one-dimensional random variables.
	   Some functions have been moved from 'spatstat.geom', 'spatstat.random'
	   and 'spatstat.explore' into the new package 'spatstat.univar'.

SIGNIFICANT USER-VISIBLE CHANGES

    o   spatstat.family
	   The list of sub-packages now includes 'spatstat.univar'.

                 Changes in version 3.0-8 (2024-03-26)                  

OVERVIEW

    o   Updated package dependencies and documentation.

    o   Vignette on shapefiles updated and reinstated.

SIGNIFICANT USER-VISIBLE CHANGES

    o   Vignette 'shapefiles'
	   This vignette has been updated. The new version uses
	   package 'sf' instead of the defunct package 'maptools'.

                 Changes in version 3.0-7 (2023-10-30)                  

OVERVIEW

    o   New vignette on function objects (class 'fv' and 'envelope')

    o   Vignette on shapefiles temporarily removed.

    o   Updated cross-references to sub-packages.

    o   Minor changes to package information.

SIGNIFICANT USER-VISIBLE CHANGES

    o   Vignette 'fv'
	   New vignette which explains how to manipulate and plot
	   objects of class 'fv' and 'envelope'.

    o   Vignette 'shapefiles'
	   This vignette has been temporarily removed because of its dependence
	   on the defunct packages 'sp' and 'maptools'. It will be rewritten
	   and reinstated soon.

                 Changes in version 3.0-6 (2023-05-17)                  

OVERVIEW

    o   Updated cross-references to sub-packages.

    o   Package documentation corrected and updated.

                 Changes in version 3.0-5 (2023-04-22)                  

OVERVIEW

    o   Package documentation repaired (latex package issues).

                        Changes in version 3.0-4                        

OVERVIEW

    o   Package version information updated.

    o   Minor omissions corrected in vignettes.

    o   Package documentation corrected and updated.

                 Changes in version 3.0-3 (2023-01-28)                  

OVERVIEW

    o   Package version information updated.

    o   Minor errors corrected in vignettes.

                 Changes in version 3.0-2 (2022-11-10)                  

OVERVIEW

    o   Internal tweaks.

                        Changes in version 3.0-1                        

OVERVIEW

    o   Package nicknames are temporarily suppressed.

                        Changes in version 3.0-0                        

OVERVIEW

    o   Further split of the spatstat family of packages.

    o   All package versions have been updated to 3.0-x.

SIGNIFICANT USER-VISIBLE CHANGES

    o   Package structure
	   The package 'spatstat.core' has been split into two packages called
	   'spatstat.explore' (for exploratory data analysis)
	   and 'spatstat.model' (for modelling and formal inference).

    o   Package dependence
	   'spatstat' now depends on the new packages 'spatstat.explore'
	   and 'spatstat.model' which have replaced the old package 'spatstat.core'.

    o   spatstat.family
	   Packages 'spatstat.explore' and 'spatstat.model' have been added
	   and 'spatstat.core' has been deleted from the list of packages.

    o   bugfixes, latest.news
	   Updated to cover the new sub-packages 'spatstat.explore'
	   and 'spatstat.model'.

                 Changes in version 2.3-4 (2022-04-01)                  

OVERVIEW

    o   Minor bug fixes and improvements.

BUG FIXES

    o   latest.news
	   Did not include news from the new package 'spatstat.random'.
	   Fixed.

    o   spatstat.family
	   Omitted the new package 'spatstat.random'.
	   Fixed.

                 Changes in version 2.3-3 (2022-02-21)                  

OVERVIEW

    o   Minor internal changes.

                        Changes in version 2.3-1                        

OVERVIEW

    o   spatstat depends on the package 'spatstat.random'

SIGNIFICANT USER-VISIBLE CHANGES

    o   package dependence
	   spatstat now depends on the new package 'spatstat.random'.

                 Changes in version 2.3-0 (2021-12-12)                  

OVERVIEW

    o   Minor tweaks to package information and documentation

    o   The NEWS file for package='spatstat' now contains only
	   the news for the sub-package 'spatstat'. Other changes in the spatstat
	   family of packages are reported in the NEWS file for the relevant
	   sub-package.

    o   'latest.news' now collects news from all packages in the spatstat family

    o   'bugfixes' now collects bug fixes from all packages in the spatstat family

    o   New function 'spatstat.family'

NEW FUNCTIONS

    o   spatstat.family
	   Return the names of all packages in the spatstat family.

SIGNIFICANT USER-VISIBLE CHANGES

    o   latest.news
	   Now gives the latest news for all packages in the spatstat family.

    o   bugfixes
	   Now lists bugs reported for all packages in the spatstat family.

                 Changes in version 2.2-0 (2021-06-23)                  

OVERVIEW

    o   Minor tweaks to package information

                 Changes in version 2.1-0 (2021-04-03)                  

OVERVIEW

    o   Minor changes to package structure.

                 Changes in version 2.0-1 (2021-03-13)                  

OVERVIEW

    o   Minor changes to satisfy CRAN checks.

                        Changes in version 2.0-0                        

OVERVIEW

    o   We thank Corey Anderson, Michael Chirico, Andy Craig,
	   Marcelino de la Cruz, Tilman Davies, Pavel Fibich,
	   Kurt Hornik, Gopalan Nair, Yonatan Rosen and Rasmus Waagepetersen
	   for contributions.

    o   spatstat has been divided into 7 sub-packages
	   (spatstat.utils, spatstat.data, spatstat.sparse,
	   spatstat.geom, spatstat.core, spatstat.linnet and spatstat).

    o   spatstat now depends on R version 3.5.0 or later.

    o   Version nickname: "Caution: contains small parts"

SIGNIFICANT USER-VISIBLE CHANGES

    o   package structure
	   The original 'spatstat' package has been divided into 7 sub-packages
	   (spatstat.utils, spatstat.data, spatstat.sparse,
	   spatstat.geom, spatstat.core, spatstat.linnet and spatstat).
	   The remaining 'spatstat' package requires all the other sub-packages.
	   Your existing code scripts should still work with minimal changes.

    o   sessionInfo
	   Output now lists packages that are imported but not loaded.

    o   sessionLibs
	   Package names are now sorted alphabetically.

                 Changes in version 1.64-1 (2020-05-12)                 

OVERVIEW

    o   Important bug fix in vcov.ppm

    o   Relative risk estimation may include case weights.

    o   We thank Ian Buller, Brian Ripley, Maximilian Vogtland
	   and Maximilian Hesselbarth for contributions.

    o   Nickname: 'Help you I can, yes!'

SIGNIFICANT USER-VISIBLE CHANGES

    o   rshift.ppp, rshift.splitppp
	   New argument 'nsim'.

    o   relrisk.ppp
	   New argument 'weights'.

    o   density.splitppp
	   New argument 'weights'.

BUG FIXES

    o   vcov.ppm
	   Variances were sometimes overestimated for Gibbs models.
	   That is, entries of the Fisher information matrix were underestimated,
	   because some contributions due to interaction were omitted
	   (due to a coding error).
	   Fixed.

    o   density.ppp
	   Crashed when se=TRUE if there were multiple columns of 'weights'.
	   Fixed.

    o   rbind.hyperframe
	   Crashed unless all arguments had the same number of rows.
	   (Spotted by Maximilian Vogtland).
	   Fixed.

                       Changes in version 1.64-0                        

OVERVIEW

    o   We thank Robert Aue, Tilman Davies, Greg McSwiggan, Tyler Rudolph
	   and Rasmus Plenge Waagepetersen for contributions.

    o   Interactive graphics functions have been removed to a separate package.

    o   spatstat no longer needs the packages 'tcltk' and 'rpanel'.

    o   The suggested package 'maptools' should be version 0.9-9 or later.

    o   Important bug fix in density.ppp.

    o   Add new vertices to a linear network.

    o   Relative risk estimation on a network.

    o   Leave-one-out density estimation on a network.

    o   Improvements and extensions to linear networks code.

    o   Improvements to 'nndist' methods.

    o   Function lengths.psp has been renamed lengths_psp.

    o   Bug fixes related to mppm.

    o   Stability improvements.

    o   Version nickname: 'Susana Distancia'

NEW FUNCTIONS

    o   relrisk.lpp
	   Method for 'relrisk' for point patterns on a linear network.

    o   bw.relrisklpp
	   Bandwidth selection for relative risk on a network.

    o   densityfun.lpp
	   Method for 'densityfun' for point patterns on a linear network.

    o   addVertices
	   Add new vertices to a network, at locations outside the existing network.

    o   lengths_psp
	   This is the new name of the function 'lengths.psp',
	   which had to be changed because of a conflict with the generic 'lengths'.

    o   densityEqualSplit
	   The equal-split algorithm for kernel density estimation on a network
	   is now visible as a separate function.

    o   densityHeat
	   The heat-equation algorithm for kernel density estimation on a network
	   is now visible as a separate function. It has also been extended
	   to computing leave-one-out density estimates at the data points.

    o   hotrod
	   Compute the heat kernel kappa(u,v) on a one-dimensional line segment.

    o   heatkernelapprox
	   Calculate an approximation to the value of the heat kernel
	   on a network evaluated at the source point, kappa(u,u).

SIGNIFICANT USER-VISIBLE CHANGES

    o   nndist.pp3, nndist.ppx, nndist.lpp
	   These functions now recognise the argument 'by'
	   allowing computation of the nearest distance to each group of points.

    o   pairdist.lpp, crossdist.lpp
	   These functions can now handle large networks,
	   using the sparse representation.

    o   density.lpp, densityQuick.lpp
	   Infinite bandwidth (sigma=Inf) is now permitted,
	   and results in a density estimate that is constant over all locations.

    o   as.linnet.psp
	   The resulting network now has an attribute 'camefrom'
	   indicating the provenance of each line segment in the network.

    o   as.linnet.linnet
	   New argument 'maxsize'.

    o   repairNetwork
	   Increased capability of detecting and repairing inconsistencies.

    o   joinVertices
	   New argument 'marks'.

    o   insertVertices
	   Marks attached to the lines of the network are now retained.

    o   as.lpp
	   Accepts more data formats.

    o   iplot, iplot.ppp, iplot.layered, iplot.linnet, iplot.default
	   These interactive plotting functions have been removed from spatstat
	   into a new package 'spatstat.gui'

    o   istat
	   This interactive analysis function has been removed from spatstat
	   into a new package 'spatstat.gui'

    o   crossdist.lpp
	   New argument 'check'.

    o   lengths.psp
	   This function will soon be Deprecated,
	   in favour of the new name 'lengths_psp'

    o   density.lpp
	   Formal arguments changed. No effect on usage.

    o   integral.linim
	   Now handles complex-valued functions.

    o   transect.im
	   New argument 'nsample'.

    o   bw.lppl
	   Accelerated when distance="path".

    o   collapse.fv
	   Recognises the abbreviations used by fvnames()

BUG FIXES

    o   density.ppp
	   Edge correction factors were calculated incorrectly when the
	   window was not a rectangle, causing a negative bias in the
	   estimated intensity. [Spotted by Tilman Davies.]
	   Bug introduced in spatstat 1.57-0, october 2018.
	   Fixed.

    o   mppm
	   Internal data were malformed if the interaction was Hardcore()
	   or MultiHard() or a hybrid involving these interactions.
	   This caused various errors when the fitted model was used.
	   Fixed.

    o   mppm
	   Ignored the arguments 'nd' and 'eps' controlling the quadrature scheme.
	   Fixed.

    o   "[.linnet", "[.lpp"
	   In X[W] where W is a window, if a vertex of the network
	   lay exactly on the boundary of W, an edge of length zero was created.
	   Fixed.

    o   valid.ppm
	   Crashed sometimes when applied to the result of subfits().
	   Fixed.

    o   as.im.densityfun
	   Crashed if argument W was missing.
	   Fixed.

    o   as.linnet.linnet
	   This code could crash the R session, when sparse=FALSE, if there was
	   insufficient memory available to create the matrix of distances
	   between all pairs of network vertices.
	   Fixed.

    o   Summary.linim
	   A spurious warning was generated when the operation any() or all()
	   was applied to a logical-valued image on a network.
	   Fixed.

    o   "[<-.linim"
	   Crashed if the assignment would have replaced some existing NA values.
	   Fixed.

                 Changes in version 1.63-3 (2020-03-01)                 

OVERVIEW

    o   Minor changes for compatibility with future versions of R

    o   Minor improvements

    o   Version nickname: "Wet paint"

SIGNIFICANT USER-VISIBLE CHANGES

    o   plot.ppp
	   The coordinate axes will be plotted if axes=TRUE.
	   Axis labels xlab, ylab will be plotted if ann=TRUE.

                 Changes in version 1.63-2 (2020-02-23)                 

OVERVIEW

    o   Minor changes to satisfy the package checker.

    o   Version nickname: "I'm sorry Dave, I'm afraid I can't do that"

                       Changes in version 1.63-1                        

OVERVIEW

    o   Enhancement to plot.linim

    o   Fill missing pixel values by taking the nearest defined pixel value.

    o   Minor improvements and bug fixes.

    o   spatstat now requires spatstat.utils version 1.17-0.

    o   Version nickname: 'Made from recycled electrons'

NEW FUNCTIONS

    o   is.linim
	   Tests whether an object belongs to class 'linim'.

    o   nearestValue
	   Given a pixel image on a subset of a rectangle,
	   extend the image to the entire rectangle,
	   using the nearest well-defined pixel value.

SIGNIFICANT USER-VISIBLE CHANGES

    o   markconnect
	   Runs faster and handles much larger datasets.

    o   markvario
	   Runs faster and handles much larger datasets.

    o   markcorr, markconnect, markvario 
	   The 'weights' can now be an expression to be evaluated,
	   or a function, or a pixel image, as well as a numeric vector.

    o   Smooth.ppp
	   The 'weights' can now be an expression to be evaluated,
	   or a function, or a pixel image, as well as a numeric vector.

    o   rpoislpp
	   If 'lambda' is a list of 'linim' or 'linfun' objects, then
	   the argument L can be omitted.

    o   plot.linim
	   New argument 'fatten' improves visual appearance when style="colour".

    o   plot.im, plot.owin
	   The coordinate axes will be plotted if axes=TRUE.
	   Axis labels xlab, ylab will be plotted if ann=TRUE.

    o   bugfixes
	   If sincedate="all" or sinceversion="all", then all bugs will be listed.

    o   Jfox
	   New argument 'warn.trim' makes it possible to suppress repeated warnings.

    o   requireversion
	   New argument 'fatal'

BUG FIXES

    o   predict.rhohat, simulate.rhohat
	   When applied to a 'rhohat' object computed from
	   linear network data (lpp or lppm), there was a warning
	   about the lengths of vectors, and the results were incorrect.
	   Fixed.

    o   predict.rhohat, simulate.rhohat
	   Crashed when applied to a 'rhohat' object computed from *multitype* 
	   linear network data (multitype lpp or lppm).
	   Fixed.

    o   Jfox
	   envelope() commands using the summary function 'Jfox'
	   crashed sometimes with a message about illegal spacing of 'r' values.
	   Fixed.

    o   leverage, influence, dfbetas
	   Crashed when applied to an 'ippm' object in which
	   the irregular components of the score, but not the Hessian,
	   were provided by symbolic differentiation.
	   Fixed.

    o   parres
	   Crashed in rare circumstances, when the data did not contain
	   enough useable values to perform smoothing.
	   Fixed.

                 Changes in version 1.63-0 (2020-01-23)                 

OVERVIEW

    o   Compute minimum or maximum nearest-neighbour distance between
	   each pair of types in a multitype point pattern.

    o   Important bug fix in simulations of the multitype hard core process.

    o   Numerous improvements and bug fixes.

    o   Deprecated functions have been removed.

    o   Version nickname: "Trees in space"

SIGNIFICANT USER-VISIBLE CHANGES

    o   minnndist, maxnndist
	   New argument 'by' makes it possible to find the minimum or maximum
	   nearest neighbour distance between each pair of possible types
	   in a multitype pattern.

    o   beachcolours
	   If 'sealevel' lies outside 'srange', then 'srange' will be extended
	   to include it (without a warning).

    o   split<-.ppp
	   The default for argument 'un' in 'split<-.ppp' 
	   now agrees with the default for the same argument in 'split.ppp'.

    o   lineardisc
	   New argument 'add'.
	   Default plotting behaviour has changed.

    o   rmh, rmh.default
	   The printed output of the debugger (invoked by snoop=TRUE)
	   has been improved.

    o   plot.owin
	   New argument 'use.polypath' controls how to plot
	   a filled polygon when it has holes.

    o   plot.profilepl
	   This function has now been documented, and the graphics improved.

    o   erode.owin, dilate.owin
	   These deprecated functions have now been deleted
	   (replaced by erosion.owin and dilation.owin)

    o   delaunay.distance, delaunay.network
	   These deprecated functions have now been deleted
	   (replaced by delaunayDistance, delaunayNetwork)

    o   dirichlet.edges, dirichlet.network, dirichlet.vertices, dirichlet.weights
	   These deprecated functions have now been deleted
	   (replaced by dirichletEdges, dirichletNetwork,
	   dirichletVertices, dirichletWeights)

BUG FIXES

    o   rmh, simulate.ppm, MultiHard
	   Simulated realisations of the multitype hard core model
	   were completely incorrect (the interaction was effectively removed,
	   changing the model into a Poisson process).
	   Fixed.

    o   kppm, AIC
	   For kppm models fitted with method='clik2', the resulting value of logLik()
	   was equal to 1/2 of the correct value. This would have affected
	   model comparison using AIC, and model selection using step().
	   Fixed.

    o   hyperframe
	   Did not correctly handle date-time values (columns of class 'Date', etc).
	   Fixed

    o   rlpp
	   The resulting pattern was unmarked even when it should have been multitype.
	   Fixed.

    o   idw
	   Estimates were zero if 'se=TRUE' and 'power != 2' and 'at="pixels"'.
	   Fixed.

    o   model.matrix.mppm
	   Sometimes returned a matrix with the wrong number of rows.
	   Fixed.

    o   nncross.ppp
	   Format of output was incorrect if X was an empty pattern.
	   Fixed.

    o   rmh, rmh.default
	   For a marked point process, the debugger did not display the marks.
	   (The rmh debugger is invoked by calling rmh with snoop=TRUE).
	   Fixed.

    o   pairs.im, pairs.linim
	   The argument 'labels' was sometimes ignored.
	   Fixed.

    o   as.im.data.frame
	   Results were incorrect for factor-valued data.
	   Fixed.

    o   relrisk.ppp
	   Crashed if there were more than 2 types of points
	   and method = "leastsquares" or "weightedleastsquares".
	   Fixed.

    o   as.im.nnfun
	   Crashed when applied to a function generated by nnfun.psp.
	   Fixed.

    o   diagnose.ppm
	   Crashed for some models with an error message from 'beachcolours'.
	   Fixed.

    o   predict.rho2hat
	   Crashed if one of the original covariates was a function
	   rather than an image.
	   Fixed.

    o   lineardisc
	   Crashed in some graphics environments.
	   Fixed.

    o   lineardisc
	   Crashed if the network segments had marks.
	   Fixed.

    o   rmh
	   Crashed for multitype models if 'nsave' was specified.
	   Fixed.

    o   vcov.mppm, simulate.mppm
	   Crashed for multitype models with a hardcore interaction component.
	   Fixed.

    o   effectfun
	   Crashed if 'covname' was not the name of a covariate appearing in
	   the model and was not one of the reserved names 'x', 'y', 'marks'.
	   Fixed.

                 Changes in version 1.62-2 (2019-12-10)                 

OVERVIEW

    o   Urgent bug fixes and workarounds.

    o   Version nickname: "Shape-shifting lizard"

SIGNIFICANT USER-VISIBLE CHANGES

    o   colourmap
	   Argument 'col' is now permitted to have length 1, representing
	   a colour map in which all values are mapped to the same colour.

    o   lut
	   Argument 'outputs' is now permitted to have length 1, representing
	   a lookup table in which all inputs are mapped to the same output value.

BUG FIXES

    o   envelope
	   Crashed sometimes, with a message about unrecognised arguments,
	   when applied to a summary function created by the user.
	   Fixed.

                       Changes in version 1.62-1                        

OVERVIEW

    o   We thank Mohammad Ghorbani, Ute Hahn, Abdollah Jalilian, Nestor Luambua,
	   Greg McSwiggan, Annie Mollie and Jakob Gulddahl Rasmussen for contributions.

    o   spatstat now requires spatstat.utils version 1.15-0
	   and goftest version 1.2-2.

    o   Nearest Neighbour Index function can now return mark values.

    o   Important fix in Ripley isotropic correction.

    o   Index of repulsion strength for determinantal point process models.

    o   Nearest neighbours between two point patterns in any number of dimensions.

    o   More options for handling bad simulation outcomes in envelope().

    o   Bandwidth selectors warn about extreme values of bandwidth.

    o   Tessellations on a linear network can now have marks.

    o   New functions for simulating point processes on a linear network.

    o   More functions for manipulating tessellations on a linear network.

    o   mppm accepts case weights.

    o   Bug fixes and minor improvements.

    o   Nickname: 'An update which will live in infamy'

NEW FUNCTIONS

    o   repul
	   Repulsiveness index for a determinantal point process model.

    o   reach.kppm
	   Reach (interaction distance) for a Cox or cluster point process model.

    o   summary.dppm, print.summary.dppm
	   Summary method for determinantal point process models.

    o   nncross.ppx
	   Nearest neighbours between two point patterns in any number of dimensions.

    o   uniquemap.matrix
	   Method for uniquemap for matrices.

    o   repairNetwork
	   Detect and repair inconsistencies in internal data
	   in a linnet or lpp object.

    o   marks<-.lintess, unmark.lintess
	   Assign marks to the tiles of a tessellation on a linear network.

    o   marks.lintess
	   Extract the marks of the tiles of a tessellation on a linear network.

    o   tilenames.lintess
	   Extract the names of the tiles in a tessellation on a linear network

    o   tilenames<-.lintess
	   Change the names of the tiles in a tessellation on a linear network

    o   nobjects.lintess
	   Count the number of tiles in a tessellation on a linear network

    o   as.data.frame.lintess
	   Convert a tessellation on a linear network into a data frame.

    o   rcelllpp
	   Simulate the cell point process on a linear network

    o   rSwitzerlpp
	   Simulate the Switzer-type point process on a linear network

    o   intersect.lintess
	   Form the intersection of two tessellations on a linear network

    o   chop.linnet
	   Divide a linear network into tiles using infinite lines

SIGNIFICANT USER-VISIBLE CHANGES

    o   lintess
	   New argument 'marks'
	   Tessellations can now have marks.

    o   tilenames, tilenames<-
	   These functions are now generic, with methods for 'tess' and 'lintess'

    o   mppm
	   New argument 'weights' specifies case weights for each row of data.

    o   unstack.lintess
	   Now handles marks.

    o   plot.lintess
	   Modified to display the marks attached to the tiles.
	   Changed options: style=c("colour", "width", "image").

    o   as.linfun.lintess
	   The default function values are the marks.

    o   print.lintess, summary.lintess, print.summary.lintess
	   Output now includes information about marks.

    o   nnfun.ppp, nnfun.psp, nnfun.lpp
	   New argument 'value' specifies whether to return the index of the
	   nearest neighbour or the mark value of the nearest neighbour.

    o   envelope.ppp, envelope.ppm, envelope.kppm, envelope.pp3
	   New arguments 'rejectNA' and 'silent'.

    o   envelope.lpp, envelope.lppm
	   New arguments 'maxnerr', 'rejectNA' and 'silent'.

    o   plot.psp
	   New argument 'col' gives control over the colour map
	   representing the values of marks attached to the segments.

    o   plot.im
	   Some warnings are suppressed when do.plot=FALSE.

    o   plot.linim
	   New explicit argument 'box' determines whether to plot a bounding box.
	   Default is now FALSE in all cases.

    o   Kest, Kinhom, pcf, pcfinhom, edge.Ripley
	   Calculation of isotropic edge correction for polygonal windows
	   has changed slightly. Results are believed to be more accurate.
	   Computation has been accelerated by about 20 percent in typical cases.

    o   bw.diggle, bw.ppl, bw.lppl, bw.pcf, bw.CvL, bw.voronoi
	   A warning is issued if the optimal value of the cross-validation criterion
	   occurs at an endpoint of the search interval.
	   New argument 'warn'.

    o   mad.test, dclf.test, dg.test, bits.test
	   Function values which are infinite, NA or NaN are now ignored
	   in the calculation (with a warning) instead of causing an error.
	   Warning messages are more detailed.

    o   rmhcontrol, rmh
	   The parameter 'nsave' can now be a vector of integers.

    o   diagnose.ppm
	   Accelerated, when type="inverse", for models without a hard core.

    o   uniquemap.data.frame
	   Accelerated for some cases.

    o   vcov.ppm, vcov.mppm
	   New argument 'nacoef.action' specifies what to do if
	   some of the fitted coefficients are NA, NaN or Inf.

    o   Lest, Linhom, Ldot, Lcross, Ldot.inhom, Lcross.inhom
	   These summary functions now have an explicit argument 'correction'.
	   Behaviour is unchanged.

    o   bugfixes
	   Arguments sinceversion="book" or sincedate="book"
	   are interpreted to give all bugs reported after publication
	   of the spatstat book.

    o   cbind.hyperframe, rbind.hyperframe
	   The result now retains the row.names of the original arguments.

    o   print.summary.owin
	   More information is printed.

    o   append.psp
	   Arguments may be NULL.

    o   as.psp
	   Now permits a data frame of marks to have only one column,
	   instead of coercing it to a vector.

BUG FIXES

    o   as.linnet.psp
	   Sometimes produced a network with duplicated segments.
	   [Such objects can be repaired using 'repairNetwork'.]
	   Fixed.

    o   edge.Ripley, Kest, Kinhom
	   Isotropic correction weights for polygonal windows were sometimes incorrect
	   for small radius 'r' if the polygon contained many small segments
	   [spotted by Annie Mollie] or if the polygon was very long and thin
	   [spotted by Nestor Luambua]. Problem arose in spatstat 1.60-0.
	   Fixed.

    o   lppm
	   Did not correctly handle the case where the left-hand side of the formula
	   is the name of an entry in the 'data' argument.
	   Fixed.

    o   plot.lpp
	   Did not correctly handle the argument 'which.marks'.
	   Fixed.

    o   plot.im
	   Did not correctly handle the argument 'ribargs$at'.
	   Fixed.

    o   density.lpp
	   Sometimes requested a larger value of 'iterMax' but ignored it.
	   Fixed.

    o   [.linnet, [.lpp
	   Crashed if x contained inconsistent internal data
	   (when index 'j' was a window, and snip=TRUE).
	   Fixed.

    o   plot.linim 
	   Crashed if the pixel values were complex numbers.
	   Fixed.

    o   plot.linfun
	   Crashed if the function values were complex numbers.
	   Fixed.

    o   integral.linim, mean.linim
	   Crashed if the image had logical values.
	   Fixed.

    o   Re, Im, Arg, Mod, Conj
	   For pixel images on a linear network (class 'linim')
	   these operations crashed if the pixel values were complex numbers.

    o   studpermu.test
	   Crashed if the hyperframe was very large.
	   Fixed.

    o   studpermu.test
	   Crashed in some cases when the simulated functions were
	   incompatible with each other, due to the use of different edge
	   corrections.
	   Fixed.

    o   vcov.ppm, print.ppm, summary.ppm
	   Crashed in some cases if the fitted coefficients were NA.
	   Fixed.

    o   quantess.owin, quantess.ppp, quantess.im
	   Crashed in some cases because the tile labels were not unique.
	   Fixed.

    o   plot.pp3
	   Did not correctly handle graphical arguments ('col', 'pch', 'cex')
	   if they were vectors [Spotted by Abdollah Jalilian].
	   Fixed.

    o   shift.linnet
	   Generated a spurious warning.
	   Fixed.

    o   density.lpp, lixellate
	   Crashed in some cases when a data point was exactly at a vertex.
	   [Spotted by Jakob Gulddahl Rasmussen.]
	   Fixed.

    o   plot.linim
	   Crashed (when style="width") if any pixel values were NaN.
	   Fixed.

    o   Fest, Jest, Jdot, Jcross, Hest, Iest, rectcontact
	   envelope() commands using one of these summary functions
	   crashed sometimes with a message about illegal spacing of 'r' values.
	   Fixed.

    o   plot.linnet, plot.psp
	   Ignored argument 'col' when style="width".
	   Fixed.

    o   rshift.psp
	   Crashed if X had a data frame of marks.
	   [Spotted by Ute Hahn.]
	   Fixed.

    o   Kscaled
	   Crashed if Ripley's isotropic edge correction was selected
	   but the translation edge correction was not.
	   Fixed.

                 Changes in version 1.61-0 (2019-09-22)                 

OVERVIEW

    o   We thank Jordan Brown, Tilman Davies and Greg McSwiggan for contributions.

    o   Fast kernel estimation on a linear network using 2D kernels.

    o   Nonparametric maximum likelihood estimation of 'rho'.

    o   Extension of Scott's rule for bandwidth selection.

    o   Cross-validated bandwidth selection on a linear network.

    o   More support for character-valued images.

    o   Random thinning of clumps.

    o   Bug fixes and minor improvements.

    o   Nickname: 'Puppy zoomies'

NEW FUNCTIONS

    o   densityQuick.lpp
	   Fast kernel estimator of point process intensity on a network
	   using 2D smoothing kernel.

    o   bw.scott.iso
	   Isotropic version of Scott's rule (for point patterns in any dimension).

    o   data.lppm
	   Extract the original data point pattern from a fitted model of class 'lppm'.

    o   rthinclumps
	   Divide a spatial region into clumps and randomly delete some of them.

    o   dimnames.hyperframe, dimnames<-.hyperframe
	   Methods for extracting and changing the 'dimnames' of a hyperframe.

SIGNIFICANT USER-VISIBLE CHANGES

    o   rhohat
	   Estimation by nonparametric maximum likelihood is now supported,
	   assuming the intensity is a monotone function of the covariate.
	   New options: smoother="increasing" and smoother="decreasing".

    o   density.lpp
	   New argument 'distance' offers a choice of different kernel methods.

    o   bw.scott
	   Now handles point patterns of any dimension.
	   New arguments 'isotropic' and 'd'.

    o   bw.ppl
	   New argument 'shortcut' allows faster computation.
	   Additional arguments '...' are now passed to density.ppp.

    o   [<-.im
	   New argument 'drop' controls behaviour when indices are missing
	   as in 'x[] <- value'

    o   mppm
	   Now supports 'self-starting' interactions.

    o   as.im
	   New argument 'stringsAsFactors' is recognised by many methods.
	   It enables the creation of character-string-valued images.

    o   plot.im
	   Axes are now prevented from extending outside the image rectangle.

    o   plot.im
	   New argument 'zap'.

    o   blur
	   New argument 'kernel'.

    o   Smooth.im
	   New argument 'kernel'.

    o   quadrat.test
	   New argument 'df.est'.

    o   edge.Ripley
	   Numerical stability has been improved on some platforms.
	   Results may have changed in marginal cases (e.g. where the circle
	   of radius r centred at X is tangent to an edge of the polygonal window). 

    o   rownames, rownames<-, colnames, colnames<-
	   These operations now work for hyperframes.

    o   quadrat.test
	   Improved labelling of test when argument 'CR' is given.

    o   plot.pppmatching
	   This existing function now has a help file.
	   New argument 'adjust'.

    o   solist, is.sob, lintess
	   Objects of class 'lintess' are now recognised as 2D spatial objects
	   for the purposes of solist() and is.sob().

    o   as.linfun.lintess
	   Functions created by as.linfun.lintess() now generate better output
	   when the function is printed.

BUG FIXES

    o   densityVoronoi.lpp
	   Did not correctly handle patterns containing duplicated points.
	   Fixed.

    o   quadrat.test
	   Argument 'CR' was ignored when method="MonteCarlo".
	   Fixed.

    o   localKcross.inhom, localLcross.inhom
	   Argument lambdaX was ignored.
	   Fixed.

    o   "[.linim"
	   Factor values were erroneously converted to integers, in some cases.
	   Fixed.

    o   "[<-.hyperframe"
	   Did not handle some classes of objects correctly.
	   Fixed.

    o   effectfun
	   In a multitype point process model, effectfun() ignored any
	   user-specified value of 'marks'.
	   Fixed.

    o   as.linim.linfun
	   Additional arguments (other than spatial coordinates) were ignored.
	   Fixed.

    o   plot.solist
	   Display output was mangled if one entry in the list was
	   an object that would normally generate multiple panels of graphics,
	   such as an 'lpp' or 'tess' object with multiple columns of marks,
	   or a marked 'msr', 'leverage.ppm' or 'influence.ppm' object.
	   Fixed.

    o   plot.lpp
	   Return value was mangled when x had multiple columns of marks.
	   Fixed.

    o   colourtable
	   Crashed in some cases when 'breaks' was given.
	   Fixed.

    o   rLGCP
	   Crashed if 'win' was not a rectangle and 'mu' was not a constant.
	   Fixed.

    o   intersect.tess
	   Crashed if 'Y' was a window object and 'keepmarks=TRUE'.
	   Fixed.

    o   envelope.lppm
	   Crashed if argument 'simulate' was given.
	   Fixed.

    o   unstack.solist
	   Did not correctly handle objects of class 'lintess'.

    o   unstack.solist
	   Did not correctly handle objects of class 'tess' if they had multiple
	   columns of marks.

    o   plot.pppmatching
	   Issued spurious warnings about unrecognised plot arguments.
	   Fixed.

    o   plot.lintess
	   Issued spurious warnings about unrecognised plot arguments.
	   Fixed.

    o   shift.lpp, rotate.lpp
	   Issued spurious warnings if argument 'origin' was given.
	   Fixed.

                 Changes in version 1.60-1 (2019-06-23)                 

OVERVIEW

    o   Version number incremented for administrative reasons.

                       Changes in version 1.60-0                        

OVERVIEW

    o   We thank Ottmar Cronie, Tilman Davies, Andrew Hardegen,
	   Tom Lawrence, Robin Milne, Mehdi Moradi, Gopalan Nair,
	   Tim Pollington and Suman Rakshit for contributions.

    o   Random thinning and random labelling of spatial patterns
	   extended to different types of pattern.

    o   Confidence intervals for multitype K functions.

    o   Envelopes for balanced two-stage test

    o   Accelerated some code.

    o   Minor bug fixes and improvements.

    o   Package built under R 3.6.0.

    o   Version nickname: 'Swinging Sixties'

NEW FUNCTIONS

    o   bits.envelope
	   Global simulation envelope corresponding to bits.test,
	   the balanced independent two-stage Monte Carlo test.

    o   extrapolate.psp
	   Extrapolate line segments to obtain infinite lines.

    o   uniquemap
	   Map duplicate points to unique representatives.
	   Generic with methods for ppp, lpp, ppx

    o   uniquemap.data.frame
	   Map duplicate rows to unique representatives

    o   localKcross, localLcross, localKdot, localLdot,
	   localKcross.inhom, localLcross.inhom
	   Multitype local K functions.

SIGNIFICANT USER-VISIBLE CHANGES

    o   lohboot
	   Now works for multitype K functions Kcross, Kdot, Lcross, Ldot,
	   Kcross.inhom, Lcross.inhom.

    o   Kinhom, pcfinhom
	   Leave-one-out calculation is implemented when 'lambda' is a fitted model
	   of class 'dppm'.

    o   Kcross.inhom, Kdot.inhom, Lcross.inhom, Ldot.inhom
	   Leave-one-out calculation is implemented when 'lambdaX' is a fitted model
	   of class 'dppm'.

    o   rthin, rlabel
	   These functions now work on point patterns of all classes
	   (ppp, lpp, pp3, ppx) and line segment patterns (psp).

    o   bw.abram
	   New argument 'smoother' determines how the pilot estimate is computed.
	   Formal arguments rearranged. 

    o   plot.im
	   New argument 'riblab'.

    o   rlabel
	   New arguments 'nsim' and 'drop'.

    o   localK, localKinhom
	   New argument 'rmax'.

    o   rLGCP
	   Accelerated.

    o   anyDuplicated.ppp
	   Accelerated.

    o   duplicated.ppp
	   Accelerated, in most cases.

    o   simulate.kppm
	   Accelerated, for LGCP models. 

    o   predict.ppm
	   Accelerated, for models fitted with method="VBlogi"

    o   print.rmhmodel
	   Output improved.

BUG FIXES

    o   plot.linim, plot.linfun
	   Not all the entries of 'leg.args' were passed to text.default.
	   Fixed.

    o   densityVoronoi.ppp
	   Did not correctly handle patterns containing duplicated points.
	   Fixed.

    o   markcorr
	   The argument 'correction="none"' did not generate any results.
	   [Spotted by Tim Pollington.]
	   Fixed.

    o   names<-.fv
	   Did not adjust the plotting formula, so that a subsequent call to plot.fv
	   would complain about missing variables.
	   Fixed.

    o   im.apply
	   Crashed if 'FUN' returned factor values.
	   Fixed.

    o   stienenSet
	   Crashed if the data contained duplicated points.
	   Fixed.

    o   predict.ppm, effectfun
	   Crashed in some cases, with the message 'ncol(x)=nrow(v) is not TRUE'.
	   Fixed.

    o   parres
	   Crashed in some cases, with the message 'logical subscript too long'.
	   Fixed.

    o   dclf.test, mad.test, dg.test, bits.test
	   Crashed in some cases if the summary function values were infinite or NA.
	   Fixed.

                 Changes in version 1.59-0 (2019-03-22)                 

OVERVIEW

    o   We thank Lucia Cobo Sanchez, Tilman Davies, Maximilian Hesselbarth,
	   Kassel Hingee, Mehdi Moradi, Suman Rakshit, Jan Sulavik
	   and Luke Yates for contributions.

    o   Extensions to adaptive intensity estimators.

    o   'Dartboard' tessellation using polar coordinates.

    o   Performance improvements.

    o   Minor improvements and bug fixes.

    o   Version nickname: "J'ai omis les oeufs de caille"

NEW FUNCTIONS

    o   polartess
	   Tessellation using polar coordinates.

    o   bw.abram
	   Variable bandwidths for adaptive smoothing, using Abramson's Rule.

    o   densityAdaptiveKernel
	   Calculates adaptive estimate of point process intensity
	   using variable-bandwidth kernel estimation.

    o   densityVoronoi, densityVoronoi.ppp
	   Calculates adaptive estimate of point process intensity
	   using tessellation methods. This is an extension of the
	   old function adaptive.density.

    o   densityVoronoi.lpp
	   Voronoi or smoothed Voronoi estimator of intensity
	   for point pattern on a linear network.

    o   coords.quad
	   New method for 'coords', to extract the coordinates of the points
	   in a quadrature scheme.

    o   lineartileindex
	   Low-level function to classify points on a linear network
	   according to which tile of a tessellation they fall inside.

SIGNIFICANT USER-VISIBLE CHANGES

    o   latest.news
	   Now prints news documentation for the current major version, by default.
	   New argument 'major'.

    o   quantess
	   The covariate Z can now be "rad" or "ang" representing polar coordinates.
	   New argument 'origin' specifies the origin of polar coordinates.
	   New argument 'eps' controls accuracy of calculation.

    o   envelope
	   The argument 'simulate' can now be a function (such as 'rlabel').
	   The function will be applied repeatedly to the original data Y,
	   and should yield point patterns of the same kind.

    o   adaptive.density
	   This function can now perform adaptive estimation by two methods: either
	   tessellation-based methods or variable-bandwidth kernel estimation.
	   The calculations are performed by either 'densityVoronoi' or
	   'densityAdaptiveKernel'.

    o   densityVoronoi
	   This performs the calculations of the old function 'adaptive.density'.
	   New argument 'fixed' specifies the subsampling.
	   New argument 'method' allows a choice between the original algorithm
	   and the recently described 'smoothed Voronoi' estimator.
	   Default value of 'f' changed to 'f=1'.

    o   pcf.ppp
	   Now accepts correction="none".

    o   pairorient
	   Default edge corrections now include 'bord.modif'.

    o   funxy
	   Functions of class 'funxy' can now be applied to quadrature schemes.

    o   lohboot
	   Computation accelerated when the window is a rectangle.

    o   nncorr, nnmean, nnvario
	   New argument 'na.action'.

    o   pp3
	   New argument 'marks'.

    o   clusterfit
	   New argument 'verbose'.

    o   beachcolours, beachcolourmap
	   Improved positioning of the yellow colour band.

    o   linearK, linearpcf, linearKdot, linearKcross, linearpcfcross, linearpcfdot
	   Computation accelerated for networks which are not connected.

    o   as.linnet.psp
	   Computation accelerated.

    o   as.linfun.lintess
	   Computation accelerated.

    o   selfcut.psp
	   Computation accelerated.
	   The result now has an attribute "camefrom"
	   indicating the provenance of each segment in the result.

    o   bw.stoyan
	   The rule has been modified so that, if the pattern is empty,
	   it is now treated as if it contained 1 point,
	   so that a finite bandwidth value is returned.

    o   rebound.owin
	   Now preserves unitnames of the objects.

    o   rescale.owin, rescale.ppp, rescale.psp
	   The geometrical type of the window is now preserved in all cases
	   (previously if the window was polygonal but was equivalent to a rectangle,
	   the rescaled window was a rectangle).

    o   shift.im, shift.owin, shift.ppp, shift.psp
	   More options for the argument 'origin'.

    o   nnwhich.ppp, nnwhich.default
	   Accelerated, in the case k > 1.

    o   is.subset.owin
	   Improved robustness against numerical error.

    o   plot.im
	   Improved behaviour when the pixel values are almost constant.

    o   Finhom, Ginhom, Jinhom
	   A warning is issued if bias is likely to occur because of undersmoothing.
	   New arguments 'warn.bias' and 'savelambda'.

    o   plot.colourmap
	   Now handles a colourmap defined on an interval of length zero.

    o   ewcdf
	   Computation accelerated.
	   New arguments 'normalise' and 'adjust'.
	   The result does not inherit class 'ecdf' if normalise=FALSE.

    o   spatialcdf
	   Computation accelerated.
	   The result does not inherit class 'ecdf' if normalise=FALSE.

    o   effectfun
	   New argument 'nvalues'.

    o   parres
	   The argument 'covariate' may be omitted if the model involves
	   only one covariate.

    o   alltypes
	   If 'envelope=TRUE' and the envelope computation reaches the
	   maximum permitted number of errors (maxnerr) in evaluating
	   the summary function for the simulated patterns, then instead
	   of triggering a fatal error, the envelope limits will be set to NA.

    o   simulate.kppm
	   Additional arguments '...' are now passed to
	   the function that performs the simulation.

BUG FIXES

    o   spatialcdf
	   The argument 'weights' was ignored in some cases.
	   Fixed.

    o   ppp
	   Points inside the window were erroneously rejected as lying outside
	   the window, if the window was a polygon equivalent to a rectangle
	   with sides longer than 10^6 units.
	   Fixed.

    o   inside.owin
	   All results were FALSE if the window was
	   a polygon equivalent to a rectangle
	   with sides longer than 10^6 units.
	   Fixed.

    o   sumouter
	   Result was incorrect (all entries were zero)
	   if 'w' was missing and 'y' was given.
	   Fixed.

    o   extractbranch.lpp
	   Point pattern coordinates were sometimes erroneously set to NA.
	   Fixed.

    o   beachcolours, beachcolourmap
	   The number of colours was not always equal to 'ncolours'.
	   [Spotted by Tilman Davies.]
	   Fixed.

    o   is.subset.owin
	   Sometimes gave the wrong answer for polygonal windows
	   due to numerical rounding error.
	   Fixed.

    o   update.kppm
	   Crashed if the updating information was a point pattern
	   and the original model call did not include a formula.
	   Spotted by Luke Yates.
	   Fixed.

    o   incircle, inpoint
	   Crashed if the window was extremely thin.
	   Fixed.

    o   effectfun
	   Crashed in some obscure cases.
	   Fixed.

    o   closepairs.pp3
	   Crashed if distinct=FALSE and what="all".
	   Fixed.

    o   update.ippm
	   Crashed if the model was fitted using method="logi".
	   Fixed.

    o   plot.msr
	   Crashed sometimes if x was multitype and multiplot=FALSE.
	   Fixed.

    o   anova.mppm
	   Crashed if applied to a single model, unless the current environment
	   was the global environment.
	   Fixed.

    o   lurking.mppm
	   If 'covariate' was a list of images, the code crashed sometimes
	   with message 'Fisher information is singular'.
	   Fixed.

    o   im
	   Crashed if 'mat' was a 1-dimensional table (class 'table').
	   Fixed.

    o   dirichlet
	   Crashed if the pattern was empty or contained only 1 point.
	   Fixed.

    o   rjitter
	   Crashed if the pattern contained 0 or 1 points and
	   the argument 'radius' was not specified.
	   Fixed.

    o   quantess.owin
	   Crashed if Z was a function(x,y).
	   Fixed.

    o   quadrat.test
	   The p-value was NA if one of the observed counts was zero,
	   for the Cressie-Read tests with CR not equal to 1 or -1.
	   Fixed.

    o   quadratcount.ppp
	   Sometimes issued an incorrect warning that data points were
	   outside the tessellation, when 'tess' was a tessellation
	   represented by a pixel image.
	   Fixed.

    o   as.linim.linfun
	   Factor-valued functions were converted to integer-valued images.
	   Spotted by Suman Rakshit.
	   Fixed.

    o   plot.linfun
	   Did not display factor-valued functions correctly.
	   Spotted by Suman Rakshit.
	   Fixed.

    o   dclf.test, mad.test
	   Crashed, in rare cases, when applied to an 'envelope' object.
	   Spotted by Jan Sulavik.
	   Fixed.

    o   plot.spatialcdf, plot.ewcdf
	   A horizontal line was plotted at height 1, even if the CDF was unnormalised.
	   Fixed.

    o   plot.tess
	   The names of the tiles were sometimes re-ordered in the legend.
	   Fixed.

    o   rThomas, rMatClust, rCauchy, rVarGamma
	   If the simulation window was not a rectangle,
	   the attribute 'Lambda' was a numeric vector, rather than a pixel image.
	   Fixed.

                 Changes in version 1.58-2 (2019-01-10)                 

OVERVIEW

    o   Venn diagram tessellation

    o   Internal bug fixes.

NEW FUNCTIONS

    o   venn.tess
	   Venn diagram tessellation.

                       Changes in version 1.58-1                        

OVERVIEW

    o   Bug fixes.

    o   Version nickname: "Compliment Sandwich"

BUG FIXES

    o   lpp
	   Did not correctly detect some situations where the input data are invalid.
	   Fixed.

    o   lurking.ppp, lurking.ppm
	   Did not correctly detect some situations where the input data are invalid.
	   Fixed.

                       Changes in version 1.58-0                        

OVERVIEW

    o   We thank Andrew Bevan, Hamidreza Heydarian and Andrew P Webster
	   for contributions.

    o   Mark-mark scatter plot.

    o   Standard error calculation for inverse-distance weighting

    o   Minor improvements and extensions.

    o   Version nickname: 'Drop Bear'

NEW FUNCTIONS

    o   markmarkscatter
	   Mark-mark scatterplot

SIGNIFICANT USER-VISIBLE CHANGES

    o   idw
	   Standard errors can now be calculated by setting 'se=TRUE'.

    o   im.apply
	   Computation accelerated, especially when NA's are absent.
	   New arguments 'fun.handles.na' and 'check'.

    o   kppm, dppm, clusterfit
	   Changed precedence rule for handling the algorithm parameters
	   in the minimum contrast algorithm. Individually-named arguments
	   'q,p,rmax,rmin' now take precedence over entries
	   with the same names in the list 'ctrl'.

    o   rotmean
	   Improved algorithm stability

    o   summary.kppm
	   Prints more information about algorithm convergence.

    o   closepairs.pp3, crosspairs.pp3
	   Argument 'what' can take the value "ijd"

    o   plot.onearrow
	   Graphical parameters, specified when the object was created,
	   are now taken as the defaults for graphical parameters to the plot.

BUG FIXES

    o   rotmean
	   When result="im" the resulting image did not have the same dimensions
	   as the input. [Spotted by Hamidreza Heydarian.]
	   Fixed.

    o   rotmean
	   If argument 'origin' was given, and if result="im" was specified,
	   the resulting image was wrongly displaced.
	   Fixed.

    o   runifpointx
	   Result was mangled when n=0 or n=1.
	   Fixed.

                 Changes in version 1.57-1 (2018-11-04)                 

OVERVIEW

    o   Bug fixes.

    o   Version nickname: 'Cartoon Physics'

BUG FIXES

    o   multiplicity.default
	   Some entries of the result were incorrectly set to 1.
	   Fixed.

    o   anova.ppm
	   Crashed if adjust=TRUE and the models were fitted with use.gam=TRUE.
	   Fixed.

                       Changes in version 1.57-0                        

OVERVIEW

    o   We thank Corey Anderson, Ryan Arellano, Hadrien Commenges,
	   Ottmar Cronie, Tilman Davies, Maximilian Hesselbarth, Kassel Hingee,
	   Tomas Lazauskas, Marie-Colette van Lieshout, Rasmus Waagepetersen
	   and 'daitakahashi' for contributions.

    o   Cronie-van Lieshout bandwidth selection.

    o   Smoothing functions handle non-Gaussian kernels.

    o   Infinite smoothing bandwidths permitted.

    o   Positive confidence limits for rhohat.

    o   Improved bivariate interpolation.

    o   subset() method for line segment patterns.

    o   Important bug fixes in rthin and density.ppp

    o   Minor bug fixes and improvements.

    o   Version nickname: 'Zombie apocalypse'

NEW FUNCTIONS

    o   bw.CvL
	   Cronie-Van Lieshout bandwidth selection for density estimation.
	   [Contributed by Ottmar Cronie and Marie-Colette van Lieshout.]

    o   subset.psp
	   Method for 'subset' for line segment patterns.

SIGNIFICANT USER-VISIBLE CHANGES

    o   densityfun.ppp, Smoothfun.ppp, Smooth.ppp
	   These commands now handle non-Gaussian kernels.

    o   density.ppp, relrisk.ppp, Smooth.ppp, densityfun.ppp, Smoothfun.ppp
	   Argument 'sigma' can be infinite.

    o   interp.im
	   New argument 'bilinear' specifies the choice of interpolation rule.

    o   rhohat
	   Methods for rhohat have a new argument 'positiveCI'
	   specifying whether confidence limits should be positive.

    o   plot.colourmap
	   New argument 'increasing' specifies whether the colours are
	   displayed in order left-to-right/bottom-to-top.
	   Changed default behaviour for discrete colour maps when vertical=FALSE.

    o   split.ppx
	   Argument 'f' can be a logical vector.

    o   relrisk.ppp
	   If se=TRUE and at="pixels", the result belongs to class 'solist'.

    o   imcov, setcov, convolve.im
	   The name of the unit of length is preserved.

    o   density.ppp
	   Slightly accelerated for non-Gaussian kernels.

    o   bw.scott
	   The two bandwidth values in the result
	   now have names ('sigma.x' and 'sigma.y').

    o   pairdist.default
	   Now checks whether the data are valid 2-dimensional coordinates.

    o   pixellate.ppp
	   New argument 'savemap'

    o   rtemper
	   New argument 'track'.
	   Code runs slightly faster.

    o   eval.im, eval.linim
	   New argument 'warn'.

    o   Kres, Kcom, Gcom, psstG
	   If any of the calculated weights for the summary function
	   are infinite or NA, they are reset to zero, with a warning,
	   instead of a fatal error.

BUG FIXES

    o   rthin
	   If P was close to 1, the result was sometimes an empty point pattern
	   when it should have been identical to X.
	   [Spotted by Maximilian Hesselbarth.]
	   Fixed.

    o   density.ppp
	   Standard error calculations were incorrect
	   when sigma was a single numeric value.
	   The output was equal to 'sqrt(sigma)' times the correct answer.
	   Fixed.

    o   density.ppp
	   Result was incorrect for non-Gaussian kernels when
	   at="points" and leaveoneout=FALSE.
	   Fixed.

    o   density.ppp
	   Did not pass additional arguments "..." to a user-supplied
	   kernel function, in some cases.
	   Fixed.

    o   as.im.function, as.im.funxy
	   If the function values were factor values and the window was
	   not a rectangle, the result was an image with all pixel values NA.
	   [Spotted by Corey Anderson.]
	   Fixed.

    o   plot.funxy
	   If the function values were factor values and the window was
	   not a rectangle, the plot was empty.
	   [Spotted by Corey Anderson.]
	   Fixed.

    o   nnorient
	   Crashed if the border correction did not retain any data points.
	   [Spotted by Tomas Lazauskas.]
	   Fixed.

    o   linim
	   Crashed in some cases with a message about unitnames.
	   Fixed.

    o   density.lpp
	   Default value of 'dx' was sometimes incorrect.
	   Fixed.

    o   rMatClust, rThomas, rCauchy, rVarGamma
	   Issued a spurious warning about bandwidth selection
	   when saveLambda=TRUE.
	   Fixed.

    o   density.ppp
	   Issued a spurious warning about bandwidth selection
	   when 'kernel' was a user-supplied function.
	   Fixed.

    o   clusterfield.function
	   Issued a spurious warning about bandwidth selection.
	   Fixed.

    o   relrisk.ppp
	  Issued a spurious warning if the argument 'case' or 'control'
	  was given, for a bivariate point pattern.
	  Fixed.

    o   superimpose.ppp
	  If 'W' was a character string or function, the behaviour was
	  not exactly as described in the help file. 
	  Fixed.

    o   plot.psp
	  If the marks were factor values, the colour map was displayed upside down.
	  Fixed.

    o   eval.fv
	  If one of the 'fv' objects included ratio information (class 'rat')
	  then this was erroneously retained, in some cases.
	  Fixed.

    o   linearKcross
	  Crashed (with a message about a missing value of 'correction')
	  if there were no pairs of points to count.
	  Fixed.

    o   envelope.lpp
	  Crashed (randomly) when fix.n=TRUE and fix.marks=TRUE.
	  Fixed.

                 Changes in version 1.56-1 (2018-08-01)                 

OVERVIEW

    o   We thank Agustin Lobo for contributions.

    o   Improvements to infrastructure.

    o   Bug fixes.

    o   Version nickname: "Invisible Friend"

NEW FUNCTIONS

    o   as.im.expression
	   New method for 'as.im' for expressions.

    o   flipxy.tess
	   Method for 'flipxy' for tessellations.

SIGNIFICANT USER-VISIBLE CHANGES

    o   sdr
	   This is now a generic function, with a method for class 'ppp'.

    o   pointsOnLines
	   The result now has an attribute named "map"
	   which maps each point to its parent line segment.

    o   summary.lpp
	   Improved output.

    o   intersect.owin
	   Argument 'fatal' now defaults to FALSE.

    o   quadrature schemes (class "quad" and "logiquad")
	   Improved print and summary methods.

BUG FIXES

    o   cut.lpp
	   Crashed if the marks were a data frame or hyperframe.
	   Fixed.

    o   summary.lpp, print.summary.lpp
	   Output was garbled if the marks were a data frame or hyperframe.
	   Fixed.

    o   integral.linim
	   Crashed if the function had NA values.
	   Fixed.

    o   Tstat
	   Crashed if ratio=TRUE.
	   Fixed.

    o   intersect.owin
	   Ignored argument 'fatal' in some cases.
	   [Spotted by Agustin Lobo.]
	   Fixed.

    o   plot.tess
	   Crashed if do.col=TRUE and 'values' was a factor.
	   Fixed.

    o   pcf.ppp
	   Crashed if 'domain' was given and ratio=TRUE.
	   Fixed.

    o   "[<-.sparse3Darray"
	   Crashed if 'value' was one-dimensional
	   and the indices i, j, k specified a two-dimensional subset of x.
	   Fixed.

    o   plot.quad
	   Crashed if tiles=TRUE for a quadrature scheme
	   created by quadscheme(method="dirichlet", exact=TRUE).
	   Fixed.

    o   bugtable
	   Crashed if there were no bugs!
	   Fixed.

    o   sparse array code
	   An array bounds violation (segmentation fault) could occur.
	   Fixed.

    o   internal code
	   Numerous internal bugs have been fixed.

                 Changes in version 1.56-0 (2018-06-15)                 

OVERVIEW

    o   We thank Sebastian Meyer and Suman Rakshit for contributions.

    o   Kernel estimate of intensity as a function(x,y)

    o   Extract discrete and continuous components of a measure.

    o   Improvements and extensions to leverage and influence code.

    o   Plot a line segment pattern using line widths.

    o   Find connected components of each tile in a tessellation.

    o   Geometrical operations on 'distfun' objects.

    o   Join vertices in a linear network.

    o   Distance map and contact distribution for rectangular structuring element.

    o   An infinite number of infinitesimal bugs has been detected and fixed.

    o   Version nickname: "Bondi Tram"

NEW FUNCTIONS

    o   densityfun, densityfun.ppp
	   Compute a kernel estimate of intensity of a point pattern
	   and return it as a function of spatial location.

    o   as.im.densityfun
	   Convert function(x,y) to a pixel image.

    o   measureDiscrete, measureContinuous
	   Extract the discrete and continuous components of a measure.

    o   connected.tess
	   Find connected components of each tile in a tessellation
	   and make a new tessellation composed of these pieces.

    o   dffit.ppm
	   Effect change diagnostic DFFIT for spatial point process models.

    o   shift.distfun, rotate.distfun, reflect.distfun, flipxy.distfun,
	   affine.distfun, scalardilate.distfun
	   Methods for geometrical operations on 'distfun' objects.

    o   rescale.distfun
	   Change the unit of length in a 'distfun' object.

    o   plot.indicfun
	   Plot method for indicator functions created by as.function.owin.

    o   Smooth.leverage.ppm, Smooth.influence.ppm
	   Smooth a leverage function or an influence measure.

    o   integral.leverage.ppm, integral.influence.ppm
	   Compute the integral of a leverage function or an influence measure.

    o   mean.leverage.ppm
	   Compute the mean value of a leverage function.

    o   rectdistmap
	   Distance map using rectangular metric.

    o   rectcontact
	   Contact distribution function using rectangular structuring element.

    o   joinVertices
	   Join specified vertices in a linear network.

SIGNIFICANT USER-VISIBLE CHANGES

    o   plot.psp
	   Segments can be plotted with widths proportional to their mark values.
	   New argument 'style'.

    o   msr
	   Infinite and NA values are now detected (if check=TRUE)
	   and are reset to zero, with a warning.

    o   leverage.ppm, influence.ppm, dfbetas.ppm
	   Faster computation in some cases.

    o   as.im.nnfun, as.im.smoothfun
	   New argument 'approx' chooses between a fast, approximate algorithm
	   and a slow, exact algorithm.

    o   cdf.test
	   More jittering is applied when jitter=TRUE.
	   Warnings about tied values should not occur any more.

    o   plot.im
	   Improved behaviour when all pixel values are NA.

    o   plot.tess
	   Now generates a separate plot panel for each column of marks,
	   if do.col=TRUE.
	   New argument 'multiplot'.

    o   pcfinhom
	   Now handles correction='good'

    o   solist
	   New argument '.NameBase'

    o   runifpointOnLines, rpoisppOnLines
	   New argument 'drop'

    o   plot.studpermutest
	   This existing function now has a help file.

    o   bdist.points
	   Accelerated, for polygonal windows (thanks to Sebastian Meyer).

    o   linnet
	   When argument 'edges' is specified, the code now checks whether
	   any edges are duplicated.

BUG FIXES

    o   kernel.moment
	   Result was incorrect for kernel="cosine" and kernel="optcosine".
	   Fixed.

    o   "[.msr"
	   Format was mangled if the subset contained exactly one quadrature point.
	   Fixed.

    o   tess
	   If a list of tiles was given, and the tiles were pixel images or masks,
	   their pixel resolutions were ignored, and reset to the default 128x128.
	   Fixed.

    o   plot.linim
	   Ignored argument 'legend' when style="colour".
	   [Spotted by Suman Rakshit.]
	   Fixed.

    o   leverage.ppm, influence.ppm, dfbetas.ppm
	   Crashed sometimes if the model was fitted by method="logi".
	   Fixed.

    o   Smooth.ppp
	   Crashed with some combinations of the arguments varcov and weights
	   when X had several columns of marks.
	   Fixed.

    o   plot.tess
	   Crashed sometimes when do.col=TRUE and values=NULL.
	   Fixed.

    o   dilation.ppp
	   Crashed if polygonal=FALSE.

    o   plot.tess
	   Ignored the marks of a tessellation defined by a pixel image.
	   Fixed.

    o   predict.ppm
	   Crashed when computing a confidence interval or prediction interval
	   if 'window' was a tessellation.
	   Fixed.

    o   tiles
	   names(tiles(x)) was not always identical to tilenames(x).
	   Fixed.

    o   model.images.lppm
	   Crashed in many cases.
	   Fixed.

    o   model.images.lppm
	   Names or dimnames were missing in some cases.
	   Fixed.

    o   nncross.ppp
	   Result had the wrong format if npoints(X) = 0 and length(what) = 1.
	   (Spotted by Sebastian Meyer).
	   Fixed.

    o   plot.colourmap
	   Crashed if the colourmap was defined on an interval of dates or times.
	   Fixed.

    o   StraussHard, leverage.ppm, influence.ppm, dfbetas.ppm
	   Leverage and influence calculations generated an error 
	   when applied to models fitted with the StraussHard interaction.
	   Fixed.

    o   "[.ppp"
	   Crashed if there were several columns of marks,
	   some of which were factors, and drop=TRUE.
	   Fixed.

                 Changes in version 1.55-1 (2018-04-05)                 

OVERVIEW

    o   We thank Jens Astrom, Ines Moncada, Mehdi Moradi and Nicholas Read
	   for contributions.

    o   More support for tessellations.

    o   Improved support for linear networks.

    o   Fixed longstanding bug in leverage and influence diagnostics.

    o   Minor improvements and bug fixes.

    o   Version nickname: "Gamble Responsibly"

NEW FUNCTIONS

    o   summary.ssf
	   Summary method for a spatially sampled function (class 'ssf').

    o   unstack.tess
	   Given a tessellation with multiple columns of marks,
	   take the columns one at a time, and return a list of tessellations,
	   each carrying only one of the original columns of marks.

SIGNIFICANT USER-VISIBLE CHANGES

    o   plot.tess
	   This plot method can now fill each tile with a different colour.
	   New arguments 'do.col', 'values', 'col' and 'ribargs'.
	   Old argument 'col' has been renamed 'border' for consistency.

    o   integral.linim, integral.linfun
	   Argument 'domain' can now be a tessellation.

    o   integral.ssf
	   Argument 'domain' can now be a tessellation.

    o   as.owin.default
	   Now accepts a structure with entries named 'xmin,ymin,xmax,ymax'
	   in any order. This handles objects of class 'bbox' in the 'sf' package.

    o   as.owin.default
	   Now detects objects of class "SpatialPolygons"
	   and issues a more helpful error message.

    o   pseudoR2.ppm, pseudoR2.lppm
	   The null model now includes any offset terms, by default.
	   [Suggested by Jens Astrom.]
	   New argument 'keepoffset'.

    o   closepairs.ppp
	   New argument 'periodic'

    o   fitted.ppm
	   New argument 'ignore.hardcore'.

    o   predict.ppm
	   New argument 'ignore.hardcore'.

    o   leverage.ppm, influence.ppm, dfbetas.ppm
	   Computation has been vastly accelerated for models with Geyer interaction
	   fitted using isotropic or translation edge corrections.

    o   leverage.ppm, influence.ppm, dfbetas.ppm
	   Virtually all models and edge corrections are now supported,
	   using a "brute force" algorithm. This can be slow in some cases.

    o   cdf.test
	   Monte Carlo test runs faster.

    o   summary.distfun, summary.funxy
	   Pixel resolution can now be controlled.

    o   persp.funxy
	   Improved z-axis label.

    o   plot.ppp
	   Improved placement of symbol legend when argument 'symap' is given.

    o   plot.msr
	   Changed the default rule for bandwidth for smoothing the density.

BUG FIXES

    o   nnmark, as.im.ssf
	   if marks(X) was a matrix rather than a data frame, 
	   the results were completely incorrect (and had completely wrong format).
	   Fixed.

    o   predict.mppm
	   If the model included random effects, and if the library 'MASS' was not loaded,
	   the predictions were on the log scale (i.e. they were logarithms of the correct values).
	   [Spotted by Nicholas Read.]
	   Fixed.

    o   leverage.ppm, influence.ppm, dfbetas.ppm
	   Calculations were slightly incorrect for models with a hard core.
	   Fixed.

    o   leverage.ppm
	   The mean leverage value (shown as a contour line in plot.leverage.ppm)
	   was slightly incorrect for Gibbs models.
	   Fixed.

    o   Ops.msr
	   If the input data contained an auxiliary pixel image of
	   the density component of the measure (attribute "smoothdensity")
	   this image was not updated; it was copied to the output unchanged.
	   Plots of the resulting measure were incorrect, but calculations
	   with the measure were correct.
	   Fixed.

    o   integral.msr
	   If the result was a matrix, it was the transpose of the correct answer.
	   Fixed.

    o   "[.linim"
	   The result sometimes had the wrong class.
	   Fixed.

    o   "[.linnet"
	   In calculating L[W] where W is a window, the code ignored
	   segments of L that crossed W without having a vertex in W.
	   Fixed.

    o   nnmap
	   Crashed if W = NULL.
	   Fixed.

    o   density.lpp, nncross.lpp
	   Crashed sometimes with an obscure message about "z$which".
	   [Spotted by Ines Moncada.]
	   Fixed.

    o   as.im.distfun
	   Crashed, for the distfun of a point pattern, if approx=FALSE.
	   Fixed.

    o   as.solist
	   Crashed when x was a 'layered' object.
	   Fixed.

    o   linnet
	   Crashed in some trivial cases where there were no points or lines.
	   Fixed.

                 Changes in version 1.55-0 (2018-01-29)                 

OVERVIEW

    o   We thank 'AdriMaz' and Nicholas Read for contributions.

    o   Lurking variable plot for models fitted to several point patterns.

    o   Improvements to code for class 'mppm'.

    o   Improvements to leverage and influence diagnostics.

    o   Improved summary information for funxy and distfun objects.

    o   Bug fixes and improvements.

    o   Removed old warnings and deprecated functions.

    o   Nickname: "Stunned Mullet"

NEW FUNCTIONS

    o   contour.leverage.ppm
	   Method for 'contour' for leverage functions of class 'leverage.ppm'

    o   lurking
	   New generic function for lurking variable plots.

    o   lurking.ppp, lurking.ppm
	   These are equivalent to the original function 'lurking'.
	   They are now methods for the new generic 'lurking'.

    o   lurking.mppm
	   New method for class 'mppm'
	   Lurking variable plot for models fitted to several point patterns.

    o   print.lurk
	   Prints information about the object returned by the function 'lurking'
	   representing a lurking variable plot.

    o   model.matrix.mppm
	   Method for 'model.matrix' for models of class 'mppm'.

    o   test.crossing.psp,  test.selfcrossing.psp
	   Previously undocumented functions for testing whether segments cross.

SIGNIFICANT USER-VISIBLE CHANGES

    o   predict.ppm
	   Now recognises the arguments 'dimyx' and 'eps' for specifying the
	   resolution of the grid of prediction points.

    o   leverage.ppm, dfbetas.ppm
	   Increased the default resolution of the pixel images.
	   Spatial resolution can now be controlled by the arguments 'dimyx', 'eps'.

    o   ppmInfluence
	   The result now belongs to class 'ppmInfluence', for which there are
	   methods for 'leverage', 'influence', 'dfbetas' which extract the
	   desired component.

    o   plot.leverage.ppm
	   New argument 'what'.

    o   persp.leverage.ppm
	   New arguments 'zlab' and 'what'.

    o   as.im.leverage.ppm
	   New argument 'what'.

    o   summary.funxy, summary.distfun
	   Printed information now includes a summary of the function values.

    o   lurking.ppm
	   Accelerated.

    o   "[.psp"
	   Accelerated.

    o   clf.test, conspire, bounding.box, ksmooth.ppp, mpl, superimposePSP,
	   eval.hyper, smooth.fv, smooth.ppp, smooth.msr, rtoro, plot.kstest
	   These deprecated functions have now been removed.

    o   bermantest
	   This deprecated function has now been removed.
	   Use berman.test instead.

    o   kstest
	   This deprecated function has now been removed.
	   Use cdf.test instead.

    o   plot.ppp
	   A very old warning, about the interpretation of the mark scale
	   as the circle diameter, is no longer printed.

BUG FIXES

    o   nnmap, nnmark
	   Values were incorrect if the resulting pixel image
	   had unequal numbers of rows and columns.
	   Fixed.

    o   vcov.mppm
	   Format was incorrect (rows/columns were omitted) in some cases.
	   Fixed.

    o   model.matrix.ppm, model.frame.ppm
	   Values were sometimes incorrect when applied to the result of subfits().
	   To be precise, if 'fit' was an mppm object fitted to a hyperframe
	   that included 'design covariates' (covariates that take a constant value
	   in each row of the hyperframe), and if 'futs <- subfits(fit)', then
	   model.matrix(futs[[i]]) gave incorrect values in the columns
	   corresponding to the design covariates. 
	   Fixed.

    o   model.matrix.ppm
	   The attribute 'assign' was omitted, in some cases.
	   Fixed.

    o   simulate.dppm, simulate.detpointprocfamily
	   In dimensions higher than 2, the result was shifted so that
	   it was centred at the origin.
	   Fixed.

    o   Smooth.ppp
	   Crashed if geometric=TRUE and there were several columns of marks.
	   Fixed.

    o   simulate.dppm, simulate.detpointprocfamily
	   Crashed if nsim > 1 and the spatial dimension was not equal to 2.
	   Fixed.

    o   plot.leverage.ppm
	   Contour line was annotated, which was not intended.
	   Fixed.

    o   leverage.ppm
	   The leverage function was oversmoothed, when the model was fitted
	   with method="logi".
	   Fixed.

                 Changes in version 1.54-0 (2017-11-21)                 

OVERVIEW

    o   We thank Rochelle Constantine, Lily Kozmian-Ledward,
	   Ian Renner and Leigh Torres for contributions.

    o   New dataset 'cetaceans'.

    o   Gamma correction for colour maps and image plots.

    o   Class 'units' has been renamed 'unitname' to avoid package collision.

    o   Bug fix in leverage code

    o   Tighter bounding box for psp, lpp, linnet objects.

    o   Improved layout in plot.solist

    o   Tools to increase colour saturation.

    o   Connected components of a 3D point pattern.

    o   Accelerated computations on linear networks.

    o   Accelerated simulation of determinantal point processes.

    o   Improved printing of 3D point patterns.

    o   Minor corrections to handling of unitnames.

    o   Nickname: 'Vacuous Mission Statement' 

NEW DATASETS

    o   cetaceans
	   Nine replicates of a marine survey in New Zealand,
	   consisting of recorded sightings of dolphins, whales and other species.
	   Generously contributed by Lily Kozmian-Ledward, Rochelle Constantine
	   and Leigh Torres.

NEW FUNCTIONS

    o   to.saturated
	   Convert a colour value to the corresponding fully-saturated colour.

    o   intensity.psp
	   Compute the average total length of segments per unit area.

    o   boundingbox.psp
	   Bounding box for line segment patterns.
	   This produces a tighter bounding box than the previous default behaviour.

    o   boundingbox.lpp
	   Bounding box for point patterns on a linear network.
	   This produces a tighter bounding box than the previous default behaviour.

    o   boundingbox.linnet
	   Bounding box for a linear network.
	   This produces a tighter bounding box than the previous default behaviour.

    o   "Frame<-.default"
	   New default method for assigning bounding frame to a spatial object.

    o   connected.pp3
	   Connected components of a 3D point pattern.

    o   colouroutputs, "colouroutputs<-"
	   Extract or assign colour values in a colour map.
	   (Documented a previously-existing function)

SIGNIFICANT USER-VISIBLE CHANGES

    o   plot.im
	   New argument 'gamma' supports gamma correction of colour maps.
	   New argument 'ncolours' specifies the default number of colours.

    o   colourmap, lut
	   New argument 'gamma' supports gamma correction of colour maps.

    o   plot.solist, plot.anylist
	   New argument 'panel.vpad' controls vertical space for panel title
	   when equal.scales=FALSE.

    o   class 'units'
	   The class 'units' has been renamed 'unitname' to avoid a clash with
	   other packages.

    o   unitname
	   The generic function 'unitname' now returns an object of class 'unitname'. 

    o   print.units, summary.units, print.summary.units, as.character.units,
	   compatible.units
	   These methods are now called print.unitname, summary.unitname,
	   print.summary.unitname, as.character.unitname and compatible.unitname.

    o   as.units
	   This function has been renamed 'as.unitname' and now returns
	   an object of class 'unitname'.

    o   rescale.units
	   This method has been renamed 'rescale.unitname' and now returns
	   an object of class 'unitname'.

    o   profilepl
	   New argument 'fast' controls the use of shorcuts.

    o   reload.or.compute
	   New argument 'force'.

    o   pixellate.ppp, pixellate.owin, pixellate.psp
	   New argument 'DivideByPixelArea'.

    o   density.psp
	   New argument 'at' determines locations where the density is evaluated.

    o   as.solist
	   as.solist(x) always returns an object of class 'solist',
	   removing any additional classes.

    o   lineardirichlet
	   Accelerated.

    o   integral.linim
	   Accelerated.

    o   "[.ppp", "[.lpp", "[.psp"
	   In the expression X[W] where W is a window,
	   if X has a unitname but W does not, 
	   the result now inherits the unitname of X.

    o   distfun.ppp
	   New argument 'undef'.

    o   print.pp3
	   More informative output when x is marked.

BUG FIXES

    o   leverage.ppm, influence.ppm, dfbetas.ppm
	   Calculations were slightly incorrect for models fitted using the
	   border correction.
	   Fixed.

    o   integral.linim
	   Gave incorrect value in some extreme cases
	   (where many network segments were shorter than one pixel width).
	   Fixed.

    o   update.kppm
	   Did not function correctly when several additional arguments were given.
	   Fixed.

    o   plot.solist
	   Panel titles were cut off, when equal.scales=FALSE (the default).
	   Fixed.

    o   intersection.owin, union.owin, setminus.owin
	   The result sometimes did not inherit the correct 'unitname'.
	   Fixed.

                 Changes in version 1.53-2 (2017-10-08)                 

OVERVIEW

    o   We thank Christophe Biscio and Rasmus Waagepetersen for contributions.

    o   Correction to 'lohboot'

    o   Improvements to ppm and update.ppm

    o   Bug fixes and minor improvements.

    o   Nickname: "Quantum Entanglement"

NEW FUNCTIONS

    o   fitin.profilepl
	   Extract the fitted interaction from a model fitted by profile likelihood.

SIGNIFICANT USER-VISIBLE CHANGES

    o   lohboot
	   Algorithm has been corrected and extended
	   thanks to Christophe Biscio and Rasmus Waagepetersen.
	   New arguments 'block', 'basicboot', 'Vcorrection'.

    o   ppm.ppp, ppm.quad
	   New argument 'clipwin'

    o   update.ppm
	   For the case 'update(model, X)' where X is a point pattern,
	   if the window of X is different from the original window,
	   then the model is re-fitted from scratch (i.e. use.internal=FALSE).

    o   plot.leverage.ppm
	   A contour line showing the average value of leverage
	   is now drawn on the colour ribbon, as well as on the main image.
	   New argument 'args.contour'.

BUG FIXES

    o   lohboot
	   Implementation was completely incorrect.
	   [Spotted and fixed by Christophe Biscio and Rasmus Waagepetersen.]
	   Fixed.

    o   update.ppm
	   Did not always work correctly with formulae that included 'polynom()' terms.
	   Fixed.

                       Changes in version 1.53-1                        

OVERVIEW

    o   We thank Suman Rakshit for contributions.

    o   Bug fix in plot.linim

    o   Nickname: "Drongo"

BUG FIXES

    o   plot.linim
	   Colour map was mangled if log=TRUE.
	   Fixed.

                       Changes in version 1.53-0                        

OVERVIEW

    o   We thank Tilman Davies and Mehdi Moradi for contributions.

    o   Numerous bug fixes for linear networks code.

    o   spatstat now requires the sub-package 'spatstat.data'
	   which contains the datasets.

    o   Minor enhancements and bug fixes.

    o   Nickname: "Tinfoil Hat"

NEW FUNCTIONS

    o   "[<-.linim"
	   Subset assignment method for pixel images on a linear network.

    o   nnfromvertex
	   Given a point pattern on a linear network,
	   find the nearest data point from each vertex of the network.

    o   tile.lengths
	   Calculate the length of each tile in a tessellation on a network.

    o   text.ppp, text.lpp, text.psp
	   Methods for 'text' for spatial patterns.

SIGNIFICANT USER-VISIBLE CHANGES

    o   datasets
	   All datasets installed in 'spatstat' have now been moved
	   into the sub-package 'spatstat.data'. This should not have any effect
	   on normal use. The 'spatstat.data' package is automatically loaded
	   when spatstat is loaded, and the datasets are lazy-loaded so that
	   they are available in the usual way. To list all datasets you now need
	   to type 'data(package="spatstat.data")'

    o   nbfires
	   This dataset now includes information about the different 
	   land and sea borders of New Brunswick.

    o   rhohat
	   New argument 'subset' allows computation for a subset of the data.

    o   predict.lppm
	   Argument 'locations' can now be an 'lpp' object.

    o   ewcdf
	   Argument 'weights' can now be NULL.

    o   plot.msr
	   New arguments 'equal.markscale' and 'equal.ribbon'.

    o   plot.im
	   The number of tick marks in the colour ribbon can now be controlled
	   using the argument 'nint' in 'ribargs'.

    o   plot.symbolmap
	   New argument 'nsymbols' controls the number of symbols plotted.

    o   square
	   Handles a common error in the format of the arguments.

    o   [.linim
	   More robust against artefacts.

    o   [.linnet
	   More robust against artefacts when the subset index is a pixel mask.

    o   linim
	   The image Z is now automatically restricted to the network.
	   New argument 'restrict'.

    o   plot.linim
	   When style="width", negative values are plotted in red (by default).
	   New argument 'negative.args' controls this.

    o   plot.linim
	   New argument 'zlim' specifies the range of values to be mapped.

    o   Summary.linim
	   Recognises the argument 'finite' so that range(x, finite=TRUE)
	   works for a linim object x.

    o   identify.psp
	   Improved placement of labels.
	   Arguments can be passed to text.default to control the plotting of labels.

    o   as.polygonal
	   Accelerated when w is a pixel mask.

    o   density.lpp
	   Accelerated in the default case.

    o   Kinhom
	   Stops gracefully if 'lambda' contains any zero values.

    o   print.linim
	   Prints more information.

BUG FIXES

    o   with.msr
	   The value of 'atommass' was incorrect, due to a coding error.
	   Fixed.

    o   [.linim
	   Internal data was sometimes corrupted.
	   Fixed.

    o   as.linim
	   The result had incorrect internal format when Window(X) was a mask
	   and one of the arguments 'eps', 'dimyx', 'xy' was present.
	   Fixed.

    o   as.im.im
	   If W was a rectangle or polygonal window, the pixel resolution of the 
	   result was determined by the spatstat defaults, rather than being
	   determined by the image argument X. This was contrary to the
	   rule advertised in help(as.im). 
	   Fixed.

    o   density.lpp
	   In the 'slow' case (kernel not Gaussian, or continuous=FALSE),
	   occasionally a pixel could incorrectly be assigned the value 1.
	   [Spotted by Mehdi Moradi.]
	   Fixed.

    o   "[.solist"
	   Ignored the "..." arguments in some cases.
	   Fixed.

    o   density.lpp
	   Ignored the resolution arguments 'eps', 'dimyx' in the default case.
	   Fixed.

    o   plot.msr
	   Plotted the panel titles on top of each other, if how="contour".
	   Fixed.

    o   contour.im
	   Plotted the title text at the wrong place when add=TRUE and show.all=TRUE.
	   Fixed.

    o   predict.lppm
	   Crashed if 'locations' was an 'lpp' object.
	   Fixed.

    o   plot.ppp
	   Crashed if the window had height 0 and width 0
	   and the pattern had several columns of marks.
	   Fixed.

    o   plot.solist
	   Crashed if all panels had windows of height 0 and width 0.
	   Fixed.

    o   linearK, linearKinhom, linearpcf, linearpcfinhom
	   Crashed if the linear network was disconnected and one component
	   of the network contained fewer than 2 points.
	   Fixed.

    o   integral.linim
	   Crashed in some cases.
	   Fixed.

    o   "[.linim"
	   Crashed in some cases.
	   Fixed.

                 Changes in version 1.52-1 (2017-08-16)                 

OVERVIEW

    o   Bug fix to satisfy the development version of R.

    o   Nickname: "Apophenia"

SIGNIFICANT USER-VISIBLE CHANGES

    o   Ops.imlist
	   Improved the 'names' of the result.

BUG FIXES

    o   bw.smoothppp
	   Crashes in R-devel.
	   Fixed.

                       Changes in version 1.52-0                        

OVERVIEW

    o   We thank Nicholas Read, Abdollah Jalilian, Suman Rakshit,
	   Dominic Schuhmacher and Rasmus Waagepetersen for contributions.

    o   Important bug fixes.

    o   Now handles disconnected linear networks.

    o   Effect function is now available for all types of fitted model.

    o   A model can be fitted or re-fitted to a sub-region of data.

    o   More support for measures.

    o   'Pool' operations improved.

    o   Geometric-mean smoothing.

    o   Changed algorithm defaults in ippm.

    o   Version nickname: "Rudimentary Lathe"

NEW FUNCTIONS

    o   as.data.frame.envelope
	   Extract function data from an envelope object,
	   including the functions for the simulated data ('simfuns')
	   if they were saved.

    o   is.connected, is.connected.default, is.connected.linnet
	   Determines whether a spatial object consists of
	   one topologically connected piece, or several pieces.

    o   is.connected.ppp
	   Determines whether a point pattern is connected after
	   all pairs of points closer than distance R are joined.

    o   hist.funxy
	   Histogram of values of a spatial function.

    o   model.matrix.ippm
	   Method for 'model.matrix' which allows computation of
	   regular and irregular score components.

    o   harmonise.msr
	   Convert several measures (objects of class 'msr')
	   to a common quadrature scheme.

SIGNIFICANT USER-VISIBLE CHANGES

    o   Smooth.ppp
	   New argument 'geometric' supports geometric-mean smoothing.

    o   Kinhom
	   New argument 'ratio'.

    o   linearKinhom, linearpcfinhom
	   Changed default behaviour when 'lambda' is a fitted model.
	   New arguments 'update' and 'leaveoneout'.

    o   linearK, linearKinhom, linearpcf, linearpcfinhom, compilepcf
	   Ratio calculations are now supported.
	   New argument 'ratio'.

    o   effectfun
	   Now works for 'ppm', 'kppm', 'lppm', 'dppm', 'rppm' and 'profilepl' objects.

    o   ppm, kppm
	   The argument 'subset' can now be a window (class 'owin')
	   specifying the subset of data to which the model should be fitted.

    o   fitted.lppm
	   New argument 'leaveoneout' allows leave-one-out computation of fitted value.

    o   pool.rat
	   New arguments 'relabel' and 'variance'.

    o   density.lpp
	   The return value is a pixel image of class 'linim' in all cases.

    o   plot.linim, plot.linfun
	   A scale bar is now plotted when style="width".
	   New argument 'legend'.

    o   ippm
	   Default values for the parameters of the optimisation algorithm (nlm.args)
	   have changed.

    o   ippm
	   The internal format of the result has been extended slightly.

    o   bind.fv
	   New argument 'clip'.

    o   as.im.distfun
	   New argument 'approx' specifies the choice of algorithm.

    o   "[.psp"
	   New argument 'fragments' specifies whether to keep fragments of
	   line segments that are cut by the new window, or only to retain
	   segments that lie entirely inside the window.

    o   predict.rhohat
	   New argument 'what' determines which value should be calculated:
	   the function estimate, the upper/lower confidence limits, or the
	   standard error.

    o   pool.fv
	   New arguments 'relabel' and 'variance'

    o   pool.rat
	   New argument 'weights'.

    o   plot.msr
	   New argument 'massthresh'.

    o   Ops.msr
	   Calculations like A+B can now be performed even when the measures A and B
	   are not defined on the same quadrature scheme.

    o   density.ppp
	   New argument 'verbose'.

    o   bw.pcf
	   New argument 'verbose'.

    o   hist.im
	   New argument 'xname'.

    o   [.leverage.ppm
	   New argument 'update'.

    o   [.layered
	   Additional arguments '...' are now passed to other methods.

    o   logLik.ppm
	   The warning about pseudolikelihood ('log likelihood not available')
	   is given only once, and is not repeated in subsequent calls,
	   within a spatstat session.

    o   kppm
	   Refuses to fit a log-Gaussian Cox model with anisotropic covariance.

    o   plot.linim, plot.linfun
	   The return value has a different format.
	   Arguments have been renamed and reorganised.

    o   density.lpp
	   New argument 'old'.

    o   ippm
	   Accelerated.

    o   Smooth.ppp
	   Now exits gracefully if any mark values are NA, NaN or Inf.

    o   timeTaken
	   Now exits gracefully if there is no timing information.

    o   nbfires
	   The unit of length for the coordinates is now specified in this dataset.

BUG FIXES

    o   bw.pcf
	   Results were totally incorrect due to a typo.
	   [Spotted by Abdollah Jalilian and Rasmus Waagepetersen.]
	   Fixed.

    o   predict.rho2hat
	   Results were incorrect for a rho2hat object computed from a point pattern.
	   Fixed.

    o   density.ppp
	   If the smoothing bandwidth was very small (e.g.\ smaller than pixel width),
	   results were inaccurate if the default resolution was used,
	   and completely wrong if another resolution was specified.
	   [Spotted by Dominic Schuhmacher.]
	   Fixed.

    o   linearK, linearKinhom, linearpcf, linearpcfinhom, linearKcross,
	   linearKdot, linearpcfcross, linearpcfdot, linearKcross.inhom,
	   linearKdot.inhom, linearpcfcross.inhom, linearpcfdot.inhom
	   Crashed if the network was disconnected.
	   Fixed.

    o   crossdist.lpp
	   Crashed if the network was disconnected.
	   Fixed.

    o   countends
	   Crashed if the network was disconnected.
	   Fixed.

    o   model.images.ppm
	   Crashed for models fitted using 'covfunargs'.
	   Fixed.

    o   model.matrix.ppm
	   Crashed for models fitted using 'covfunargs',
	   if argument 'Q' was given.
	   Fixed.

    o   polynom
	   Expansion of some polynomials caused an error message
	   about 'invalid model formula'.
	   Fixed.

    o   plot.ppp
	   The argument 'type="n"' did not suppress plotting of the legend,
	   for marked point patterns.
	   Fixed.

    o   plot.psp
	   Ignored 'show.all' when 'add=TRUE'.
	   Fixed.

    o   intensity.ppm
	   Result had incorrect 'names' attribute in some cases.
	   Fixed.

    o   marks<-.ppx
	   The assignment marks(X) <- a, where 'a' is a single atomic value,
	   caused an error if 'X' contained zero points.
	   Fixed

    o   model.depends
	   Crashed when applied to regression models fitted by 'gam',
	   or point process models fitted by 'ppm' with 'use.gam=TRUE'.
	   Fixed.

    o   pool.fv
	   Crashed sometimes, if the arguments did not have the same set of
	   column names.
	   Fixed.

    o   pool.rat
	   Crashed with an error message from 'fmt'
	   if there were more than 20 objects to be pooled.
	   Fixed.

    o   linearK
	   The 'theo' column was missing if npoints(X) < 2 and correction="Ang".
	   Fixed.

    o   model.matrix.ppm
	   Result was malformed if the model was fitted with 'use.gam=TRUE'.
	   Fixed.

    o   effectfun
	   Crashed if 'covname' was omitted,
	   if the model was fitted with 'use.gam=TRUE'.
	   Fixed.

    o   nncross.lpp
	   Result had incorrect format if Y was empty, in some cases.
	   Fixed.

    o   linearKinhom
	   Plot label for y axis was incorrect.
	   [Spotted by Suman Rakshit.]
	   Fixed.

    o   plot.solist
	   If the entries were 'linim' objects, they were plotted using image()
	   so arguments like 'style="w"' were ignored.
	   Fixed.

    o   as.ppp.data.frame
	   Crashed if X was an object of class 'tbl_df' from the dplyr package.
	   Fixed.

    o   plot.lpp
	   Crashed if there were multiple columns of marks.
	   Fixed.

                 Changes in version 1.51-0 (2017-05-08)                 

OVERVIEW

    o   We thank Greg McSwiggan, Mehdi Moradi and Tammy L Silva for contributions.

    o   New fast algorithm for kernel smoothing on a linear network.

    o   Leverage and influence diagnostics extended to Poisson/Gibbs models
	     fitted by logistic composite likelihood.

    o   Two-stage Monte Carlo test.

    o   Dirichlet/Voronoi tessellation on a linear network.

    o   Thinning of point patterns on a linear network.

    o   More support for functions and tessellations on a linear network.

    o   Improvements and bug fixes.

    o   Version nickname: 'Poetic Licence'

NEW FUNCTIONS

    o   bits.test:
	   Balanced Independent Two-Stage Monte Carlo test,
	   an improvement on the Dao-Genton test.

    o   lineardirichlet
	   Computes the Dirichlet-Voronoi tessellation associated with a
	   point pattern on a linear network.

    o   domain.lintess, domain.linfun
	   Extract the linear network from a 'lintess' or 'linfun' object.

    o   summary.lintess
	   Summary of a tessellation on a linear network.

    o   clicklpp
	   Interactively add points on a linear network.

    o   envelopeArray
	   Generate an array of envelopes using a function that returns 'fasp' objects.

SIGNIFICANT USER-VISIBLE CHANGES

    o   density.lpp
	   New fast algorithm (up to 1000 times faster) for the default case
	   where kernel="gaussian" and continuous=TRUE.
	   Generously contributed by Greg McSwiggan.

    o   leverage.ppm, influence.ppm, dfbetas.ppm
	   These methods now work for models that were fitted by logistic
	   composite likelihood (method='logi'). 

    o   rthin
	   Argument X can now be a point pattern on a linear network (class 'lpp').

    o   fitted.ppm
	   New option: type = "link"

    o   update.kppm
	   New argument 'evaluate'.

    o   integral.linfun
	   New argument 'delta' controls step length of approximation to integral.

    o   as.linim.default
	   New argument 'delta' controls spacing of sample points in internal data.

    o   as.linfun.lintess
	   New argument 'values' specifies the function value for each tile.
	   New argument 'navalue'.

BUG FIXES

    o   leverage.ppm, influence.ppm, dfbetas.ppm
	   Results for Gibbs models were incorrect due to a mathematical error.
	   (Results for Poisson models were correct). 
	   Fixed.

    o   leverage.ppm, influence.ppm, dfbetas.ppm, ppmInfluence
	   Calculations were incorrect for a Geyer model fitted using
	   an edge correction other than "border" or "none".
	   Fixed.

    o   step, kppm, update.kppm
	   'step' did not work for kppm objects in some cases
	   due to a scoping problem in update.kppm.
	   Fixed.

    o   improve.kppm
	   Crashed if the window was not a rectangle.
	   Fixed.

    o   pcf.ppp, pcfinhom
	   Crashed if kernel="epa" rather than "epanechnikov".
	   Fixed.

    o   alltypes
	   Crashed if envelope=TRUE and reuse=FALSE.
	   Fixed.

    o   pairdist.lpp, nndist.lpp, nnwhich.lpp, nncross.lpp
	   Crashed if the network was disconnected.
	   Fixed.

    o   as.im.linim, as.linim.linim
	   Additional arguments such as 'eps' and 'dimyx' were ignored.
	   Fixed.

    o   as.im.default
	   Arguments 'eps and 'xy' were ignored if X was a single numeric value.
	   Fixed.

    o   'timed' class
	   Printing of these objects did not work in some locales.
	   Fixed.

    o   runifpoint
	   Ignored 'drop' argument if the window was a rectangle.
	   Fixed.

                 Changes in version 1.50-0 (2017-03-23)                 

OVERVIEW

    o   We thank Richard Cotton, Adrian Heyner, Abdollah Jalilian,
	   Dominic Schuhmacher and Rasmus Waagepetersen for contributions.

    o   spatstat now 'Imports' the package 'spatstat.utils'.

    o   Bandwidth selection for pair correlation function.

    o   Improvements and bug fixes.

    o   Version nickname: 'Bunyip Aristocracy'

NEW PACKAGE STRUCTURE

    o   spatstat is being split into several sub-packages, to satisfy
	   the requirements of CRAN. This should not affect the user:
	   existing code will continue to work in the same way.
	   Currently there are two sub-packages, called 'spatstat.utils'
	   and 'spatstat'. Typing 'library(spatstat)' will load the familiar
	   'spatstat' package which can be used as before, and will silently
	   import the 'spatstat.utils' package. The 'spatstat.utils' package
	   contains utility functions that were originally written for 'spatstat':
	   they were undocumented internal functions in 'spatstat', but are now
	   documented and accessible in a separate package because they may be
	   useful for other purposes. To access these functions, you need to
	   type 'library(spatstat.utils)'. 

NEW FUNCTIONS

    o   bw.pcf
	   Bandwidth selection for pair correlation function.
	   Original code contributed by Abdollah Jalilian and Rasmus Waagepetersen.

    o   grow.box3
	   Expand a three-dimensional box.

SIGNIFICANT USER-VISIBLE CHANGES

    o   as.owin
	   Now refuses to convert a 'box3' to a two-dimensional window.

    o   pixellate.ppp
	   If the pattern is empty, the result is an integer-valued image
	   (by default) for consistency with the results for non-empty patterns.

    o   ppp
	   If the coordinate vectors x and y contain NA, NaN or infinite values,
	   these points are deleted with a warning, instead of causing a fatal error.

    o   ppm
	   Argument 'interaction' can now be a function that makes an interaction,
	   such as Poisson, Hardcore, MultiHard.

    o   pcf, pcfinhom
	   New argument 'close' for advanced use.

    o   runifpointx, rpoisppx
	   New argument 'drop'.

    o   shapley, ponderosa
	   In these installed datasets, the functions shapley.extra$plotit
	   and ponderosa.extra$plotit have changed slightly (to accommodate the
	   dependence on the package spatstat.utils).

    o   kppm
	   Improved printed output.

BUG FIXES

    o   rMaternI, rMaternII
	   If 'win' was a three-dimensional box of class 'box3', 
	   the result was a two-dimensional point pattern.
	   [Spotted by Adrian Heyner.]
	   Fixed.

    o   rmhmodel.ppm, simulate.ppm
	   Crashed when applied to a fitted Lennard-Jones model.
	   [Spotted by Dominic Schuhmacher.]
	   Fixed.

    o   leverage.ppm, influence.ppm, dfbetas.ppm
	   Crashed when applied to some hard-core models.
	   Fixed.

    o   "[.ppx"
	   The format of the result was slightly malformed 
	   if exactly one point was selected.
	   Fixed.

    o   unmark.lpp, marks<-.lpp
	   The result had class c("lpp", "lpp", "ppx") instead of c("lpp", "ppx").
	   Fixed.

                 Changes in version 1.49-0 (2017-02-08)                 

OVERVIEW

    o   We thank Tilman Davies, Kassel Hingee, Abdollah Jalilian,
	   Brian Ripley and Dominic Schuhmacher for contributions.

    o   spatstat now 'Suggests' the package 'fftwtools'.

    o   Operations on signed measures.

    o   Operations on lists of pixel images.

    o   Improved pixellation of point patterns.

    o   Stieltjes integral extended.

    o   Subset operators extended.

    o   Greatly accelerated 'rmh' when using 'nsave'

    o   Some computations accelerated.

    o   Size of namespace reduced, for efficiency.

    o   Bug fixes.

    o   Version nickname: 'So-Called Software'

NEW DEPENDENCIES

    o   fftwtools
	   spatstat now 'Suggests' the package 'fftwtools'.
	   This package provides a very fast implementation of 
	   the Fast Fourier Transform, leading to much faster computation
	   in the spatstat functions 'density.ppp', 'relrisk.ppp', 'convolve.im',
	   'blur', 'scan.test' and many other functions.
	   The 'fftwtools' package requires the external software library 'fftw'.
	   We strongly recommend installing this library if possible.

NEW FUNCTIONS

    o   hexagon, regularpolygon
	   Create regular polygons.

    o   Ops.msr
	   Arithmetic operations for measures.

    o   Math.imlist, Ops.imlist, Summary.imlist, Complex.imlist
	   Arithmetic operations for lists of pixel images.

    o   measurePositive, measureNegative, measureVariation, totalVariation
	   Positive and negative parts of a measure, and variation of a measure.

    o   as.function.owin
	   Convert a spatial window to a function (x,y), the indicator function.

    o   as.function.ssf
	   Convert an object of class 'ssf' to a function(x,y)

    o   as.function.leverage.ppm
	   Convert an object of class 'leverage.ppm' to a function(x,y)

SIGNIFICANT USER-VISIBLE CHANGES

    o   stieltjes
	   Argument 'M' can be a stepfun object (such as an empirical CDF).

    o   quantile.ewcdf
	   The function is now normalised to the range [0,1]
	   before the quantiles are computed. 
	   This can be suppressed by setting normalise=FALSE.

    o   pixellate.ppp
	   New arguments 'fractional' and 'preserve' for more accurate discretisation.

    o   "[.layered"
	   Subset index i can now be an 'owin' object.

    o   "[.solist"
	   Subset index i can now be an 'owin' object.

    o   plot.solist, plot.imlist, plot.anylist
	   Result is now an (invisible) list containing the result
	   from executing the plot of each panel.

    o   ppp
	   New argument 'checkdup'.

    o   Summary.im
	   Argument 'na.rm' is no longer ignored.

    o   cdf.test 
	   The methods for classes ppp, ppm, lpp, lppm, slrm
	   have a new argument 'interpolate'.

    o   as.solist
	   The argument x can now be a spatial object;
	   as.solist(cells) is the same as solist(cells).

    o   bw.diggle, bw.ppl, bw.relrisk, bw.smoothppp
	   These functions now extract and store the name of the unit of length
	   from the point pattern dataset. When the bandwidth selection criterion
	   is plotted, the name of the unit of length is shown on the x-axis.

    o   polynom
	   This function now has a help file.

    o   rmhcontrol
	   New parameter 'pstage' determines when to generate random proposal points.

    o   rmh
	   Accelerated, in the case where multiple patterns are saved using 'nsave'.

    o   bdist.pixels
	   Accelerated for polygonal windows. New argument 'method'.

    o   spatstat namespace
	   The namespace of the spatstat package has been shortened
	   (by internally registering the native routines) which should
	   make the package run faster.

    o   sum.im, range.im, max.im, min.im
	   These functions have been removed, as they are now subsumed in Summary.im.

BUG FIXES

    o   plot.msr
	   If one of 'nrows' or 'ncols' was specified, but not both,
	   an obscure error occurred.
	   Fixed.

    o   plot.solist, plot.imlist, plot.anylist
	   Crashed if 'nrows' and 'ncols' were given values implying
	   that some rows or columns would not contain any plots.
	   Fixed.

    o   as.ppp.lpp
	   Crashed if there was more than one column of marks.
	   Fixed.

    o   has.close.pp3
	   Results were incorrect, or a crash occurred, when argument 'Y' was given.
	   Fixed.

    o   rmpoispp
	   If 'lambda' was a list of images, 'names(lambda)' was ignored,
	   rather than serving as the default value of 'types'.
	   Fixed.

    o   bugfixes
	   Output was garbled, in rare cases.
	   Fixed.

    o   kppm
	   Result was malformed when clusters="VarGamma" and method="clik2".
	   Spotted by Abdollah Jalilian.
	   Fixed.

    o   QQversion
	   Plotting labels were malformed.
	   Fixed.

                 Changes in version 1.48-0 (2016-12-22)                 

OVERVIEW

    o   We thank Kim Colyvas, Yongtao Guan, Gopalan Nair, 
	   Nader Najari, Suman Rakshit, Ian Renner and Hangsheng Wang 
	   for contributions.

    o   Sufficient Dimension Reduction for point processes.

    o   Alternating Gibbs Sampler for point process simulation.

    o   Intensity approximation for area-interaction and Geyer models.

    o   New class of spatially sampled functions.

    o   ROC and AUC extended to other types of point patterns and models.

    o   More support for linear networks.

    o   More support for infinite straight lines.

    o   Simulation of 'rhohat' objects.

    o   Kernel smoothing accelerated.

    o   Methods for 'head' and 'tail' for spatial patterns.

    o   More low-level functionality.

    o   Improvements and bug fixes.

    o   spatstat now has more than 1000 help files.

    o   Nickname: 'Model Prisoner'

NEW CLASSES

    o   ssf
	   Class of spatially sampled functions.

NEW FUNCTIONS

    o   sdr, dimhat
	   Sufficient Dimension Reduction for point processes.
	   Matlab code contributed by Yongtao Guan, translated by Suman Rakshit.

    o   rags, ragsAreaInter, ragsMultiHard
	   Alternating Gibbs Sampler for point processes.

    o   psib
	   Sibling probability (index of clustering strength in a cluster process).

    o   bugfixes    
	   List all bug fixes in recent versions of a package.

    o   roc.kppm, roc.lppm, roc.lpp
	   Methods for 'roc' (receiver operating characteristic curve)
	   for fitted models of class 'kppm' and 'lppm'
	   and point patterns of class 'lpp'

    o   auc.kppm, auc.lppm, auc.lpp
	   Methods for 'auc' (area under the ROC curve)
	   for fitted models of class 'kppm' and 'lppm'
	   and point patterns of class 'lpp'

    o   rlpp
	   Random points on a linear network with a specified probability density.

    o   cut.lpp
	   Method for 'cut' for point patterns on a linear network.

    o   crossing.linnet
	   Find crossing points between a linear network and another set of lines.

    o   ssf
	   Create a spatially sampled function

    o   print.ssf, plot.ssf, contour.ssf, image.ssf
	   Display a spatially sampled function

    o   as.im.ssf, as.ppp.ssf, marks.ssf, marks<-.ssf, unmark.ssf, [.ssf, with.ssf
	   Manipulate data in a spatially sampled function

    o   Smooth.ssf
	   Smooth a spatially sampled function 

    o   integral.ssf
	   Approximate integral of spatially sampled function

    o   simulate.rhohat
	   Generate a Poisson random point pattern with intensity that is
	   a function of a covariate, given by a 'rhohat' object.

    o   head.ppp, head.ppx, head.psp, head.tess, 
	   tail.ppp, tail.ppx, tail.psp, tail.tess
	   Methods for 'head' and 'tail' for spatial patterns.

    o   as.data.frame.tess
	   Convert a tessellation to a data frame.

    o   timeTaken
	   Extract the timing data from a 'timed' object or objects.

    o   rotate.infline, shift.infline, reflect.infline, flipxy.infline
	   Geometrical transformations for infinite straight lines.

    o   whichhalfplane
	   Determine which side of an infinite line a point lies on.

    o   points.lpp
	   Method for 'points' for point patterns on a linear network.

    o   pairs.linim
	   Pairs plot for images on a linear network.

    o   has.close
	   Faster way to check whether a point has a close neighbour.

    o   closetriples
	   Low-level function to find all close triples of points.

    o   matrixpower, matrixsqrt, matrixinvsqrt
	   Raise a matrix to any power.

SIGNIFICANT USER-VISIBLE CHANGES

    o   intensity.ppm
	   Intensity approximation is now available for the Geyer saturation process
	   and the area-interaction process (results of research with Gopalan Nair).

    o   envelope.lpp, envelope.lppm
	   New arguments 'fix.n' and 'fix.marks' allow envelopes to be computed
	   using simulations conditional on the observed number of points.

    o   "[.im"
	   The subset index "i" can now be a linear network (object of class 'linnet').
	   The result of "x[i, drop=FALSE]" is then a pixel image of class 'linim'.

    o   cut.ppp
	   Argument z can be "x" or "y" indicating one of the spatial coordinates.

    o   rThomas, rMatClust, rCauchy, rVarGamma, rPoissonCluster, rNeymanScott
	   New argument 'saveparents'.

    o   lintess
	   Argument 'df' can be missing or NULL, 
	   resulting in a tesellation with only one tile.

    o   lpp
	   X can be missing or NULL, resulting in an empty point pattern.

    o   plot.lintess
	   Improved plot method, with more options.

    o   rpoisline
	   Also returns information about the original infinite random lines.

    o   density.ppp, Smooth.ppp
	   Accelerated.

    o   density.psp
	   New argument 'method' controls the method of computation.
	   New faster option 'method="FFT"'    

    o   nndist.lpp
	   Accelerated.

BUG FIXES

    o   F3est
	   Estimates of F(r) for the largest value of r were wildly incorrect.
	   Fixed.

    o   clip.infline
	   Results were incorrect unless the midpoint of the window
	   was the coordinate origin.
	   Fixed.

    o   integral.linim
	   Results were inaccurate if many of the segment lengths were 
	   shorter than the width of a pixel.
	   Fixed.

    o   predict.lppm
	   Bizarre error messages about 'class too long' or 'names too long'
	   occurred if the model was multitype.
	   Fixed.

    o   superimpose
	   Point patterns containing 0 points were ignored
	   when determining the list of possible marks.
	   Fixed.

    o   chop.tess
	   Vertical lines were not handled correctly 
	   with pixellated tessellations.
	   Fixed.

    o   timed
	   Argument 'timetaken' was ignored.
	   Fixed.    

    o   ppm
	   Crashed if method="logi" and the 'covariates' were a data frame.
	   [Spotted by Kim Colyvas and Ian Renner.]
	   Fixed.

    o   rpoislpp, runiflpp
	   Crashed if nsim > 1.
	   Fixed.

    o   rpoisline
	   Crashed if zero lines were generated.
	   Fixed.

    o   model.frame.ppm
	   Crashed if the original model was fitted to a data frame of covariates
	   and there were NA's amongst the covariate values.
	   [Spotted by Kim Colyvas.]
	   Fixed.

    o   any, all
	   When applied to pixel images (objects of class 'im') the result 
	   was sometimes NA when a finite value should have been returned.
	   Fixed.    

    o   predict.rhohat
	   When the original data were on a linear network,
	   the result of predict.rhohat did not belong to the correct class 'linim'.
	   Fixed.

                 Changes in version 1.47-0 (2016-10-13)                 

OVERVIEW

    o   We thank Marcel Austenfeld, Guy Bayegnak, Tilman Davies, Cenk Icos, 
	   Jorge Mateu, Frederico Mestre, Mehdi Moradi, Virginia Morera Pujol,
	   Suman Rakshit and Sven Wagner for contributions.

    o   Non-Gaussian smoothing kernels.

    o   Important bug fix in linearK, linearpcf

    o   Changed internal format of linnet and lpp objects.

    o   Faster computation in linear networks.

    o   Bias correction techniques.

    o   Bounding circle of a spatial object.

    o   Minkowski sum also applicable to point patterns and line segment patterns.

    o   Option to plot marked points as arrows.

    o   Kernel smoothing accelerated.

    o   Workaround for bug in some graphics drivers affecting image orientation.

    o   Bug fixes and improvements.

    o   Version nickname: 'Responsible Gambler'

NEW FUNCTIONS

    o   anyNA.im
	   Method for 'anyNA' for pixel images.

    o   bc
	   Bias correction (Newton-Raphson) for fitted model parameters. 
	   See also 'rex'.

    o   boundingcircle, boundingcentre
	   Find the smallest circle enclosing a window or point pattern.

    o   "[.linim"
	   Subset operator for pixel images on a linear network.

    o   mean.linim, median.linim, quantile.linim
	   The mean, median, or quantiles of pixel values in a 
	   pixel image on a linear network.

    o   rex
	   Richardson extrapolation for numerical integrals and 
	   statistical model parameter estimates. 

    o   weighted.median, weighted.quantile
	   Median or quantile of numerical data with associated weights.

SIGNIFICANT USER-VISIBLE CHANGES

    o   linear networks
	   The internal format of a 'linnet' (linear network) object
	   has been changed. Existing datasets of class 'linnet' and 'lpp'
	   are still supported. However, computation will be faster if they
	   are converted to the new format. To convert a linnet object L
	   to the new format, use L <- as.linnet(L). To convert an lpp object X 
	   to the new format, use X <- as.lpp(X).

    o   density.ppp, Smooth.ppp
	   New argument 'kernel' allows the user to specify the smoothing kernel.

    o   density.ppp, Smooth.ppp
	   Argument 'weights' can now be a pixel image.

    o   MinkowskiSum, %(+)%
	   Now accepts arguments which are point patterns or line segment patterns
	   as well as windows.

    o   plot.im
	   New argument 'workaround' to avoid a bug in some device drivers
	   that causes the image to be displayed in the wrong spatial orientation.
	   [Thanks to Marcel Austenfeld for drawing attention to this.]

    o   sumouter
	   New argument 'y' allows computation of asymmetric outer products.

    o   linearKinhom, linearpcfinhom
	   New argument 'normpower'.

    o   rmh.default, rmh.ppm
	   New arguments 'nsim', 'saveinfo'.

    o   symbolmap, plot.ppp, plot.lpp
	   New option: shape="arrows" 

    o   rcellnumber
	   New argument 'mu'.

    o   lengths.psp
	   New argument 'squared'.

    o   plot.linfun
	   Now passes arguments to the function being plotted.

    o   as.linnet.psp
	   If the line segment pattern has marks, then the resulting linear network
	   also carries these marks in the $lines component.

    o   summary.owin, summary.im
	   The fraction of frame area that is occupied by the window/image
	   is now reported.

    o   density.ppp, Smooth.ppp
	   Computation accelerated by about 15% 
	   in the case where at='points' and kernel='gaussian'.

    o   linearK, linearpcf
	   Accelerated by about 40%.

    o   pixellate.ppp
	   Accelerated in the case where weights are given

    o   density.ppp
	   Accelerated in the cases where weights are given or 'diggle=TRUE'

    o   dilation.ppp
	   Improved geometrical accuracy.
	   Now accepts arguments to control resolution of polygonal approximation.

    o   discs
	   New argument 'npoly'. 
	   Accelerated in some cases. 

    o   plot.pp3
	   New arguments 'box.front', 'box.back' control plotting of the box.

    o   grow.rectangle
	   New argument 'fraction'.

    o   nnfun.lpp
	   New argument 'k'.

    o   bw.ppl
	   New argument 'sigma'.

    o   lppm
	   New argument 'random' controls placement of dummy points.

    o   rhohat.lpp
	   New argument 'random' controls placement of dummy points.

    o   quadrat.test.ppm
	   Accelerated in the case where the original window is a rectangle.

    o   kppm, mincontrast, cauchy.estpcf, lgcp.estpcf, matclust.estpcf,
	   thomas.estpcf, vargamma.estpcf
	   A warning about infinite values of the summary function 
	   no longer occurs when the default settings are used.

    o   circumradius
	   This function is now deprecated, in favour of 'boundingradius'

    o   print.quad
	   More information is printed.

BUG FIXES

    o   linearK, linearpcf, and relatives:
	   These functions were sometimes greatly underestimated
	   when the network had segments shorter than 10 coordinate units.
	   [Bug introduced in spatstat 1.44-0, december 2015.]
	   Fixed.

    o   integral.linim, integral.linfun
	   Results were slightly inaccurate because of a bias in the
	   distribution of sample points.
	   [Bug introduced in spatstat 1.41-0, february 2015.]
	   Fixed.

    o   intensity.ppm
	   Result was incorrect for Gibbs models if the model was *exactly* 
	   equivalent to a Poisson process (i.e. if all interaction
	   coefficients were exactly zero).
	   [Bug introduced in spatstat 1.28-1, june 2012.]
	   Fixed.

    o   rSSI
	   Sometimes terminated prematurely.
	   [Spotted by Frederico Mestre.]
	   Fixed.

    o   perspPoints
	   Crashed if the image Z contained NA 
	   (i.e. if Z was only defined on a subset of the bounding frame).
	   Spotted by Guy Bayegnak.
	   Fixed.

    o   plot.ppp, plot.lpp
	   Crashed if the argument 'shape' was given.
	   Fixed.

    o   plot.kppm
	   Crashed if the model was not fitted by minimum contrast.
	   Fixed.

    o   superimpose
	   Crashed if the argument was a 'solist' containing line segment patterns.
	   Fixed.

    o   Jest
	   Crashed sometimes, depending on the shape of the observation window.
	   [Spotted by Cenk Icos.]
	   Fixed.

    o   plot.studpermutest
	   Crashed when the summary statistic was a multitype pair correlation 
	   function or multitype K function. [Spotted by Sven Wagner.]
	   Fixed.

    o   pool.anylist
	   Crashed with a message about buffer size,
	   if the list was longer than about 100 items.
	   Fixed.

    o   diagnose.ppm, plot.diagppm
	   Crashed in some cases when cumulative=FALSE.
	   Fixed.

    o   leverage.ppm, influence.ppm, dfbetas.ppm
	   Crashed sometimes with a message about wrong replacement length.
	   [Spotted by Virginia Morera Pujol.]
	   Fixed.

    o   as.linnet.psp
	   Crashed with marked segment patterns, if any segments were very short.
	   [Spotted by Suman Rakshit.]
	   Fixed.

    o   stieltjes
	   Returned NA if some values of f were not finite.
	   Fixed.

    o   plot.symbolmap
	   If a new plot window was initialised, it was sometimes too small
	   to contain the geometric figures (circles, squares etc) in the symbol map.
	   Fixed.

    o   plot.ppp, plot.im
	   Ignored xlim, ylim. 
	   Fixed.

    o   rhohat.lpp
	   Ignored nd, eps.
	   Fixed.

    o   nnfun.lpp
	   Print method gave incorrect information about the point pattern.
	   Fixed.

    o   "[.fv"
	   The default plot formula was not updated.
	   Fixed.

    o   fitted.ppm
	   The result was sometimes a 1-dimensional array rather than a numeric vector.
	   Fixed.

                 Changes in version 1.46-1 (2016-07-08)                 

OVERVIEW

    o   Important bug fix.

    o   Version nickname: 'Spoiler Alert'

BUG FIXES

    o   density.ppp, Smooth.ppp
	   The results of density(X, at="points") and Smooth(X, at="points")
	   were incorrect in some cases. The contribution from the 
	   left-most data point (the point with the smallest x coordinate) 
	   was omitted.   [Bug introduced in spatstat 1.26-0, April 2012.]
	   Fixed.

                       Changes in version 1.46-0                        

OVERVIEW

    o   We thank Corey Anderson and Sebastian Meyer for contributions.

    o   spatstat now depends on R 3.3.0 or later.

    o   Improvements to inhomogeneous multitype K and L functions.

    o   Variance approximation for pair correlation function.

    o   Leverage and influence for multitype point process models.

    o   Functions for extracting components of vector-valued objects.

    o   Important bug fix in Smooth.ppp

    o   Minor improvements and bug fixes.

    o   Version nickname: 'Multidimensional Toothbrush'

NEW FUNCTIONS

    o   split.msr
	   Decompose a measure into parts.

    o   unstack.msr
	   Decompose a vector-valued measure into its component measures.

    o   unstack.ppp, unstack.psp, unstack.lpp
	   Given a spatial pattern with several columns of marks,
	   separate the columns and return a list of spatial patterns, 
	   each having only one column of marks.

    o   kernel.squint
	   Integral of squared kernel, for the kernels used in density estimation.

SIGNIFICANT USER-VISIBLE CHANGES

    o   Kcross.inhom, Kdot.inhom, Kmulti.inhom, Ldot.inhom, Lcross.inhom
	   These functions now allow intensity values to be given by
	   a fitted point process model.
	   New arguments 'update', 'leaveoneout', 'lambdaX'.

    o   diagnose.ppm
	   Infinite values of 'rbord' are now ignored and treated as zero.
	   This ensures that diagnose.ppm has a sensible default
	   when the fitted model has infinite reach.

    o   pcf.ppp
	   Now calculates an analytic approximation to the variance of
	   the estimate of the pair correlation function (when var.approx=TRUE).
	   Now returns the smoothing bandwidth used, as an attribute of the result.

    o   plot.ppp
	   When 'clipwin' is given, any parts of the boundary of the window of x
	   that lie inside 'clipwin' will also be plotted.

    o   plot.msr
	   Now handles multitype measures.
	   New argument 'multiplot'.

    o   plot.anylist
	   If a list entry x[[i]] belongs to class 'anylist', it will be expanded
	   so that each entry x[[i]][[j]] will be plotted as a separate panel.

    o   influence.ppm, leverage.ppm
	   These can now be applied to multitype point process models
	   and the results can be plotted.

    o   plot.influence.ppm, plot.leverage.ppm
	   New argument 'multiplot'.

    o   plot.anylist, plot.solist, plot.listof
	   New arguments panel.begin.args, panel.end.args

    o   influence.ppm, leverage.ppm, dfbetas.ppm
	   For Gibbs models, memory usage has been dramatically reduced, 
	   so the code can handle larger datasets and finer quadrature schemes.

BUG FIXES

    o   Smooth.ppp
	   Results were incorrect when at='points' and leaveoneout=FALSE.
	   [Bug introduced in spatstat 1.20-5, October 2010.]
	   Fixed.

    o   funxy
	   Did not correctly handle one-line functions:
	   the resulting objects evaluated the wrong function in some cases.
	   [Spotted by Sebastian Meyer. Bug introduced in spatstat 1.45-0]
	   Fixed.

    o   mppm
	   Did not recognise the variable 'marks' in a formula.
	   Fixed.

    o   Smooth.ppp, bw.smoothppp
	   Crashed if X had two columns of marks and one column was constant.
	   [Bug introduced in spatstat 1.38-0, October 2014]
	   Fixed.

    o   Smooth.ppp
	   Results for 'at="points"' were garbled, for some values of 'sigma',
	   if X had more than one column of marks.
	   [Bug introduced in spatstat 1.38-0, October 2014]
	   Fixed.

    o   plot.layered
	   Crashed if one layer was a point pattern with several columns of marks.
	   Fixed. 

    o   plot.ppm
	   Sometimes gave a spurious warning about a singular matrix.
	   Fixed.

    o   setminus.owin
	   Gave wrong or strange answer if the correct answer was empty.
	   Fixed.

    o   parameters.dppm
	   Crashed, due to a typo.
	   Fixed.

    o   progressreport
	   Crashed if n = 1. 
	   Fixed.

                 Changes in version 1.45-2 (2016-05-09)                 

OVERVIEW

    o   We thank Ottmar Cronie, Virginia Morera Pujol,
	   Sven Wagner and Marie-Colette van Lieshout for contributions.

    o   Recursive-partition point process models.

    o   Minkowski sum, morphological dilation and erosion with any shape.

    o   Important bug fix in spatial CDF tests.

    o   More bug fixes for replicated patterns.

    o   Simulate a model fitted to replicated point patterns.

    o   Inhomogeneous multitype F and G functions.

    o   Summary functions recognise correction="all"

    o   Leverage and influence code handles bigger datasets.

    o   More support for pixel images.

    o   Improved progress reports.

    o   New dataset 'redwood3'

    o   spatstat now Depends on the package 'rpart'

    o   Version nickname: 'Caretaker Mode'

NEW DATASETS

    o   redwood3
	   A more accurate version of the 'redwood' data.

NEW FUNCTIONS

    o   as.im.data.frame
	   Build a pixel image from a data frame of coordinates and pixel values.

    o   covering
	   Cover a window using discs of a given radius.

    o   dilationAny, erosionAny, %(-)%
	   Morphological dilation and erosion by any shape.

    o   FmultiInhom, GmultiInhom
	   Inhomogeneous multitype/marked versions of the summary functions Fest, Gest.

    o   kernel.moment
	   Moment or incomplete moment of smoothing kernel.

    o   MinkowskiSum, %(+)%
	   Minkowski sum of two windows: A %(+)% B, or MinkowskiSum(A,B)

    o   nobjects
	   New generic function for counting the number of 'things' in a dataset.
	   There are methods for ppp, ppx, psp, tess.

    o   parameters.interact, parameters.fii
	   Extract parameters from interpoint interactions.
	   [These existing functions are now documented.]

    o   ppmInfluence
	   Calculate leverage.ppm, influence.ppm and dfbetas.ppm efficiently.

    o   rppm, plot.rppm, predict.rppm, prune.rppm
	   Recursive-partition point process models

    o   simulate.mppm
	   Simulate a point process model fitted to replicated point patterns.

    o   update.interact
	   Update the parameters of an interpoint interaction.
	   [This existing function is now documented.]

    o   where.max, where.min
	   Find the spatial location(s) where a pixel image achieves its
	   maximum or minimum value.

SIGNIFICANT USER-VISIBLE CHANGES

    o   cdf.test.mppm
	   Now handles Gibbs models.
	   Now recognises covariate="x" or "y".

    o   leverage.ppm, influence.ppm, dfbetas.ppm
	   For Gibbs models, memory usage has been dramatically reduced, 
	   so the code can handle larger datasets and finer quadrature schemes.

    o   plot.im
	   Now handles complex-valued images.

    o   connected.im
	   Now handles a logical-valued image properly.

    o   qqplot.ppm
	   Argument 'expr' can now be a list of point patterns,
	   or an envelope object containing a list of point patterns.

    o   as.layered
	   Default method now handles a (vanilla) list of spatial objects.

    o   summary functions
	   The argument 'correction="all"' is now recognised: it selects
	   all the available options. 
	       This applies to Fest, F3est, Gest, Gcross, Gdot, Gmulti, G3est, Gfox,
	   	Gcom, Gres, Hest, Jest, Jmulti, Jcross, Jdot, Jfox,
	Kest, Kinhom, Kmulti, Kcross, Kdot, Kcom, Kres, 
	Kmulti.inhom, Kcross.inhom, Kdot.inhom, Kscaled, Ksector, Kmark, 
	K3est, Lscaled, markcorr, markcrosscorr,
	nnorient, pairorient, pcfinhom, pcfcross.inhom, pcfcross, pcf, Tstat.

    o   clarkevans
	   The argument 'correction="all"' is now recognised: it selects
	   all the available options. [This is also the default.]

    o   predict.mppm
	   The argument 'type="all"' is now recognised: it selects
	   all the available options. [This is also the default.]

    o   plot.kppm
	   The argument 'what="all"' is now recognised: it selects
	   all the available options. [This is also the default.]

    o   connected.im, connected.owin
	   Arguments '...' now determine pixel resolution.

    o   anova.mppm
	   New argument 'fine'

    o   as.owin.data.frame
	   New argument 'step'

    o   discs
	   Now accepts a single numeric value for 'radii'.

    o   plot.ppp, plot.profilepl, plot.quadratcount, plot.quadrattest, plot.tess
	   Now recognise graphics parameters for text, such as 'family' and 'srt'

    o   as.function.tess
	   New argument 'values' specifies the function values.

    o   cdf.test
	   Calculations are more robust against numerical rounding effects.

    o   progressreport
	   Behaviour improved. New arguments 'tick', 'showtime'.

    o   simulate.ppm
	   New argument 'verbose'

    o   compileK, compilepcf
	   These internal functions are now documented.

BUG FIXES

    o   cdf.test.ppm
	   Calculation of p-values was incorrect for Gibbs models: 
	   1-p was computed instead of p.
	   [Spotted by Sven Wagner.]
	   Fixed.

    o   subfits
	   The interaction coefficients of the submodels were incorrect
	   for Gibbs models with a multitype interaction (MultiStrauss, etc).
	   [Spotted by Sven Wagner.]
	   Fixed.

    o   subfits
	   Crashed when a Gibbs model included factor-valued spatial covariates
	   and not all levels of the factor were present in each row of the data.
	   [Spotted by Sven Wagner.]
	   Fixed.

    o   subfits
	   For Gibbs models with a multitype interaction (MultiStrauss, etc),
	   computation of the conditional intensity caused an error.
	   [Spotted by Sven Wagner.]
	   Fixed.

    o   diagnose.ppm
	   Crashed if what="smooth", when the original window was a rectangle.
	   [Spotted by Virginia Morera Pujol.]
	   Fixed.

    o   mppm
	   The x and y coordinates were not permitted in the 
	   random-effects formula 'random'.
	   [Spotted by Sven Wagner.]
	   Fixed.

    o   vcov.ppm
	   The result had no 'dimnames', if the model was fitted using method="ho".
	   Fixed.

                       Changes in version 1.45-1                        

OVERVIEW

    o   This version was never released.

                 Changes in version 1.45-0 (2016-03-10)                 

OVERVIEW

    o   We thank Monsuru Adepeju, Mario D'Antuono, Markus Herrmann, 
	   Paul Hewson, Kassel Hingee, Greg McSwiggan, Suman Rakshit and Sven Wagner 
	   for contributions.

    o   Important bug fix in leverage/influence diagnostics for Gibbs models.

    o   Numerous bug fixes in code for replicated point patterns.

    o   Surgery on linear networks.

    o   Tessellations on a linear network.

    o   Laslett's Transform.

    o   Colour maps for point patterns with continuous marks are easier to define.

    o   Pair correlation function estimates can be pooled.

    o   Stipulate a particular version of a package.

    o   Fixed namespace problems arising when spatstat is not loaded.

    o   Bug fixes and performance improvements.

    o   spatstat now contains 100,000 lines of R code. 

    o   Version nickname: 'One Lakh'

NEW FUNCTIONS

    o   laslett
	   Laslett's Transform.
	   [Thanks to Kassel Hingee]

    o   lintess
	   Tessellation on a linear network.

    o   divide.linnet 
	   Divide a linear network into pieces demarcated by a point pattern.

    o   insertVertices
	   Insert new vertices in a linear network.

    o   thinNetwork
	   Remove vertices and/or segments from a linear network etc

    o   connected.linnet
	   Find connected components of a linear network.

    o   nvertices, nvertices.linnet, nvertices.owin
	   Count the number of vertices in a linear network 
	   or vertices of the boundary of a window.

    o   as.data.frame.linim, as.data.frame.linfun
	   Extract a data frame of spatial locations and function values
	   from an object of class 'linim' or 'linfun'.

    o   as.linfun, as.linfun.linim, as.linfun.lintess
	   Convert other kinds of data to a 'linfun' object.

    o   requireversion
	   Require a particular version of a package
	   (for use in stand-alone R scripts).

SIGNIFICANT USER-VISIBLE CHANGES

    o   [.linnet, [.lpp
	   New argument 'snip' determines what to do with segments of the network
	   that cross the boundary of the window. 
	   Default behaviour has changed.

    o   pcfinhom
	   Default behaviour is changed when 'lambda' is a fitted model.
	   The default is now to re-fit the model to the data before computing pcf.
	   New arguments 'update' and 'leaveoneout' control this.

    o   envelope methods
	   New argument 'funYargs' contains arguments to the summary function
	   when applied to the data pattern only.

    o   plot.ppp, plot.lpp
	   For a point pattern with continuous marks ('real numbers')
	   the colour arguments 'cols', 'fg', 'bg' can now be vectors of 
	   colour values, and will be used to determine the default colour map
	   for the marks.

    o   symbolmap
	   Now accepts a vector of colour values for the arguments 'col', 'cols',
	   'fg', 'bg' if argument 'range' is given.

    o   closepairs.ppp, closepairs.pp3
	   New arguments 'distinct' and 'neat' allow more options.

    o   closepairs.ppp, closepairs.pp3
	   Argument 'ordered' has been replaced by 'twice'
	   (but 'ordered' is still accepted, with a warning).

    o   closepairs.ppp, closepairs.pp3
	   Performance improved (computation time and memory requirements reduced.)
	   This should improve the performance of many functions in spatstat.

    o   Geyer
	   The saturation parameter 'sat' can now be less than 1.

    o   lpp, as.lpp
	   These functions now handle the case where 'seg' and 'tp' are given
	   but 'x' and 'y' are missing.

    o   linnet
	   If the argument 'edges' is given, then this argument now determines the
	   ordering of the sequence of line segments. For example, the i-th row
	   of 'edges' specifies the i-th line segment in as.psp(L).

    o   funxy, distfun
	   The functions created by funxy and distfun have arguments (x,y).
	   The user may now give a ppp or lpp object for the argument 'x',
	   instead of giving two coordinate vectors 'x' and 'y'.

    o   crossing.psp
	   New argument 'details' gives more information about the intersections
	   between the segments.

    o   subset.ppp, subset.lpp, subset.pp3, subset.ppx
	   The argument 'subset' can now be any argument acceptable to the "[" method.

    o   density.lpp
	   New argument 'weights'.

    o   pcf.ppp
	   New argument 'ratio' allows several estimates of pcf to be pooled.

    o   summary.ppm
	   New argument 'fine' selects the algorithm for variance estimation.

    o   texturemap
	   Argument 'textures' can be missing or NULL.

    o   plot.lpp
	   New argument 'show.network'

    o   linnet
	   New argument 'warn'

    o   mppm
	   Performs more checks for consistency of the input data.

    o   mppm
	   New arguments 'gcontrol' and 'reltol.pql' control the fitting algorithm.

    o   edge.Trans
	   New argument 'gW' for efficiency.

    o   pool.fv
	   The default plot of the pooled function no longer includes 
	   the variance curves.

    o   clickpoly
	   The polygon is now drawn progressively as the user clicks new vertices.

    o   Kest 
	   Accelerated computation (for translation and rigid corrections)
	   when window is an irregular shape.

    o   vcov.ppm, leverage.ppm, influence.ppm, dfbetas.ppm
	   Performance slightly improved, for Gibbs models.

    o   Internal code
	   Performance slightly improved.

    o   Fest, Hest
	   Additional checks for errors in input data.

BUGS

    o   leverage.ppm, influence.ppm, parres.ppm, addvar.ppm
	  Calculations were completely incorrect for Gibbs models, 
	  due to a coding error. 
	  Fixed.

    o   update.kppm
	  If the call to 'update' did not include a formula argument
	  or a point pattern argument, then all arguments were ignored. 
	  Example: update(fit, improve.type="quasi") was identical to 'fit'.
	  Fixed.

    o   diagnose.ppm
	  When applied to a model obtained from subfits(), 
	  in the default case (oldstyle=FALSE) 
	  the variance calculations were incorrect.
	  Consequently the dotted lines representing significance bands were 
	  incorrect. An error or warning about negative variances occurred sometimes.
	  However, calculations with oldstyle=TRUE were correct.
	  The default has now been changed to oldstyle=TRUE for such models.

    o   [.lpp
	  The local coordinate 'seg' was completely incorrect,
	  when 'i' was a window.
	  Fixed.

    o   leverage.ppm, influence.ppm, parres.ppm, addvar.ppm
	  Crashed for Gibbs models in which the coefficient vector had length 1,
	  such as the stationary Hardcore model.
	  Fixed.

    o   subfits
	  Crashed if the model included factor-valued spatial covariates.
	  [Spotted by Sven Wagner]
	  Fixed.

    o   subfits
	  If the model included factor-valued spatial covariates, and if
	  not all levels of the factor were present in each row of the data,
	  the resulting objects were malformed and caused errors in other code.
	  [Spotted by Sven Wagner]
	  Fixed.

    o   subfits
	  Crashed with some random-effects formulas.
	  [Spotted by Sven Wagner]
	  Fixed.

    o   improve.kppm
	  An error message about a missing object 'gminus1' occurred
	  when vcov=TRUE, fast.vcov=FALSE and type="clik1" or "wclik1".
	  Fixed.

    o   plot.profilepl
	  Failed with a message about a missing object 'finite'.
	  Fixed.

    o   selfcut.psp
	  Gave an error if marks(A) was a vector rather than a data frame.
	  [Spotted by Paul Hewson.]
	  Fixed.

    o   suffstat
	  Gave an error for point process models with Geyer interaction.
	  Fixed.

    o   nncross.lpp, distfun.lpp
	  Crashed with obscure errors if Y consisted of a single point.
	  Fixed.

    o   scan.test, scanmeasure
	  Crashed sometimes with an error message from 'grow.mask'.
	  Fixed.

    o   dppm
	  Crashed sometimes with a message that the point pattern could not be found.
	  [Scoping bug.]
	  Fixed.

    o   mppm, profilepl
	  Crashed, with a message about 'SpatstatVersion',
	  if the 'spatstat' package was neither loaded nor attached.
	  [Spotted by Markus Herrmann.]
	  Fixed.

    o   qqplot.ppm
	  Crashed sometimes when applied to a model obtained from subfits().
	  Fixed.

    o   anova.mppm
	  Crashed sometimes with a message about mismatched coefficients.
	  [Spotted by Sven Wagner.]
	  Fixed.

    o   anova.mppm
	  Crashed sometimes with a message about unrecognised option 'type="score"'.
	  [Spotted by Sven Wagner.]
	  Fixed.

    o   split.ppx
	  Crashed if 'f' was not a factor.
	  Fixed.

    o   idw
	  The result was a pixel image defined in the rectangle Frame(X)
	  instead of Window(X). 
	  Fixed.

    o   ppm
	  Parameter estimates were slightly inaccurate 
	  when the model included the Geyer() interaction 
	  and the "isotropic" edge correction was used.
	  Fixed. 

    o   [.ppx
	  Crashed if the number of points selected was less than 2.
	  Fixed.

    o   linnet
	  Crashed if there were no line segments at all.
	  Fixed.

    o   kppm, improve.kppm
	  Crashed if the model was stationary and improve.type != "none".
	  Fixed.

    o   as.linim.default
	  Did not correctly handle factor-valued data.
	  Fixed.

    o   texturemap
	  Crashed if no graphical arguments were specified.
	  Fixed.

    o   vcov.mppm
	  Ignored "..." arguments.
	  Fixed.

    o   Kest
	  If ratio=TRUE and correction=c('border', 'none') 
	  the result did not contain ratio information.
	  Fixed.

    o   plot.ppp, plot.lpp
	  Arguments 'chars' and 'cols' were ignored in some cases.
	  Fixed.

    o   ppm
	  Ignored argument 'emend'.
	  Fixed.

    o   plot.dppm
	  Gave warnings about unrecognised argument 'objectname'.
	  Fixed.

    o   overlap.owin
	  Sometimes returned a very small negative value, 
	  when the correct answer was 0.
	  Fixed.

                 Changes in version 1.44-1 (2015-12-29)                 

OVERVIEW

    o   We thank Brian Ripley for contributions.

    o   Urgent bug fix.

    o   More support for replicated point patterns.

    o   More support for tessellations.

    o   Version nickname: 'Gift Horse'

NEW FUNCTIONS

    o   as.function.tess
	  Convert a tessellation to a function(x,y). The function value
	  indicates which tile of the tessellation contains the point (x,y).

    o   tileindex
	  Determine which tile of a tessellation contains a given point (x,y).

    o   persp.leverage.ppm
	  Method for persp plots for objects of class leverage.ppm

    o   AIC.mppm, extractAIC.mppm
	  AIC for point process models fitted to replicated point patterns.

    o   nobs.mppm, terms.mppm, getCall.mppm
	  Methods for point process models fitted to replicated point patterns.

SIGNIFICANT USER-VISIBLE CHANGES

    o   anova.mppm
	  Now handles Gibbs models, and performs the
	  adjusted composite likelihood ratio test.

    o   update, step
	  These functions now work for models of class 'mppm'.

    o   textureplot
	  Argument x can now be something acceptable to as.im

    o   logLik.mppm
	  New argument 'warn'.

BUGS

    o   nncross.lpp, nnwhich.lpp, distfun.lpp
	 Caused a segmentation fault.
	 [Spotted by Brian Ripley.]
	 Fixed.

    o   anova.ppm
	 If a single 'object' was given, and the object was a Gibbs model,
	 then 'adjust' was effectively set to FALSE.
	 Fixed.

                 Changes in version 1.44-0 (2015-12-23)                 

OVERVIEW

    o   We thank Jonas Geldmann, Andrew Hardegen, Kassel Hingee,
	    Tom Lawrence, Robin Milne, Gopalan Nair, Suman Rakshit, Peijian Shi
	    and Rasmus Waagepetersen for contributions.

    o   More support for multidimensional point patterns and point processes.

    o   More options for envelopes and related Monte Carlo tests.

    o   More support for model comparison.

    o   k-th nearest neighbours on a linear network.

    o   Penttinen process can be simulated (by Metropolis-Hastings or CFTP).

    o   Calculate the predicted variance of number of points.

    o   Convexifying operation for sets.

    o   Subdivide a linear network.

    o   Accelerated algorithms for linear networks.

    o   Quadrat counting accelerated, in some cases.

    o   Version nickname: 'The Sound of One Hand Typing'

NEW FUNCTIONS

    o   rPenttinen
	    Simulate the Penttinen process using perfect simulation.

    o   varcount
	    Given a point process model, compute the predicted variance
	    of the number of points falling in a window.

    o   inside.boxx
	    Test whether multidimensional points lie inside a specified 
	    multidimensional box.

    o   lixellate
	    Divide each segment of a linear network into smaller segments.

    o   nsegments.linnet, nsegments.lpp
	    Count the number of line segments in a linear network.

    o   grow.boxx
	    Expand a multidimensional box.

    o   deviance.ppm, deviance.lppm
	    Deviance for a fitted point process model.

    o   pseudoR2
	    Pseudo-R-squared for a fitted point process model.

    o   tiles.empty
	    Checks whether each tile of a tessellation is empty or nonempty.

    o   summary.linim
	    Summary for a pixel image on a linear network.

SIGNIFICANT USER-VISIBLE CHANGES

    o   rMaternI, rMaternII
	    These functions can now generate random patterns in 
	    three dimensions and higher dimensions, when the argument
	    'win' is of class 'box3' or 'boxx'.

    o   "[.ppx"
	    The subset index 'i' may now be a spatial domain
	    of class 'boxx' or 'box3'.

    o   rmh.ppm, rmhmodel.ppm, simulate.ppm
	  A model fitted using the 'Penttinen' interaction can now be simulated.

    o   rmh.default, rmhmodel.default
	  These functions now recognise cif='penttinen' for the Penttinen interaction.

    o   envelope
	  New argument 'clamp' gives greater control over one-sided envelopes.

    o   dclf.test, mad.test, dclf.progress, mad.progress, 
	    dclf.sigtrace, mad.sigtrace
	  New argument 'clamp' determines the test statistic for one-sided tests.

    o   dclf.progress, mad.progress, dclf.sigtrace, mad.sigtrace,
	   mctest.progress, mctest.sigtrace, dg.progress, dg.sigtrace
	  New argument 'rmin' determines the left endpoint of the test interval.

    o   dclf.test, mad.test, dg.test, dg.progress, dg.sigtrace, dg.envelope
	   (also accepted by dclf.progress, mad.progress, dclf.sigtrace, mad.sigtrace)
	  New argument 'leaveout' specifies how to calculate the deviation
	  between the observed summary function and nominal reference value.

    o   envelope
	  New argument 'funargs'

    o   Hest
	  Argument X can now be a pixel image with logical values.
	  New argument 'W'. [Based on code by Kassel Hingee.]

    o   nncross.lpp, distfun.lpp
	  New argument 'k' allows calculation of k-th nearest neighbour.
	  Computation accelerated.

    o   logLik.ppm
	  New argument 'absolute'.

    o   plot.kppm
	  New arguments 'pause' and 'xname'.

    o   tess
	  Argument 'window' is ignored when xgrid, ygrid are given.

    o   as.polygonal
	  Can now repair errors in polygon data, if repair=TRUE.

    o   rStrauss, rHardcore, rStraussHard, rDiggleGratton, rDGS, rPenttinen
	  New argument 'drop'.

    o   Kest.fft
	  Now has '...' arguments allowing control of spatial resolution.

    o   lppm
	  Computation accelerated.

    o   quadratcount.ppp
	  Computation accelerated in some cases.

    o   dg.test
	  Computation accelerated.

BUGS

    o   runifpointx, rpoisppx
	  Crashed if nsim > 1.
	  Fixed.

    o   triangulate.owin
	  Results were incorrect in some special cases.
	  Fixed.

    o   quadrat.test, clarkevans.test
	  In rare cases, the computed Monte Carlo p-value could have been
	  greater than 1. This could have occurred only when nsim was an even number
	  and when the correct p-value was equal to 1.
	  Fixed.

    o   linearmarkequal
	  Result was a data frame instead of an 'fv' object.
	  Fixed.

    o   point-in-polygon test
	  The function inside.owin could take a very long time to check
	  whether points are inside a polygonal window, if the coordinates
	  were very large numbers. This was due to numerical overflow.
	  (Fixed??)

    o   as.fv.kppm	
	  Crashed if the model was not fitted by minimum contrast.
	  Fixed.

    o   plot.fv
	  Crashed in some obscure cases.
	  Fixed.

    o   collapse.fv
	  Did not allow 'same=NULL'.
	  Fixed.

    o   dclf.progress, mad.progress, dg.progress, 
	    dclf.sigtrace, mad.sigtrace, dg.sigtrace
	  The results could not be re-plotted using a plot formula,
	  because the internal data were slightly corrupted.
	  Fixed.

    o   Kest.fft
	  Result was incorrectly normalised.
	  Fixed.

    o   crosspairs
	  If X and Y were identical point patterns,
	  the result was not necessarily symmetric
	  (on some machines) due to numerical artifacts.
	  Fixed.

    o   plot.fv
	  Lines were not correctly clipped to the plot region when 'ylim' was given.
	  Fixed.

    o   pool.envelope
	  The 'scale' argument was not handled correctly.
	  Fixed.

                 Changes in version 1.43-0 (2015-10-08)                 

OVERVIEW

    o   We thank Leanne Bischof, Christophe Biscio, Belarmain Fandohan,
	  Andrew Hardegen, Frederic Lavancier, Tom Lawrence, Martin Maechler, 
	  Greg McSwiggan, Robin Milne, Gopalan Nair, Tuomas Rajala, 
	  Suman Rakshit, Ben Ramage, Francois Semecurbe and Ida-Maria Sintorn 
	  for contributions.

    o   spatstat now depends on the package 'nlme'.

    o   spatstat now depends on R 3.2.2 or later.

    o   Simulation algorithms have been accelerated; simulation outcomes 
	  are *not* identical to those obtained from previous versions of spatstat. 

    o   Determinantal point process models.

    o   Random-effects and mixed-effects models for replicated patterns.

    o   Dao-Genton test, and corresponding simulation envelopes.

    o   Simulated annealing and simulated tempering.

    o   spatstat colour tools now handle transparent colours.

    o   Improvements to "[" and subset() methods

    o   Extensions to kernel smoothing on a linear network.

    o   Support for one-dimensional smoothing kernels.

    o   Bug fix in Metropolis-Hastings simulation.

    o   Mark correlation function may include weights.

    o   Cross-correlation version of the mark correlation function.

    o   Variance calculations for replicated patterns.

    o   Penttinen pairwise interaction model.

    o   Contour plots with colours determined by a colour map.

    o   New dataset: Australian states and territories.

    o   More support for multi-dimensional point patterns.

    o   Minor improvements and bug fixes.

    o   Version nickname: "Mixed Effects"

NEW DATASET

    o   austates
	  The states and large mainland territories of Australia
	  represented as polygonal regions forming a tessellation.

NEW FUNCTIONS

    o   dppm
	  Fit a determinantal point process model to point pattern data.

    o   fitted.dppm, predict.dppm, intensity.dppm
	  Predict a fitted dppm object.

    o   logLik.dppm, AIC.dppm, extractAIC.dppm, nobs.dppm
	  Likelihood and AIC for determinantal point process models
	  (enabling the use of 'step')

    o   coef.dppm, formula.dppm, print.dppm, terms.dppm, labels.dppm,
	  model.frame.dppm, model.matrix.dppm, model.images.dppm,
	  is.stationary.dppm, reach.dppm, unitname.dppm, unitname<-.dppm, Window.dppm
	   Various methods for dppm objects.

    o   parameters.dppm
	  Extract meaningful list of model parameters

    o   objsurf.dppm
	  Objective function surface of a dppm object

    o   residuals.dppm
	  Residual measure for a dppm object.

    o   dppBessel, dppCauchy, dppGauss, dppMatern,	dppPowerExp
	  Determinantal Point Process models.

    o   update.dppmodel            
	  Set parameter values in a dpp model.

    o   is.stationary.dppmodel, print.dppmodel, reach.dppmodel, valid.dppmodel    
	  Basic information about a dpp model

    o   rdpp, simulate.dppmodel		 
	  Simulation of a dpp model.

    o   intensity.dppmodel, Kmodel.dppmodel, pcfmodel.dppmodel
	  Moments of a dpp model

    o   dim.dppmodel, dppapproxkernel, dppapproxpcf, dppeigen, dppfamily,
	  dppkernel, dppparbounds, dppspecdenrange, dppspecden
	  Helper functions for dpp models.

    o   dclf.sigtrace, mad.sigtrace, mctest.sigtrace
	  Significance trace of Monte Carlo test

    o   dg.test
	  Dao-Genton adjusted Monte Carlo goodness-of-fit test.

    o   dg.envelope
	  Simulation envelopes corresponding to Dao-Genton test.

    o   dg.sigtrace
	  Significance trace for Dao-Genton test

    o   dg.progress
	  Progress plot for Dao-Genton test

    o   markcrosscorr
	  Mark cross-correlation function for point patterns with
	  several columns of marks

    o   fixef.mppm, ranef.mppm
	  Extract fixed effects and random effects from a point process model
	  fitted to replicated point patterns.

    o   rtemper
	  Simulated annealing or simulated tempering.

    o   to.opaque, to.transparent
	  Change transparency value in colours

    o   rgb2hsva
	  Convert RGB to HSV data, like rgb2hsv, but preserving transparency.

    o   superimpose.ppplist, superimpose.splitppp
	  New methods for 'superimpose' for lists of point patterns.

    o   dkernel, pkernel, qkernel, rkernel
	  Probability density, cumulative probability, quantiles
	  and random generation from distributions used in basic one-dimensional
	  kernel smoothing.

    o   kernel.factor
	  Auxiliary calculations for one-dimensional kernel smoothing.

    o   PPversion, QQversion
	  Transformation of a summary function to its P-P or Q-Q counterpart.

    o   spatdim
	  Spatial dimension of any object in the spatstat package.

    o   as.boxx
	  Convert data to a multi-dimensional box.

    o   intensity.ppx
	  Method for 'intensity' for multi-dimensional space-time point patterns.

    o   fourierbasis
	  Evaluate Fourier basis functions in any number of dimensions.

    o   valid
	  New generic function, with methods valid.ppm, valid.lppm, valid.dppmodel

    o   emend, emend.ppm, emend.lppm
	  New generic function with methods for ppm and lppm.
	  emend.ppm is equivalent to project.ppm

    o   Penttinen
	  New pairwise interaction model.

    o   quantile.density
	  Calculates quantiles from kernel density estimates.

    o   CDF.density
	  Calculates cumulative distribution function from kernel density estimates.

SIGNIFICANT USER-VISIBLE CHANGES

    o   simulation
	  Several basic simulation algorithms have been accelerated.
	  Consequently, simulation outcomes are not identical to 
	  those obtained with previous versions of spatstat, even when the
	  same random seed is used. To ensure compatibility with previous
	  versions of spatstat, revert to the slower code by setting
	  spatstat.options(fastthin=FALSE, fastpois=FALSE).

    o   mppm
	  Now handles models with a random effect component.
	  New argument 'random' is a formula specifying the random effect.

    o   vcov.mppm
	  Now handles models with Gibbs interactions.

    o   [.ppp
	  New argument 'clip' determines whether the window is clipped.

    o   [.ppp
	  The previously-unused argument 'drop' now determines whether 
	  to remove unused levels of a factor.

    o   [.pp3, [.lpp, [.ppx, subset.ppp, subset.pp3, subset.lpp, subset.ppx
	  These methods now have an argument 'drop' which determines
	  whether to remove unused levels of a factor.

    o   density.lpp
	  Now supports both the 'equal-split continuous' and 
	  'equal-split discontinuous' smoothers. New argument 'continuous' 
	  determines the choice of smoother.

    o   envelope
	  New argument 'scale' allows global envelopes to have 
	  width proportional to a specified function of r,
	  rather than constant width.

    o   dclf.test, mad.test, dclf.progress, mad.progress, mctest.progress
	  New argument 'scale' allows summary function values to be rescaled
	  before the comparison is performed.

    o   dclf.test, mad.test
	  New argument 'interpolate' supports interpolation of p-value.

    o   dclf.progress, mad.progress, mctest.progress
	  New argument 'interpolate' supports interpolation of critical value of test.

    o   simulate.ppm
	  New argument 'w' controls the window of the simulated patterns.

    o   default.rmhcontrol, default.rmhexpand
	  New argument 'w'.

    o   markcorr
	  New argument 'weights' allows computation of the weighted version
	  of the mark correlation function.

    o   density.lpp
	  New argument 'kernel' specifies the smoothing kernel.
	  Any of the standard one-dimensional smoothing kernels can be used.

    o   contour.im
	  New argument 'col' specifies the colour of the contour lines.
	  If 'col' is a colour map, then the contours are drawn in different colours.

    o   plot.ppp
	  The default colour for the points is now a transparent grey,
	  if this is supported by the plot device.

    o   rgbim, hsvim
	  New argument 'A' controls the alpha (transparency) channel.

    o   rgb2hex, col2hex, paletteindex, is.colour, samecolour,
	  complementarycolour, is.grey, to.grey
	  These colour tools now handle transparent colours.

    o   rgb2hex
	  New argument 'maxColorValue'

    o   to.grey
	  New argument 'transparent'.

    o   progressreport
	  New argument 'state'
	  New option: style="tk"

    o   rLGCP
	  This function no longer requires the package 'RandomFields'
	  to be loaded explicitly. 

    o   kppm
	  Fitting a model with clusters="LGCP" no longer requires the
	  package 'RandomFields' to be loaded explicitly.

    o   rpoispp
	  Accelerated, when 'lambda' is a pixel image.

    o   rthin
	  Accelerated, when 'P' is a single number.

    o   spatstat.options
	  New options 'fastthin' and 'fastpois' enable fast simulation algorithms.
	  Set these options to FALSE to reproduce results obtained with
	  previous versions of spatstat.

    o   split.ppp
	  The splitting variable 'f' can now be a logical vector.

    o   collapse.fv
	  This is now treated as a method for the 'nlme' generic 'collapse'.
	  Its syntax has been adjusted slightly.

    o   diagnose.ppm, plot.diagppm
	  New arguments col.neg, col.smooth control the colour maps.

    o   valid.ppm
	  This is now a method for the generic function 'valid'.

    o   ppm.ppp, ppm.quad
	  New argument 'emend', equivalent to 'project'.

    o   "[<-.im"
	  Accepts an array for 'value'.

    o   as.im.function
	  New argument 'strict'.

    o   bw.ppl
	  New argument 'weights'.

    o   plot.mppm
	  New argument 'se'.

    o   dclf.test, mad.test
	  Formal arguments 'use.theo' and 'internal' have been removed.

    o   predict.kppm, residuals.kppm
	  Now issues a warning when the calculation ignores the 
	  cluster/Cox component and treats the model as if it were Poisson.
	  (This currently happens in predict.kppm when se=TRUE or interval != "none",
	  and in residuals.kppm when type != "raw").

BUG FIXES

    o   lpp
	  Crashed if X was a 4-column matrix.
	  Fixed.

    o   plot.fv
	  Crashed with some graphics devices, if legend=TRUE.
	  Fixed.

    o   effectfun
	  Crashed if 'covname' was missing.
	  Fixed.

    o   rVarGamma, rMatClust, rThomas, rCauchy, rNeymanScott
	  Crashed if 'kappa' was a function or image instead of a single number.
	  [Spotted by Ben Ramage.]
	  Fixed.

    o   plot.mppm
	  Crashed with a message about "figure margins too large"
	  unless the argument se=FALSE was given explicitly.
	  Fixed.

    o   opening.owin, closing.owin
	  Crashed sometimes, with a message about a rectangle not containing a window.
	  Fixed.

    o   persp.im
	  Crashed if all pixel values were equal to zero (unless zlim was given).
	  Fixed.

    o   predict.ppm
	  Crashed sometimes if the model was fitted with use.gam=TRUE.

    o   as.linim.linfun
	  Generated an error ('L must be a linear network')
	  if extra arguments were given.

    o   as.function.fv
	  Generated an error when executed in the 'covr' package.
	  Fixed.

    o   rmh, simulate.ppm
	  Results were incorrect for inhomogeneous multitype models
	  simulated with fixall=TRUE (i.e. prescribing a fixed number of
	  points of each type) if the model was segregated 
	  (i.e. if different types of points had different first order trend).
	  Fixed.

    o   dclf.progress, mad.progress
	  Ignored the argument 'alternative'. 
	  Fixed.

    o   $<-.hyperframe, [<-.hyperframe
	  Result was garbled if 'value' was a hyperframe with one column.

    o   rmh.ppm
	  Argument 'w' was ignored in some cases.
	  Fixed.

    o   Hest
	  There was an artefact at r=0 when conditional=TRUE.
	  Fixed.

    o   [.msr
	  The result of M[W] where W is a window
	  was a measure with window W, instead of intersect.owin(W, Window(M)).
	  Fixed.

    o   pool.envelope
	  Did not always respect the value of 'use.theory'.
	  Fixed.

    o   envelope, pool.envelope
	  If 'ginterval' was given, the results were in a slightly incorrect format.
	  Fixed.

    o   pool.envelope
	  Did not check for compatible values of 'ginterval'.
	  Fixed.

                 Changes in version 1.42-2 (2015-06-29)                 

OVERVIEW

    o   We thank Bob Klaver and Harold-Jeffrey Ship for contributions.

    o   Improvements to simulation of Neyman-Scott processes.

    o   Improvements to fitting of Neyman-Scott models.

    o   Extended functionality for pixel images.

    o   Fitted intensity on linear network

    o   Triangulation of windows.

    o   Corrected an edge correction.

    o   Bug fixes and performance improvements.

    o   Nickname: 'Barking at Balloons'

NEW FUNCTIONS

    o   triangulate.owin
	  Decompose a spatial window into triangles.

    o   fitted.lppm
	  Fitted intensity values for a point process on a linear network.

SIGNIFICANT USER-VISIBLE CHANGES

    o   rThomas, rMatClust, rCauchy, rVarGamma
	  When the model is approximately Poisson, it is simulated using rpoispp. 
	  This avoids computations which would require huge amounts of memory. 
	  New argument 'poisthresh' controls this behaviour.

    o   update.kppm
	  Now handles additional arguments in any order, with or without names.
	  Changed arguments. Improved behaviour.

    o   kppm, clusterfit
	  New argument 'algorithm' specifies the choice of optimisation algorithm.

    o   kppm
	  Left hand side of formula can now involve entries in the list 'data'.

    o   rotmean
	  New argument 'padzero'. 
	  Default behaviour has changed.

    o   rose.default
	  New argument 'weights'.

    o   rose
	  New arguments 'start' and 'clockwise' specify the convention
	  for measuring and plotting angles.

    o   padimage 
	  New argument 'W' allows an image to be padded out to fill any window.

    o   union.owin
	  Improved behaviour when there are more than 2 windows.

    o   clusterset
	  Improved behaviour.

    o   affine.owin
	  Allows transformation matrix to be singular, if the window is polygonal.

BUG FIXES

    o   spatstat
	  spatstat could not be installed on some 64-bit VM systems
	  because of an apparent bug in R.
	  Fixed.

    o   rThomas, rMatClust, rCauchy, rVarGamma
	  Large values of the scale parameter could cause the algorithm to freeze
	  or require huge amounts of memory.
	  Fixed.

    o   pcf, pcfinhom
	  Crashed if the point pattern was empty.
	  Fixed.

    o   plot.fv
	  Gave an error message if all 'y' values were equal, when legend=TRUE.
	  Fixed.

    o   rose.default
	  Display was incorrect when unit="radian".
	  Fixed.

    o   Kest
	  Ohser-Stoyan rigid motion correction (correction='rigid')
	  was calculated incorrectly at large distances.
	  Fixed.

    o   summary.im
	  Issued a warning about numerical overflow in some cases.
	  [Spotted by Bob Klaver.]
	  Fixed.

    o   plot.im
	  Sometimes warned that 'box' is not a graphical parameter.
	  Fixed.

                 Changes in version 1.42-1 (2015-06-05)                 

OVERVIEW

    o   We thank Andrew Hardegen, Tom Lawrence, Robin Milne, Suman Rakshit,
	  and Brian Ripley for contributions.

    o   Urgent bug fix.

    o   More robust simulation of cluster processes.

    o   Slightly accelerated.

    o   Version nickname: 'Vogon Poetry'

NEW FUNCTIONS

    o   boundingbox.solist
	  Method for boundingbox for lists of spatial objects.

SIGNIFICANT USER-VISIBLE CHANGES

    o   rThomas, rMatClust, rCauchy, rVarGamma, rNeymanScott
	  New faster algorithm which is more robust against extreme values of
	  the parameters.

    o   rNeymanScott
	  New argument 'nonempty' controls choice of algorithm.

    o   solist, as.solist
	  Accelerated. 

    o   as.list.hyperframe
	  Accelerated. 

BUG FIXES

    o   residuals.mppm
	  Brought some computers to a grinding halt, due to the bug in solist().
	  Fixed.

    o   solist, as.solist
	  In rare cases, the format was corrupted, or the algorithm never terminated.
	  Fixed.

                 Changes in version 1.42-0 (2015-06-01)                 

OVERVIEW

    o   We thank Anders Bilgrau, Ute Hahn, Jack Hywood, Tuomas Rajala,
	  Cody Schank, Olivia Semboli and Ben Taylor for contributions.

    o   Version nickname: 'Life, The Universe and Everything'

    o   Permutation test for difference between groups of point patterns.

    o   Variational Bayes estimation for point process models.

    o   Score test in anova.ppm

    o   ROC curve, and discrimination index AUC, for fitted models.

    o   Interactive text editor for spatial datasets.

    o   Tools for analysing data on a tree. 

    o   Kernel density/intensity estimation on a linear network.

    o   Random pixel noise.

    o   Improved behaviour of polygon geometry operations.

    o   Improved support for cluster and Cox models.

    o   Improved basic support for owin objects.

    o   Improved support for tessellations.

    o   More hierarchical Gibbs interactions.

    o   Modifications to Kest.

    o   summary method for Cox and cluster models.

    o   class 'listof' is almost completely replaced by 'anylist' and 'solist'.

    o   Improvements and bug fixes.

    o   spatstat now depends on R version 3.2.0 or later.

NEW FUNCTIONS

    o   studpermu.test
	  Studentised permutation test for difference between groups of point patterns.
	  Generously contributed by Ute Hahn.

    o   AIC.kppm, extractAIC.kppm, logLik.kppm, nobs.kppm
	  Methods for computing AIC for fitted Cox and cluster models.

    o   transmat
	  Convert pixel arrays between different display conventions.

    o   roc
	  Receiver Operating Characteristic curve.

    o   auc
	  Discrimination index AUC (area under the ROC curve) 

    o   edit.ppp, edit.psp, edit.im
	  Interactive text editor works for spatial datasets.

    o   edit.hyperframe
	  Interactive text editor works for hyperframes.

    o   parameters
	  Extract all parameters from a fitted model.

    o   density.lpp
	  Kernel estimation of point process intensity on a linear network.

    o   extractbranch, deletebranch, treeprune, treebranchlabels, begins
	  Tools for analysing data on a tree.

    o   rnoise
	  Random pixel noise.

    o   as.data.frame.owin
	  Convert a window to a data frame.

    o   harmonise.owin
	  Convert several binary mask windows to a common pixel grid.

    o   copyExampleFiles
	  Copy the raw data files from an installed dataset
	  to a chosen folder, for use in a practice exercise.

    o   density.ppplist
	  Method for 'density' for lists of point patterns.

    o   inradius
	  Radius of largest circle inside a window.

    o   mergeLevels
	  Merge different levels of a factor.

    o   relevel.im, relevel.ppp, relevel.ppx
	  Change the reference level of a factor.

    o   simulate.profilepl
	  simulation method for models fitted by profile maximum pseudolikelihood.

    o   predict.rho2hat
	  Prediction method for class rho2hat

    o   with.msr
	  Evaluate (an expression involving) components of a measure. 

    o   summary.kppm, print.summary.kppm, coef.summary.kppm
	  Methods for 'summary' and 'coef(summary(..))' for Cox and cluster models.

    o   as.im.funxy
	  Method for as.im for class funxy.

    o   shift.linim, scalardilate.linim, affine.linim
	  Geometrical transformations for 'linim' objects.

    o   Smooth.solist
	  Smooth method for a list of spatial objects.

    o   unitname.tess, unitname<-.tess
	  Tessellations now keep track of the name of the unit of length.

    o   dirichletAreas
	  Faster algorithm for tile.areas(dirichlet(X)).

    o   identify.lpp
	  Method for 'identify' for point patterns on a linear network.

    o   HierStraussHard, HierHard
	  Hierarchical interactions for Gibbs models.

    o   delaunayDistance, delaunayNetwork, dirichletEdges, 
	  dirichletNetwork, dirichletVertices, dirichletWeights
	     These functions will replace delaunay.distance, delaunay.network, 
	  dirichlet.edges, dirichlet.network, dirichlet.vertices and
	  dirichlet.weights respectively.
	  The latter are now 'deprecated'.

SIGNIFICANT USER-VISIBLE CHANGES

    o   ppm
	  Now supports Variational Bayes fitting method.

    o   kppm
	  'AIC' and 'step' now work for kppm objects
	  fitted using maximum Palm likelihood.

    o   kppm
	  The default for the weight function 'weightfun' has been changed, 
	  for better performance.

    o   envelope
	  envelope methods now have argument 'use.theory' specifying whether
	  to use the 'theoretical' value of the summary function when constructing
	  simultaneous envelopes.

    o   anova.ppm
	  Now performs the Score Test, for Poisson models only,
	  if argument test="Rao" or test="score".

    o   Kest
	  New argument 'rmax' controls maximum value of argument 'r'

    o   diagnose.ppm
	  Now computes and prints the null standard deviation of the
	  smoothed Pearson residual field, when appropriate.

    o   nncorr, nnmean, nnvario
	  New argument 'k' specifies k-th nearest neighbour.

    o   quadrat.test.ppp, quadrat.test.quadratcount
	  New argument 'lambda' supports a test of the Poisson process 
	  with given intensity 'lambda'.

    o   clickpoly, clickbox
	  These functions now handle graphical arguments to polygon()
	  when drawing the resulting polygon or rectangle.

    o   owin, as.owin, as.mask
	  owin(mask=D) or as.owin(D) or as.mask(D) will produce a binary mask window
	  if D is a data frame with two columns of (x,y) coordinates
	  or a data frame with three columns containing (x,y,logical).

    o   as.owin.data.frame
	  W can now be a data frame with only two columns,
	  giving the spatial coordinates of the pixels that are inside the window.

    o   rose
	  Tick marks now have labels showing the angle (in degrees or radians).

    o   distcdf
	  New argument 'regularise' determines whether values at short distances
	  will be smoothed to avoid discretisation artefacts.

    o   rpoislinetess
	  Return value now has an attribute 'lines' giving the 
	  realisation of the Poisson line process.

    o   intersect.owin, union.owin, setminus.owin
	  New argument 'p' controls resolution of polygon clipping algorithm.

    o   intersect.owin, union.owin
	  Arguments may be lists of windows, of class 'solist'.
	  Formal arguments A and B have been removed.

    o   superimpose
	  Now handles lists of point patterns 
	  (objects of class 'ppplist' or 'splitppp')

    o   density.ppp
	  New argument 'positive' allows the user to stipulate that
	  density values must be positive (avoiding numerical errors
	  which occasionally produce small negative values).

    o   adaptive.density
	  Now accepts f = 0 (uniform intensity estimate) and
	  f = 1 (Voronoi intensity estimate) as well as 0 < f < 1.
	  Algorithm accelerated.

    o   rSSI
	  Can now generate inhomogeneous patterns.

    o   effectfun
	  Now works for 'kppm' and 'lppm' objects as well.

    o   integral.im, integral.msr
	  Argument 'domain' can now be a tessellation;
	  the integral over each tile of the tessellation is returned.

    o   allstats, compareFit, markcorr, split.ppx, by.ppp
	  Result is now of class 'anylist'.

    o   by.im, density.splitppp, idw, model.images, nnmark, pixellate.ppp,
	  predict.lppm, predict.ppm, quadratcount.splitppp, quadratresample, relrisk, 
	  Smooth.msr, split.im, tiles
	  Result is now of class 'solist'.

    o   split.ppp
	  New argument 'reduce'.
	  Result now inherits class 'ppplist' and 'solist', as well as 'splitppp'

    o   rLGCP
	  New argument 'nsim' allows multiple patterns to be generated.

    o   alltypes
	  New argument 'reuse' determines whether all simulation envelopes
	  are based on the same set of simulated patterns, or on independent sets.

    o   rpoispp, runifpoint
	  New argument 'ex' makes it possible to generate a random pattern
	  similar to an example point pattern.

    o   effectfun
	  Argument 'covname' is not needed if the model has only one covariate.

    o   quadratcount
	  Argument 'tess' can now be anything acceptable to as.tess.

    o   tess
	  New argument 'unitname' specifies the name of the unit of length.
	  If it is missing, unitname information will be extracted from the
	  other data.

    o   intersect.tess, chop.tess, quadrats
	  Results of these functions now have the same 'unitname' as their input.

    o   persp.im, nnclean, plot.qqppm, plot.bw.optim
	  These plotting functions now obey spatstat.options('monochrome')

    o   lurking
	  Now returns an object of class 'lurk' which has a plot method.
	  Two-standard-deviation limits are now plotted using grey shading.

    o   marktable
	  New argument 'N' for studying the N nearest neighbours.   
	  New argument 'collapse' for manipulating the contingency table.

    o   harmonise.fv
	  Now discards columns with names which do not match.

    o   eval.fv
	  New argument 'equiv' can be used to declare that two columns
	  with different names in different objects are equivalent.

    o   quantile.ewcdf
	  New argument 'type' controls the type of quantile.

    o   plot.imlist
	  New argument 'plotcommand' specifies how to plot each image.

    o   persp.im
	  The lower extent of the apron can now be controlled by 'zlim'.

    o   quadscheme
	  Argument 'method' is partially matched.

    o   Kdot, Ldot
	  New argument 'from' is an alternative to 'i'.

    o   Kcross, Lcross
	  New arguments 'from' and 'to' are alternatives to 'i' and 'j' respectively.

    o   varblock
	  Changed the ordering (and therefore default colours/styles) 
	  of curves in the plot, to match other functions like lohboot.

    o   bw.diggle
	  New argument 'nr' controls accuracy.

    o   textureplot
	  Now accepts a pixel image, a tessellation, or anything acceptable to as.tess.

    o   textureplot
	  Line spacing in legend now matches line spacing in main display.

    o   [.tess
	  Subset index can now be a window.

    o   plot.tess
	  Can now plot a text label in each tile.

    o   plot.tess
	  New argument 'do.plot'.

    o   MultiHard, MultiStrauss, MultiStraussHard, HierStrauss
	  Printed output of fitted model now respects spatstat.options('terse').

    o   print.ppm
	  Reduced redundancy in output in some cases.

    o   print.msr
	  Responds better to spatstat.options('terse').

    o   print.ppm, print.fii, print.interact
	  Irregular parameters are now printed to the number of significant figures
	  specified by options("digits").

    o   square
	  New argument 'unitname'.

    o   plot.fv
	  Return value is now invisible.

    o   delaunay.distance, delaunay.network, dirichlet.edges, 
	  dirichlet.network, dirichlet.vertices
	     These functions are now 'deprecated', and will be replaced by
	     delaunayDistance, delaunayNetwork, dirichletEdges, 
	     dirichletNetwork and dirichletVertices respectively.

    o   data(residualspaper)
	  In the real datasets (Fig1 and Fig11), the name of the unit of length
	  has now been recorded.

    o   rLGCP
	  This function now requires the package 'RandomFields'
	  to be loaded explicitly by library(RandomFields) or require(RandomFields), 
	  unless model="exp".

    o   iplot, istat
	  These functions now require the package 'rpanel' 
	  to be loaded explicitly by library(rpanel) or require(rpanel).

    o   ppm, quadscheme
	  Improved calculation of Dirichlet weights.

    o   countends
	  New argument 'toler' controls numerical errors

    o   diagnose.ppm
	  Improved handling of additional graphics arguments.

    o   pcf3est
	  Mathematical labels changed.

    o   plot.hyperframe
	  Default margin spacing has been increased.

BUG FIXES

    o   Kinhom, Linhom
	  The value of 'theo' was erroneously rescaled 
	  by a small amount, when renormalise=TRUE (the default).
	  Fixed.

    o   Kmark
	  Values were erroneously rescaled.
	  Fixed.

    o   union.owin
	  Strange results were sometimes obtained when taking the union 
	  of more than two windows.
	  Fixed.

    o   rpoispp3 
	  Implementation was incorrect for nsim > 1.
	  (Results may have been incorrect.)
	  Spotted by Jack Hywood.
	  Fixed.

    o   as.owin.data.frame
	  Crashed if the window was not connected.
	  Fixed.

    o   Frame<-
	  Crashed when applied to a binary mask.
	  Fixed.

    o   rho2hat
	  Crashed if cov1="x" and cov2="y".
	  Fixed.

    o   as.mask
	  Crashed sometimes when only the argument 'xy' was given.
	  Fixed.

    o   ppm
	  Crashed (rarely) when method='ho' if the simulated pattern was empty.
	  Fixed.

    o   istat, iplot
	  Crashed in recent versions of rpanel.
	  Fixed.

    o   convexhull
	  Crashed if applied to a 'psp' object.
	  Fixed.

    o   plot.ppm
	  Crashed with message about 'variable lengths differ'.
	  Fixed.

    o   plot.solist
	  Crashed when applied to a list of point patterns
	  if some patterns had more than one column of marks.
	  Fixed.

    o   Smooth.ppp
	  Crashed if applied to a point pattern with several columns of marks
	  if some of the columns were factors.
	  Fixed.

    o   runifpoint3, rpoispp3
	  Crashed if nsim > 1.
	  Spotted by Jack Hywood.
	  Fixed.

    o   hist.im
	  Crashed if argument 'freq' was given.
	  Fixed.

    o   MultiStraussHard
	  Generated misleading error messages (e.g. 'model is invalid') 
	  when arguments 'iradii' and 'hradii' did not have the same pattern of NA's.
	  Fixed.

    o   plot.solist
	  Figures were sometimes aligned incorrectly 
	  when the argument 'panel.args' was given.
	  Fixed.

    o   scaletointerval
	  Results sometimes fell slightly outside the desired interval
	  due to numerical error.
	  Fixed.

    o   plot.solist
	  Behaved incorrectly when plotcommand='persp'.
	  Fixed.

    o   "[.hyperframe"
	  Sometimes returned an 'anylist' when it should have returned a 'solist'.
	  Fixed.

    o   plot.im
	  Did not plot surrounding frame box when ribbon=FALSE.
	  Fixed.

    o   envelope
	  The functions stored when savefuns=TRUE did not inherit 
	  the correct name for the unit of length.
	  Fixed.

    o   print.ppm, print.fii, print.interact
	  Layout was misaligned.
	  Fixed.

    o   plot.plotppm
	  Paused for input when it was not appropriate.
	  Fixed.

    o   plot.fv
	  On png devices, the legend box was drawn with a white background,
	  obscuring the main plot. 
	  Fixed.

    o   plot.owin, plot.ppp, plot.im
	  There was unnecessary extra space above the main title.
	  Fixed.

    o   plot.rho2hat
	  Colour map ribbon was drawn but not annotated.
	  Fixed.

    o   density.splitppp, density.ppplist
	  Format was out of order if se=TRUE.
	  Fixed.

    o   MultiStraussHard
	  project.ppm sometimes yielded a model that was still invalid.
	  Fixed.

                 Changes in version 1.41-1 (2015-02-27)                 

OVERVIEW

    o   This is identical to the major release 1.41-0 except for
	   minor bug fixes. The change log for 1.41-0 is repeated here
	   with minor modifications.

    o   Version nickname: 'Ides of March'

    o   We thank Ahmed El-Gabbas, Ute Hahn, Aruna Jammalamadaka,
	  Ian Renner, Brian Ripley, Torben Tvedebrink and Sasha Voss 
	  for contributions.

    o   Fixed a bug causing a segmentation fault.

    o   Standard errors for kernel estimates of intensity.

    o   Test for segregation.

    o   Tessellations may now have marks.

    o   Nested splitting.

    o   More support for cluster models. Reorganised parametrisation.

    o   Sparse data representation of linear networks.

    o   More support for data on a linear network.

    o   New datasets: 'spiders' and 'dendrite'.

    o   Improvements and bug fixes.

    o   spatstat no longer uses Fortran.

    o   spatstat no longer depends on the package 'scatterplot3d'.

    o   spatstat now imports (rather than 'suggests') the Matrix package.

NEW DATASETS

    o   dendrite
	  Dendritic spines on the dendrite network of a neuron.
	  A point pattern on a linear network.
	  Generously contributed by Aruna Jammalamadaka.

    o   spiders
	  Spider webs on the mortar lines of a brick wall.
	  A point pattern on a linear network.
	  Generously contributed by Sasha Voss.

NEW FUNCTIONS

    o   segregation.test
	  Test of spatial segregation of types in a multitype point pattern.

    o   clusterfield, clusterkernel
	  Compute the cluster kernel (offspring density) of a cluster process model,
	  or compute the cluster field generated by superimposing copies 
	  of the cluster kernel at specified locations.

    o   clusterradius
	  Compute the radius of the support of the offspring density
	  of a cluster process model. 

    o   as.linnet.psp
	  Convert a line segment pattern to a linear network
	  by guessing the connectivity using a distance threshold.

    o   iplot.linnet, iplot.lpp
	  Methods for interactive plotting 'iplot' for objects of class lpp and linnet.

    o   Mathematical operations are now supported for pixel images
	  on a linear network. See help(Math.linim)

    o   dirichlet.network, delaunay.network
	  The linear networks formed by the Dirichlet tessellation 
	  and Delaunay triangulation.

    o   dirichlet.edges
	  The edges of the Dirichlet tessellation.

    o   selfcut.psp
	  Cut line segments where they cross each other.

    o   vertices.linnet
	  Extract the vertices (nodes) of the linear network.

    o   vertexdegree
	  Compute the degree of each vertex in a linear network.

    o   pixellate.linnet
	  Pixellate a linear network.

    o   subset.hyperframe
	  'subset' method for class 'hyperframe'.

    o   head.hyperframe, tail.hyperframe
	  'head' and 'tail' methods for hyperframes.

    o   clickdist
	  Measures the distance between two spatial locations clicked by the user.

    o   solapply, anylapply
	  wrappers for 'lapply' which return a list of class 'solist' or 'anylist'.

    o   Kmark
	  Weighted K-function. 
	  Identical to 'markcorrint' and will eventually replace it.

    o   marks.tess, marks<-.tess, unmark.tess:
	  Extract or change the marks associated with the tiles of a tessellation.

    o   quantess
	  Quantile tessellation: divide space into pieces which contain
	  equal amounts of 'stuff'.

    o   nestsplit
	  Nested split

    o   integral
	  New generic function for integrating functions,
	  with methods for 'im', 'msr', 'linim' and 'linfun'.

    o   selfcut.psp
	  Cut line segments where they cross each other

    o   as.function.im
	  Convert a pixel image to a function(x,y).

    o   as.linnet.linim
	  Extract the linear network from a 'linim' object.

    o   pool.fv, pool.anylist
	  New methods for 'pool' 

    o   Window.linnet
	  Extract the two-dimensional window containing a linear network.

SIGNIFICANT USER-VISIBLE CHANGES

    o   linnet, lpp
	  A linear network can now be built in 'sparse matrix' form
	  which requires much less memory. 

    o   chicago
	  The Chicago street crimes data are now stored in 'sparse matrix' form.
	  To convert them to non-sparse form, use as.lpp(chicago, sparse=FALSE)

    o   kppm
	  The parametrisation of cluster models has been reorganised.
	  The scale parameter is now always called 'scale'.
	  Results should be backward-compatible.

    o   cauchy.estK, cauchy.estpcf, matclust.estK, matclust.estpcf, 
	  thomas.estK, thomas.estpcf, vargamma.estK, vargamma.estpcf
	   The parametrisation of cluster models has been reorganised.
	   The scale parameter is now always called 'scale'.

    o   plot.kppm 
	  Also plots the cluster kernel.

    o   density.ppp
	  New argument 'se' allows calculation of standard errors as well.

    o   plot.pp3
	  Now produces a genuine perspective view.
	  New arguments control the eye position for the perspective view.

    o   Emark, Vmark
	  These functions can now work with multiple columns of marks.

    o   pixellate.psp
	  Can now count the number of segments that intersect each pixel, 
	  instead of the total length of intersection.

    o   linfun
	  If  g = linfun(f, L),
	  the function f will always be called as f(x,y,seg,tp, ...)
	  It is no longer expected to handle the case where 'seg' and 'tp' are absent.
	  The resulting function g can now be called as g(X) where X is an lpp object,
	  or as g(x,y) or g(x,y,seg,tp) where x,y,seg,tp are coordinates.

    o   tess
	  New argument 'marks' allows marks to be associated with tiles.

    o   anova.lppm
	  Outdated argument 'override' has been removed.

    o   split<-.ppp
	  Preserves the original ordering of the data, if possible.

    o   MultiHard, MultiStrauss, MultiStraussHard, HierStrauss
	  Zero values in the interaction radii are now treated as NA.
	  Improved handling of missing arguments.
	  Printed output now respects options('width')

    o   linearKinhom, linearKcross.inhom, linearKdot.inhom,
	    linearpcfinhom, linearpcfcross.inhom, linearpcfdot.inhom
	  If the intensity argument lambda, lambdaI, lambdaJ, lambdadot
	  is a fitted point process model, the model is first updated
	  by re-fitting it to the data, before computing the fitted intensity.

    o   solutionset
	  The expression will be evaluated using pixel arithmetic (Math.im)
	  if it cannot be evaluated using eval.im.

    o   to.grey
	  Now uses better weights for the R, G, B channels.

    o   rVarGamma
	  Accelerated.

    o   summary.mppm, print.mppm
	  These functions now respect options('width') and spatstat.options('terse').

    o   print.quadrattest
	  Now respects options('width') and spatstat.options('terse').

    o   print.pp3
	  Now respects options('width')

    o   print.lpp
	  Now respects options('width') and options('digits').

    o   print.owin, print.im, print.summary.owin, print.summary.im
	  Now respect options('width').

    o   nnmean
	  Now yields a vector, instead of a 1-column matrix,
	  when there is only a single column of marks.

    o   pairdist.psp, crossdist.psp, nndist.psp
	  The option 'method="Fortran"' is no longer supported.
	  The default is 'method="C"'.

    o   [.hyperframe:
	  When a row of data is extracted with drop=TRUE, the result
	  belongs to class 'anylist'.

    o   installation of spatstat
	  A Fortran compiler is no longer needed to compile spatstat from source.

    o   hyperframe class
	  The internal structure of hyperframes has changed slightly:
	  columns of objects are now stored and returned as
	  lists of class 'anylist' or 'solist'.
	  There should be no change in behaviour.

    o   datasets
	  Internal format of the datasets 
	  	    bdspots, bei, clmfires, demohyper, flu, gorillas, heather, 
	   Kovesi, murchison, osteo, pyramidal, waterstriders
	  has changed slightly to use the classes 'anylist' and 'solist'.
	  There should be no change in behaviour.

    o   K3est
	  New argument 'ratio'.

    o   spatstat.options
	  New option 'par.points3d' sets default arguments for plot.pp3. 

    o   diagnose.ppm
	  New arguments 'xlab', 'ylab', 'rlab' determine the labels
	  in the 4-panel plot, and new argument 'outer' controls their position.
	  The confusing default value for 'compute.sd' has been changed.

    o   iplot.layered
	  New argument 'visible' controls which layers are initially visible.

    o   plot.lpp
	  New argument 'show.window' controls whether to plot the containing window.

    o   textstring
	  Any number of spatial locations (x,y) can be specified,
	  with a corresponding vector of text strings.

    o   plot.hyperframe
	  New argument 'mar' 

    o   plot.linnet
	  New argument 'do.plot'

    o   summary.hyperframe
	  Improved output.

    o   eval.linim
	  Improved scoping rules.

    o   pixellate.owin
	  Accelerated.

    o   summary.linnet
	  Now prints more information, and respects options('digits').

    o   rmpoispp, rmpoint
	  The vector of possible types of points will default to the 'names' vector
	  of the argument 'lambda', 'n', or 'f' where appropriate.

    o   rpoislpp
	  Argument 'L' can be omitted when lambda is a 'linim' or 'linfun'

    o   simulate.ppm, simulate.kppm, simulate.lppm, simulate.slrm
	  New argument 'drop': if nsim = 1 and drop=TRUE, the result is a point pattern
	  rather than a list containing one point pattern.

    o   runifdisc, runifpoint, rpoint, rpoispp, rmpoint, rmpoispp, 
	  rMaternI, rMaternII, rSSI, rPoissonCluster, rGaussPoisson,
	  rstrat, rsyst, rcell, rthin, rNeymanScott, rMatClust, rThomas,
	  rCauchy, rVarGamma, rpoispp3, runifpoint3
	  New argument 'drop': if nsim = 1 and drop=TRUE, the result is a point pattern
	  rather than a list containing one point pattern.

    o   spatstat.options
	  New option 'units.paren' controls the type of parenthesis
	  enclosing the explanatory text about the unit of length,
	  in print.ppm, plot.fv, etc.

    o   closepairs, crosspairs
	  New option: what="ijd" returns only the indices i, j and the distance d

    o   rCauchy, rMatClust, rNeymanScott, rPoissonCluster, rThomas, rVarGamma
	  Argument names have changed.

BUG FIXES

    o   sumouter
	  A segmentation fault could occur if any data were NA.
	  Fixed.

    o   simulate.kppm
	  Simulation failed for log-Gaussian Cox processes (in simulate.kppm only) 
	  with an error message from the RandomFields package.
	  Fixed.

    o   ppm,  predict.ppm, profilepl
	  Crashed sometimes with message 
	  "interaction evaluator did not return a matrix".
	  Fixed.

    o   lppm
	  step() did not work correctly on 'lppm' objects.
	  Fixed.

    o   quadscheme
	  If quadscheme() was called explicitly, with the stipulated number of tiles
	  exceeding the number of dummy points given, then the quadrature weights 
	  were sometimes vastly inflated - total quadrature weight was
	  much larger than window area. Spotted by Ian Renner. 
	  Fixed.   

    o   predict.rhohat
	  Result was incorrect for data on a non-rectangular window 
	  (and a warning was issued about incorrect vector length).
	  Fixed.

    o   Math.im
	  Unary operators did not work (e.g."-x")
	  Fixed.

    o   density.ppp
	  Crashed when at="points" if the dataset had exactly 1 point.
	  Fixed.

    o   rSSI
	  Crashed if nsim > 1.
	  Fixed.

    o   influence.ppm, leverage.ppm, dfbetas.ppm
	  Crashed or issued a warning if any quadrature points had 
	  conditional intensity zero under the model (negative infinite values
	  of the sufficient statistic).
	  Fixed.

    o   clickppp, clickpoly
	  Did not work correctly in the RStudio display device.
	  Fixed.

    o   Iest
	  Ignored the arguments 'r' and 'eps'.
	  Fixed.

    o   markvario
	  Result was garbled, when X had more than one column of marks.
	  Fixed.

    o   rMatClust, rVarGamma, rCauchy, rNeymanScott
	  Result was a list, but not a 'solist', when nsim > 1.
	  Fixed.

    o   print.mppm, summary.mppm, subfits
	  Crashed if a Poisson interaction was implied but not given explicitly.
	  Fixed.

    o   Kest
	  Crashed if ratio=TRUE and the window was a rectangle.
	  Fixed.

    o   anova.ppm
	  Crashed sometimes with message 'models were not all fitted
	  to the same size of dataset'. 
	  (This occurred if there were quadrature points with
	  conditional intensity equal to zero in some models but not in all models.)
	  Fixed.

    o   vcov.kppm
	  Occasionally ran out of memory.
	  Fixed.

    o   as.linim.linfun
	  Erroneously converted the pixel values to numeric values.
	  Fixed.

    o   as.owin.layered
	  Ignored layers with zero area.
	  Fixed.

    o   plot.ppm
	  Paused the plot between frames even when there was only one frame.
	  Fixed.

    o   plot.layered
	  Did not allocate space for legends of 'lpp' objects.
	  Fixed.

    o   plot.lpp
	  Ignored symbolmap arguments like 'cex'
	  and confused the arguments 'col' and 'cols'.
	  Fixed.

    o   plot.diagppm
	  Ignored add=TRUE in some cases.
	  Fixed.

    o   iplot.layered
	  Did not handle 'diagramobj' objects correctly.
	  Fixed.

    o   plot.yardstick
	  Changed arguments.

                       Changes in version 1.41-0                        

OVERVIEW

    o   We thank Ahmed El-Gabbas, Ute Hahn, Aruna Jammalamadaka,
	  Ian Renner, Brian Ripley, Torben Tvedebrink and Sasha Voss 
	  for contributions.

    o   Fixed a bug causing a segmentation fault.

    o   Standard errors for kernel estimates of intensity.

    o   Test for segregation.

    o   Tessellations may now have marks.

    o   Nested splitting.

    o   More support for cluster models. Reorganised parametrisation.

    o   Sparse data representation of linear networks.

    o   More support for data on a linear network.

    o   New datasets: 'spiders' and 'dendrite'.

    o   Improvements and bug fixes.

    o   spatstat no longer uses Fortran.

    o   spatstat no longer depends on the package 'scatterplot3d'.

    o   spatstat now imports (rather than 'suggests') the Matrix package.

    o   Nickname: 'Team Australia'

NEW DATASETS

    o   dendrite
	  Dendritic spines on the dendrite network of a neuron.
	  A point pattern on a linear network.
	  Generously contributed by Aruna Jammalamadaka.

    o   spiders
	  Spider webs on the mortar lines of a brick wall.
	  A point pattern on a linear network.
	  Generously contributed by Sasha Voss.

NEW FUNCTIONS

    o   segregation.test
	  Test of spatial segregation of types in a multitype point pattern.

    o   clusterfield, clusterkernel
	  Compute the cluster kernel (offspring density) of a cluster process model,
	  or compute the cluster field generated by superimposing copies 
	  of the cluster kernel at specified locations.

    o   clusterradius
	  Compute the radius of the support of the offspring density
	  of a cluster process model. 

    o   as.linnet.psp
	  Convert a line segment pattern to a linear network
	  by guessing the connectivity using a distance threshold.

    o   iplot.linnet, iplot.lpp
	  Methods for interactive plotting 'iplot' for objects of class lpp and linnet.

    o   Mathematical operations are now supported for pixel images
	  on a linear network. See help(Math.linim)

    o   dirichlet.network, delaunay.network
	  The linear networks formed by the Dirichlet tessellation 
	  and Delaunay triangulation.

    o   dirichlet.edges
	  The edges of the Dirichlet tessellation.

    o   selfcut.psp
	  Cut line segments where they cross each other.

    o   vertices.linnet
	  Extract the vertices (nodes) of the linear network.

    o   vertexdegree
	  Compute the degree of each vertex in a linear network.

    o   pixellate.linnet
	  Pixellate a linear network.

    o   subset.hyperframe
	  'subset' method for class 'hyperframe'.

    o   head.hyperframe, tail.hyperframe
	  'head' and 'tail' methods for hyperframes.

    o   clickdist
	  Measures the distance between two spatial locations clicked by the user.

    o   solapply, anylapply
	  wrappers for 'lapply' which return a list of class 'solist' or 'anylist'.

    o   Kmark
	  Weighted K-function. 
	  Identical to 'markcorrint' and will eventually replace it.

    o   marks.tess, marks<-.tess, unmark.tess:
	  Extract or change the marks associated with the tiles of a tessellation.

    o   quantess
	  Quantile tessellation: divide space into pieces which contain
	  equal amounts of 'stuff'.

    o   nestsplit
	  Nested split

    o   integral
	  New generic function for integrating functions,
	  with methods for 'im', 'msr', 'linim' and 'linfun'.

    o   selfcut.psp
	  Cut line segments where they cross each other

    o   as.function.im
	  Convert a pixel image to a function(x,y).

    o   as.linnet.linim
	  Extract the linear network from a 'linim' object.

    o   pool.fv, pool.anylist
	  New methods for 'pool' 

    o   Window.linnet
	  Extract the two-dimensional window containing a linear network.

SIGNIFICANT USER-VISIBLE CHANGES

    o   linnet, lpp
	  A linear network can now be built in 'sparse matrix' form
	  which requires much less memory. 

    o   chicago
	  The Chicago street crimes data are now stored in 'sparse matrix' form.
	  To convert them to non-sparse form, use as.lpp(chicago, sparse=FALSE)

    o   kppm
	  The parametrisation of cluster models has been reorganised.
	  The scale parameter is now always called 'scale'.
	  Results should be backward-compatible.

    o   cauchy.estK, cauchy.estpcf, matclust.estK, matclust.estpcf, 
	  thomas.estK, thomas.estpcf, vargamma.estK, vargamma.estpcf
	   The parametrisation of cluster models has been reorganised.
	   The scale parameter is now always called 'scale'.

    o   plot.kppm 
	  Also plots the cluster kernel.

    o   density.ppp
	  New argument 'se' allows calculation of standard errors as well.

    o   plot.pp3
	  Now produces a genuine perspective view.
	  New arguments control the eye position for the perspective view.

    o   Emark, Vmark
	  These functions can now work with multiple columns of marks.

    o   pixellate.psp
	  Can now count the number of segments that intersect each pixel, 
	  instead of the total length of intersection.

    o   linfun
	  If  g = linfun(f, L),
	  the function f will always be called as f(x,y,seg,tp, ...)
	  It is no longer expected to handle the case where 'seg' and 'tp' are absent.
	  The resulting function g can now be called as g(X) where X is an lpp object,
	  or as g(x,y) or g(x,y,seg,tp) where x,y,seg,tp are coordinates.

    o   tess
	  New argument 'marks' allows marks to be associated with tiles.

    o   anova.lppm
	  Outdated argument 'override' has been removed.

    o   split<-.ppp
	  Preserves the original ordering of the data, if possible.

    o   MultiHard, MultiStrauss, MultiStraussHard, HierStrauss
	  Zero values in the interaction radii are now treated as NA.
	  Improved handling of missing arguments.
	  Printed output now respects options('width')

    o   linearKinhom, linearKcross.inhom, linearKdot.inhom,
	    linearpcfinhom, linearpcfcross.inhom, linearpcfdot.inhom
	  If the intensity argument lambda, lambdaI, lambdaJ, lambdadot
	  is a fitted point process model, the model is first updated
	  by re-fitting it to the data, before computing the fitted intensity.

    o   solutionset
	  The expression will be evaluated using pixel arithmetic (Math.im)
	  if it cannot be evaluated using eval.im.

    o   to.grey
	  Now uses better weights for the R, G, B channels.

    o   rVarGamma
	  Accelerated.

    o   summary.mppm, print.mppm
	  These functions now respect options('width') and spatstat.options('terse').

    o   print.quadrattest
	  Now respects options('width') and spatstat.options('terse').

    o   print.pp3
	  Now respects options('width')

    o   print.lpp
	  Now respects options('width') and options('digits').

    o   print.owin, print.im, print.summary.owin, print.summary.im
	  Now respect options('width').

    o   nnmean
	  Now yields a vector, instead of a 1-column matrix,
	  when there is only a single column of marks.

    o   pairdist.psp, crossdist.psp, nndist.psp
	  The option 'method="Fortran"' is no longer supported.
	  The default is 'method="C"'.

    o   [.hyperframe:
	  When a row of data is extracted with drop=TRUE, the result
	  belongs to class 'anylist'.

    o   installation of spatstat
	  A Fortran compiler is no longer needed to compile spatstat from source.

    o   hyperframe class
	  The internal structure of hyperframes has changed slightly:
	  columns of objects are now stored and returned as
	  lists of class 'anylist' or 'solist'.
	  There should be no change in behaviour.

    o   datasets
	  Internal format of the datasets 
	  	    bdspots, bei, clmfires, demohyper, flu, gorillas, heather, 
	   Kovesi, murchison, osteo, pyramidal, waterstriders
	  has changed slightly to use the classes 'anylist' and 'solist'.
	  There should be no change in behaviour.

    o   K3est
	  New argument 'ratio'.

    o   spatstat.options
	  New option 'par.points3d' sets default arguments for plot.pp3. 

    o   diagnose.ppm
	  New arguments 'xlab', 'ylab', 'rlab' determine the labels
	  in the 4-panel plot, and new argument 'outer' controls their position.
	  The confusing default value for 'compute.sd' has been changed.

    o   iplot.layered
	  New argument 'visible' controls which layers are initially visible.

    o   plot.lpp
	  New argument 'show.window' controls whether to plot the containing window.

    o   textstring
	  Any number of spatial locations (x,y) can be specified,
	  with a corresponding vector of text strings.

    o   plot.hyperframe
	  New argument 'mar' 

    o   plot.linnet
	  New argument 'do.plot'

    o   summary.hyperframe
	  Improved output.

    o   eval.linim
	  Improved scoping rules.

    o   pixellate.owin
	  Accelerated.

    o   summary.linnet
	  Now prints more information, and respects options('digits').

    o   rmpoispp, rmpoint
	  The vector of possible types of points will default to the 'names' vector
	  of the argument 'lambda', 'n', or 'f' where appropriate.

    o   rpoislpp
	  Argument 'L' can be omitted when lambda is a 'linim' or 'linfun'

    o   simulate.ppm, simulate.kppm, simulate.lppm, simulate.slrm
	  New argument 'drop': if nsim = 1 and drop=TRUE, the result is a point pattern
	  rather than a list containing one point pattern.

    o   runifdisc, runifpoint, rpoint, rpoispp, rmpoint, rmpoispp, 
	  rMaternI, rMaternII, rSSI, rPoissonCluster, rGaussPoisson,
	  rstrat, rsyst, rcell, rthin, rNeymanScott, rMatClust, rThomas,
	  rCauchy, rVarGamma
	  New argument 'drop'

    o   spatstat.options
	  New option 'units.paren' controls the type of parenthesis
	  enclosing the explanatory text about the unit of length,
	  in print.ppm, plot.fv, etc.

    o   closepairs, crosspairs
	  New option: what="ijd" returns only the indices i, j and the distance d

    o   rCauchy, rMatClust, rNeymanScott, rPoissonCluster, rThomas, rVarGamma
	  Argument names have changed.

BUG FIXES

    o   sumouter
	  A segmentation fault could occur if any data were NA.
	  Fixed.

    o   simulate.kppm
	  Simulation failed for log-Gaussian Cox processes (in simulate.kppm only) 
	  with an error message from the RandomFields package.
	  Fixed.

    o   ppm,  predict.ppm, profilepl
	  Crashed sometimes with message 
	  "interaction evaluator did not return a matrix".
	  Fixed.

    o   lppm
	  step() did not work correctly on 'lppm' objects.
	  Fixed.

    o   quadscheme
	  If quadscheme() was called explicitly, with the stipulated number of tiles
	  exceeding the number of dummy points given, then the quadrature weights 
	  were sometimes vastly inflated - total quadrature weight was
	  much larger than window area. Spotted by Ian Renner. 
	  Fixed.   

    o   predict.rhohat
	  Result was incorrect for data on a non-rectangular window 
	  (and a warning was issued about incorrect vector length).
	  Fixed.

    o   Math.im
	  Unary operators did not work (e.g."-x")
	  Fixed.

    o   density.ppp
	  Crashed when at="points" if the dataset had exactly 1 point.
	  Fixed.

    o   rSSI
	  Crashed if nsim > 1.
	  Fixed.

    o   influence.ppm, leverage.ppm, dfbetas.ppm
	  Crashed or issued a warning if any quadrature points had 
	  conditional intensity zero under the model (negative infinite values
	  of the sufficient statistic).
	  Fixed.

    o   clickppp, clickpoly
	  Did not work correctly in the RStudio display device.
	  Fixed.

    o   Iest
	  Ignored the arguments 'r' and 'eps'.
	  Fixed.

    o   markvario
	  Result was garbled, when X had more than one column of marks.
	  Fixed.

    o   rMatClust, rVarGamma, rCauchy, rNeymanScott
	  Result was a list, but not a 'solist', when nsim > 1.
	  Fixed.

    o   print.mppm, summary.mppm, subfits
	  Crashed if a Poisson interaction was implied but not given explicitly.
	  Fixed.

    o   Kest
	  Crashed if ratio=TRUE and the window was a rectangle.
	  Fixed.

    o   anova.ppm
	  Crashed sometimes with message 'models were not all fitted
	  to the same size of dataset'. 
	  (This occurred if there were quadrature points with
	  conditional intensity equal to zero in some models but not in all models.)
	  Fixed.

    o   vcov.kppm
	  Occasionally ran out of memory.
	  Fixed.

    o   as.linim.linfun
	  Erroneously converted the pixel values to numeric values.
	  Fixed.

    o   as.owin.layered
	  Ignored layers with zero area.
	  Fixed.

    o   plot.ppm
	  Paused the plot between frames even when there was only one frame.
	  Fixed.

    o   plot.layered
	  Did not allocate space for legends of 'lpp' objects.
	  Fixed.

    o   plot.lpp
	  Ignored symbolmap arguments like 'cex'
	  and confused the arguments 'col' and 'cols'.
	  Fixed.

    o   plot.diagppm
	  Ignored add=TRUE in some cases.
	  Fixed.

    o   iplot.layered
	  Did not handle 'diagramobj' objects correctly.
	  Fixed.

    o   plot.yardstick
	  Changed arguments.

                 Changes in version 1.40-0 (2014-12-31)                 

OVERVIEW

    o   We thank Markus Herrmann, Peter Kovesi, Andrew Lister, 
	  Enrique Miranda, Tuomas Rajala, Brian Ripley, Dominic Schuhmacher 
	  and Maxime Woringer for contributions.

    o   Important bug fixes.

    o   Mathematical operators now apply to images.

    o   Parametric estimates of relative risk from fitted point process models.

    o   Standard errors for relative risk (parametric and non-parametric).

    o   Kernel smoothing and rose diagrams for angular data.

    o   Perceptually uniform colour maps. 

    o   Hierarchical interactions for multitype patterns.

    o   Hard core parameters in all interactions no longer need to be specified
	    and will be estimated from data.

    o   Improvements to analysis of deviance and model selection.

    o   New datasets.

    o   New vignette, summarising all datasets installed with spatstat.

    o   Tests and diagnostics now include a Monte Carlo option.

    o   Faster checking of large datasets.

    o   Faster simulations.

    o   Code for drawing diagrams (arrows, scale bars).

    o   Version nickname: 'Do The Maths'

NEW DATASETS

    o   bdspots
	  Breakdown spots on microelectronic capacitor electrodes.
	  Generously contributed by Prof Enrique Miranda.

    o   Kovesi
	  Colour maps with perceptually uniform contrast.
	  Generously contributed by Peter Kovesi.

NEW FUNCTIONS

    o   Mathematical operations are now supported for images.
	  For example:   alpha <- atan(bei.extra$grad) * 180/pi
	  See help(Math.im)

    o   relrisk.ppm
	  Spatially-varying probabilities of different types of points
	  predicted by a fitted point process model.

    o   circdensity
	  Kernel density estimate for angular data

    o   rose
	  Rose diagram (rose of directions) for angular data

    o   nnorient
	  Nearest neighbour orientation distribution.

    o   AIC.ppm
	  Calculate AIC of a Gibbs model using Takeuchi's rule.

    o   interp.colours
	  Interpolate a sequence of colour values.

    o   anyDuplicated.ppp, anyDuplicated.ppx
	  Fast replacements for any(duplicated(x)) for point patterns.

    o   textstring, onearrow, yardstick
	  Objects representing a text string, an arrow, or a scale bar,
	  for use in drawing spatial diagrams.

    o   plot.imlist, image.imlist, contour.imlist
	  Methods for the new class 'imlist'

    o   [<-.layered,  [[<-.layered
	  More support for class 'layered'

SIGNIFICANT USER-VISIBLE CHANGES

    o   (vignettes)
	  New vignette 'datasets' summarises all the datasets installed
	  with the spatstat package.

    o   relrisk
	  The function relrisk is now generic, with methods for ppp and ppm.
	  New argument 'relative' specifies whether to calculate the relative risk
	  or the absolute probability of each type of point.
	  New argument 'se' specifies whether to calculate standard errors.

    o   plot.im
	  The default colour map for plotting images,
	  specified by spatstat.options('image.colfun'), 
	  has been changed to a perceptually uniform map.

    o   DiggleGratton, Fiksel, MultiHard, MultiStraussHard
	  The hard core distance parameters in these models
	  can now be omitted by the user, and will be estimated automatically
	  from data (by the 'self-starting' feature of interactions).
	  This was already true of Hardcore and StraussHard.

    o   Hybrid
	  Hybrid models now apply the 'self-starting' feature
	  to each component model. 

    o   anova.ppm
	  Can now reconcile models fitted using different dummy points,
	  different values of 'rbord', different values of 'use.gam', etc. 

    o   profilepl
	  New argument 'aic' makes it possible to optimise the parameters 
	  by minimising AIC.

    o   profilepl
	  No longer requires values for parameters which are 'optional' 
	  (such as the hard core distance).

    o   rmh, simulate.ppm, rmh.ppm, rmh.default
	  The Metropolis-Hastings algorithm now starts by deleting any points
	  in the initial state that are 'illegal' (i.e. whose conditional intensity
	  is equal to zero). This ensures that the result of rmh 
	  never contains illegal points.

    o   runifpoint, rpoispp, rStrauss, rHardcore, rStraussHard,
	  rDiggleGratton, rDGS, runifdisc, rpoint, rMaternI, rMaternII, rSSI,
	  rPoissonCluster, rGaussPoisson, rstrat, rsyst, rcell, rthin, rjitter,
	  rNeymanScott, rMatClust, rThomas, rCauchy, rVarGamma, rmpoint, rmpoispp, 
	  runifpointOnLines, rpoisppOnLines, runiflpp, rpoislpp, runifpointx, 
	  rpoisppx, runifpoint3, rpoispp3
	     These random point pattern generators now have an argument 'nsim'
	     specifying the number of simulated realisations to be generated.

    o   pairorient
	  New argument 'cumulative'.
	  New algorithm to compute kernel estimate of probability density.
	  Default behaviour changed.
	  Argument 'units' has been renamed 'unit' for consistency.
	  Labels and descriptions of columns have been corrected.

    o   predict.ppm
	  New syntax (backward-compatible).
	  New argument 'se' replaces option 'type="se"'.
	  Old argument 'total' is deprecated: use 'window' and set 'type="count"'.

    o   cdf.test
	  The methods for class 'ppm' and 'lppm' now handle Gibbs models
	  and perform a Monte Carlo test in this case.

    o   lurking, diagnose.ppm
	  Lurking variable plot can now include simulation envelopes.

    o   rmh.ppm
	  New argument 'w' determines the window in which the simulated pattern
	  is generated.

    o   ppp
	  Accelerated.

    o   Gcom, Gres
	  When conditional=TRUE and restrict=TRUE, the Hanisch estimate
	  was not calculated exactly as described in Appendix E.1 of 
	  Baddeley, Rubak and Moller (2011). The intensity was estimated 
	  on the full window rather than the eroded window.
	  Fixed.   

    o   step, drop1, add1, extractAIC
	  The AIC of a Gibbs model is now calculated using Takeuchi's rule
	  for the degrees of freedom.

    o   model.matrix.ppm, model.matrix.kppm
	  New argument 'Q' allows prediction at any desired locations.

    o   vcov.ppm
	  New argument 'fine' gives more control over computation.

    o   predict.ppm
	  For multitype models, when the result is a list of images,
	  the names of list entries are now identical to the mark levels
	  (e.g. "hickory" instead of "markhickory")

    o   print.slrm
	  Output now respects options('width')

    o   image.listof
	  New argument 'ribmar' controls margin space around the ribbon
	  when equal.ribbon=TRUE.

    o   integral.im
	  New argument 'domain' specifies the domain of integration.

    o   plot.fasp
	  New argument 'transpose' allows rows and columns to be exchanged.

    o   plot.im
	  The list 'ribargs' can now include the parameter 'labels'.

    o   rmh, rpoint, rpoispp, rmpoint, rmpoispp
	  Accelerated, for inhomogeneous processes.

    o   stienen
	  Now recognises the parameter 'lwd'. 

    o   suffstat
	  Accelerated (also affects ppm with method='ho').

    o   Poisson, AreaInter, BadGey, Concom, DiggleGatesStibbard, DiggleGratton,
	  Fiksel, Geyer, Hardcore, Hybrid, LennardJones, MultiHard, MultiStrauss,
	  MultiStraussHard, OrdThresh, Ord, PairPiece, Pairwise, SatPiece, 
	  Saturated, Softcore, Strauss, StraussHard, Triplets
	     These functions can now be printed (by typing the function name)
	     to give a sensible description of the required syntax.

    o   fitin
	  A plot of the fitted interpoint interaction of a point process model
	  e.g. plot(fitin(ppm(swedishpines ~ 1, Strauss(9))))
	  now shows the unit of length on the x-axis.

    o   fitin
	  Plots of the fitted interpoint interaction are now possible
	  for some higher-order interactions such as Geyer and AreaInter.

    o   anova.ppm
	  New argument 'warn' to suppress warnings.

    o   rmhmodel.ppm
	  Argument 'win' renamed 'w' for consistency with other functions.

    o   print.ppm
	  Printed output for the fitted regular parameters
	  now respects options('digits').

    o   print.ppm, print.summary.ppm
	  Output now respects options('width') and spatstat.options('terse')

    o   print.ppm
	  By default, standard errors are not printed 
	  for a model fitted with method="logi" (due to computational load)

    o   plot.profilepl
	  Now recognises 'lty', 'lwd', 'col' etc

    o   vesicles, gorillas
	  Some of the raw data files for these datasets are also installed in spatstat
	  for demonstration and training purposes. 

BUG FIXES

    o   rmh, rmh.ppm, rmh.default, simulate.ppm
	  The result of simulating a model with a hard core
	  did not necessarily respect the hard core constraint,
	  and simulation of a model with strong inhibition
	  did not necessarily converge. 
	  This only happened if the first order trend was large,
	  the starting state (n.start or x.start) was not given,
	  and the number of iterations (nrep) was not very large.
	  It occurred because of a poor choice for the default starting state.
	  Bug was present since about 2010.
	  Fixed.

    o   markcorrint
	  Results were completely incorrect.
	  Bug introduced in spatstat 1.39-0, october 2014.
	  Fixed.

    o   Kinhom
	  Ignored argument 'reciplambda2' in some cases.
	  Bug introduced in spatstat 1.39-0, october 2014.
	  Fixed.

    o   relrisk
	  When at="pixels", a small fraction of pixel values were sometimes
	  wildly inaccurate, due to numerical errors. This affected the 
	  range of values in the result, and therefore the appearance of plots.
	  Fixed.

    o   model.images
	  Crashed if the model was multitype.
	  Fixed.

    o   profilepl
	  Crashed in some cases when the interaction was multitype.
	  [Spotted by Andrew Lister.]
	  Fixed.

    o   profilepl
	  Crashed if the model involved covariates that were not
	  given in a 'data' argument.
	  Fixed.

    o   envelope.ppm
	  Crashed if global=TRUE and savefuns=TRUE.
	  Fixed.

    o   setminus.owin
	  Crashed if the result was empty and the input was polygonal.
	  Fixed.

    o   predict.ppm
	  Crashed sometimes when type="cif" and ngrid was very large.
	  Fixed.

    o   pixelquad
	  If X was a multitype point pattern, the result was mangled.
	  Fixed.

    o   relrisk
	  Did not accept a character string value for the argument 'case'.
	  Fixed.

    o   intensity.ppm
	  Format of result was incorrect for ppm(Y ~ 1) where Y is multitype.
	  Fixed.

    o   $<-.hyperframe
	  Columns containing character values were converted to factors.
	  Fixed.

    o   clickppp
	  Sometimes filled the window in solid black colour..
	  Fixed.

    o   plot.psp
	  Ignored 'show.all' in some cases.
	  Fixed.

    o   plot.ppp
	  Warned about NA values amongst the marks, even if there were no NA's
	  in the column(s) of marks selected by the argument 'which.marks'.
	  Fixed.

    o   stienen
	  Did not suppress the border circles when border=FALSE.
	  Fixed.

                 Changes in version 1.39-1 (2014-10-24)                 

OVERVIEW

    o   Urgent bug fix.

    o   We thank Suman Rakshit and Brian Ripley for contributions.

BUG FIXES

    o   bdry.mask, convexhull
	  In R-devel only, these functions could return an empty window,
	  causing errors in other packages.
	  [Spotted by Brian Ripley.]
	  Fixed.

    o   project2segment
	  An error occurred if any line segments had length zero.
	  [Spotted by Suman Rakshit.]
	  Fixed.

                 Changes in version 1.39-0 (2014-10-23)                 

OVERVIEW

    o   We thank Shane Frank, Shaaban Ghalandarayeshi, Ute Hahn, 
	    Mahdieh Khanmohammadi, Nicoletta Nava, Jens Randel Nyengaard,
	    Sebastian Schutte, Rasmus Waagepetersen and Carl G. Witthoft 
	    for contributions.

    o   ANOVA extended to Gibbs models.

    o   Improved algorithm for locally-scaled K-function.

    o   Leave-one-out calculation of fitted values in ppm objects.

    o   New dataset: presynaptic vesicles.

    o   Geometrical operations with windows and images.

    o   More edge corrections for K-function.

    o   Improved handling and plotting of 'fv' objects.

    o   Utilities for perspective views of surfaces.

    o   New classes 'anylist', 'solist' will ultimately replace 'listof'.

    o   Bug fixes.

    o   Version nickname: 'Smoke and Mirrors'

NEW DATASETS

    o   vesicles
	  Synaptic vesicles 
	  (includes raw data files for training purposes)

NEW CLASSES

    o   anylist
	  List of objects. 
	  (A replacement for 'listof')

    o   solist
	  List of two-dimensional spatial objects.
	  (A replacement for some uses of 'listof')

NEW FUNCTIONS

    o   perspPoints, perspLines, perspSegments, perspContour
	  Draw points and lines on a surface, as seen in perspective view.

    o   hopskel.test
	  Hopkins-Skellam test of CSR

    o   project2set
	  For each data point in a point pattern X, find the nearest
	  spatial location in a given window W.

    o   stienen, stienenset
	  Stienen diagrams

    o   dirichlet.vertices
	  Vertices of the Dirichlet tessellation

    o   discs 
	  Union of discs.
	  Given a point pattern dataset recording the locations and diameters
	  of objects, find the region covered by the objects.

    o   increment.fv
	  Increments of a summary function: g(x) = f(x+h)-f(x-h).

    o   rotmean
	  Rotational average of pixel values in an image

    o   fardist
	  Distance from each pixel/data point to farthest part of window boundary

    o   circumradius.owin
	  Circumradius of a window

    o   rmax.Trans, rmax.Ripley
	  Compute the maximum distance 'r' for which the 
	  translation edge correction and isotropic edge correction   
	  are valid.

    o   is.grey
	  Determines whether a colour value is a shade of grey.

    o   harmonise
	  Convert several objects of the same class to a common format.
	  (New generic function with existing methods harmonise.im and harmonise.fv)

    o   area
	  New generic function, with methods for 'owin' and 'default'.

    o   Fhazard
	  Hazard rate of empty space function

    o   anylist, as.anylist, [.anylist, [<-.anylist, print.anylist, summary.anylist
	  Support for new class 'anylist'

    o   solist, as.solist, [.solist, [<-.solist, print.solist, summary.solist
	  Support for new class 'solist'

    o   plot.anylist, plot.solist
	  Plot methods for the classes 'anylist' and 'solist'
	  (Currently identical to 'plot.listof')

SIGNIFICANT USER-VISIBLE CHANGES

    o   anova.ppm
	  Now applies to Gibbs models as well as Poisson models,
	  using adjusted composite likelihood ratio test statistic.

    o   persp.im
	  If visible=TRUE, the algorithm will also calculate which pixels of x
	  are visible in the perspective view. This is useful for drawing
	  points or lines on a perspective surface.

    o   Kscaled
	  Improved algorithm [thanks to Ute Hahn.]
	  New arguments 'renormalise' and 'normpower' allow renormalisation
	  of intensity, similar to Kinhom.

    o   Kest
	  New option: correction="rigid" computes the rigid motion correction.

    o   pairwise interactions 
	  Fitted parameters and other calculations for pairwise interaction models
	  DiggleGatesStibbard, DiggleGratton, Fiksel, Geyer, Strauss 
	  may change slightly due to a change in handling numerical rounding effects.

    o   eval.fv
	  Functions no longer need to have exactly the same sequence of 'r' values.
	  They will now be made compatible using 'harmonise.fv'.

    o   fitted.ppm
	  New argument 'leaveoneout' allows leave-one-out calculation
	  of fitted intensity at original data points.

    o   Kinhom, Linhom
	  New argument 'leaveoneout' specifies whether the leave-one-out rule
	  should be applied when calculating the fitted intensities. 

    o   crosspaircounts
	  Results may change slightly due to a change in handling numerical 
	  rounding effects.

    o   Fest, Gest
	  New argument 'domain' supports bootstrap methods.

    o   plot.fv
	  New argument 'mathfont' determines the font (e.g. plain, italic, bold)
	  for mathematical expressions on the axes and in the legend.
	  Defaults to italic.

    o   scanpp 
	  Upgraded to handle multiple columns of mark data.

    o   circumradius
	  The function 'circumradius' is now generic, with methods
	  for the classes 'owin' and 'linnet'.

    o   edge.Trans
	  New argument 'give.rmax' 

    o   fvnames, plot.fv
	  The symbol '.a' is now recognised. It stands for 'all function values'.

    o   as.function.fv
	  Argument 'extrapolate' can have length 1 or 2.

    o   varblock
	  New argument 'confidence' determines the confidence level.

    o   $<-.fv
	  This can now be used to add an extra column to an 'fv' object
	  (previously it refused).

    o   minnndist, maxnndist
	  New argument 'positive'. If TRUE, coincident points are ignored:
	  the nearest-neighbour distance of a point is the distance to the
	  nearest point that does not coincide with the current point.

    o   plot.fv
	  Improved handling of 'shade' argument.

    o   Kmeasure
	  Now passes '...' arguments to as.mask()

    o   Ksector
	  Now allows start < 0.  
	  New arguments 'units' and 'domain'.

    o   pairorient
	  New arguments 'units' and 'domain'.

    o   eroded.areas
	  New argument 'subset'

    o   disc
	  New argument 'delta' 

    o   plot.plotppm
	  New argument 'pppargs'

    o   harmonise.fv, harmonise.im
	  These are now methods for the new generic 'harmonise'

    o   Fest, Gest
	  These functions now also compute the theoretical value of hazard
	  for a Poisson process, if correction = "km".

    o   with.fv
	  Improved mathematical labels.

    o   Gfox, Jfox
	  Improved mathematical labels.

    o   area.owin
	  This function is now a method for the new generic 'area'

    o   edges
	  Default for argument 'check' changed to FALSE.

BUG FIXES

    o   varblock
	  Calculations were incorrect if more than one column of 
	  edge corrections was computed. 
	  [Bug introduced in spatstat 1.21-1, november 2010.]
	  Fixed.

    o   varblock
	  Crashed if one of the quadrats contained no data points.
	  Fixed.

    o   lohboot
	  Interval was calculated wrongly when global=TRUE and fun="Lest" or "Linhom".
	  Fixed.

    o   nnmark
	  Crashed when at="points" if there was only a single column of marks.
	  [Spotted by Shane Frank.]
	  Fixed.

    o   plot.msr
	  Some elements of the plot were omitted or cut off.
	  Fixed.

    o   plot.msr
	  Did not work with 'equal.scales=TRUE'.
	  Fixed.

    o   plot.msr, augment.msr
	  Crashed if every data point was duplicated.
	  Fixed.

    o   as.im.owin
	  Crashed if X was a 1 x 1 pixel array.
	  Fixed.

    o   owin
	  Coordinates of polygon data were altered slightly when fix=TRUE. 
	  [Spotted by Carl Witthoft.]
	  Fixed.

    o   objects of class 'fv'
	  Assigning a new value to names(x) or colnames(x) or dimnames(x)
	  would cause the internal data format to become corrupted.
	  Fixed.

    o   to.grey, complementarycolour
	  Did not work properly on 'colourmap' objects.
	  Fixed.

    o   Kest
	  Ignored argument 'var.approx' if the window was a rectangle.
	  Fixed.

    o   rmh.ppm, rmhmodel.ppm
	  Ignored the argument 'new.coef'.
	  [Spotted by Sebastian Schutte]
	  Fixed.

    o   as.function.fv
	  The meanings of 'extrapolate=TRUE' and 'extrapolate=FALSE' were swapped.
	  Fixed.

    o   varblock
	  Handled the case 'fun=Lest' incorrectly.
	  Fixed.

    o   [.fv
	  Sometimes garbled the internal data format, causing plot.fv to crash.
	  Fixed.

    o   range.fv
	  Sometimes returned NA even when na.rm=TRUE.
	  Fixed.

    o   Fest
	  Argument 'eps' was not interpreted correctly.
	  Fixed.

    o   plot.fv
	  Argument 'lwd' was not passed to legend()

    o   flipxy.owin
	  Sometimes deleted the name of the unit of length.
	  Fixed.

                 Changes in version 1.38-1 (2014-08-28)                 

OVERVIEW

    o   We thank Ute Hahn and Xavier Raynaud for contributions.

    o   Urgent Bug Fixes.

    o   Nickname: 'Le Hardi'

NEW FUNCTIONS

    o   "[<-.fv", "$<-.fv"
	  Subset replacement methods for 'fv' objects.

SIGNIFICANT USER-VISIBLE CHANGES

    o   clarkevans.test
	  Simulations are now performed with a fixed number of points.

    o   plot.owin, plot.ppp, plot.psp, plot.im
	  The default size of the outer margin of white space has been
	  reduced. 

    o   dclf.test
	  Improved information in printed output.

BUG FIXES

    o   update.ppm
	  Results were incorrect in several cases.
	  [Spotted by Xavier Raynaud.]
	  Bug introduced in spatstat 1.38-0.
	  Fixed.

    o   Kinhom, Linhom
	  Calculations were incorrect if 'lambda' was a fitted point process model.
	  [Spotted by Xavier Raynaud.]
	  Bug introduced in spatstat 1.38-0.
	  Fixed.

    o   envelope.envelope
	  Ignored the arguments 'global' and 'VARIANCE'.
	  Fixed.

    o   fv objects
	  If 'f' was an object of class 'fv', then an assignment like f$name <- NULL
	  mangled the internal format of the object 'f', leading to errors
	  in print.fv and plot.fv.
	  [Spotted by Ute Hahn.]
	  Fixed.

    o   split.ppp
	  split(X, A) where A is a rectangular tessellation,
	  produced errors if the window of 'A' did not include the window of 'X'.
	  [Spotted by Ute Hahn.]
	  Fixed.

    o   names<-.hyperframe
	  Mangled the internal format.
	  [Spotted by Ute Hahn.]
	  Fixed.

    o   plot.fv
	  y axis label was incorrect in some cases when the 'fv' object
	  had only a single column of function values.
	  [Spotted by Ute Hahn.]
	  Fixed.

                 Changes in version 1.38-0 (2014-08-15)                 

OVERVIEW

    o   We thank Malissa Baddeley, Colin Beale, Oscar Garcia, Daniel Esser, 
	    David Ford, Eric Gilleland, Andrew Hardegen, Philipp Hunziker, 
	    Abdollah Jalilian, Tom Lawrence, Lore De Middeleer, Robin Milne, 
	    Mike Porter, Suman Rakshit, Pablo Ramon, Jason Rudokas, 
	    Christopher Ryan, Dominic Schuhmacher, Medha Uppala 
	    and Rasmus Waagepetersen for contributions.

    o   spatstat now Requires the package 'goftest' 
	    and Suggests the package 'Matrix'.

    o   New dataset: 'sporophores'

    o   Palm likelihood method for fitting cluster processes and Cox processes.

    o   Quasi-likelihood and weighted composite likelihood methods
	    for estimating trend in cluster processes and Cox processes.

    o   Further extensions to model formulas in ppm and kppm.

    o   Faster variance calculations for ppm objects.

    o   One-sided tests and one-sided envelopes of summary functions.

    o   Cramer-Von Mises and Anderson-Darling tests of spatial distribution.

    o   Cressie-Read test statistic in quadrat counting tests.

    o   Spatial cumulative distribution functions.

    o   Faster algorithm for point pattern matching.

    o   Improvements to plots.

    o   Increased support for envelopes.

    o   New generic functions 'Window', 'Frame' and 'domain'.

    o   Directional K-function and directional distribution.

    o   Raster calculations accelerated.

    o   Summary functions accelerated.

    o   Many improvements and bug fixes.

    o   Version nickname: 'Wicked Plot'

NEW DATASETS

    o   sporophores
	  Spatial pattern of three species of mycorrhizal fungi around a tree.
	  [Contributed by E. David Ford.]

NEW FUNCTIONS

    o   improve.kppm
	  Re-estimate the trend in a kppm (cluster or Cox) model
	  using quasi-likelihood or weighted first-order composite likelihood.
	  [Contributed by Abdollah Jalilian and Rasmus Waagepetersen.]

    o   Window, Window<-
	  Generic functions to extract and change the window of a spatial object
	  in two dimensions. Methods for ppp, psp, im, and many others.

    o   Frame, Frame<-
	  Generic functions to extract and change the containing rectangle ('frame')
	  of a spatial object in two dimensions. 

    o   domain
	  Generic function to extract the spatial domain of a spatial object
	  in any number of dimensions. 

    o   Ksector
	  Directional version of the K-function.

    o   pairorient
	  Point pair orientation distribution.

    o   spatialcdf
	  Compute the spatial cumulative distribution of a spatial covariate,
	  optionally using spatially-varying weights.

    o   cdf.test 
	  [Supersedes 'kstest'.]
	  Test of goodness-of-fit of a Poisson point process model.
	  The observed and predicted distributions of the values of a 
	  spatial covariate are compared using either the
	  Kolmogorov-Smirnov, Cramer-Von Mises or Anderson-Darling test.

    o   berman.test
	  Replaces 'bermantest'.

    o   harmonise.fv
	  Make several functions compatible.

    o   simulate.lppm
	  Simulate a fitted point process model on a linear network.

    o   subset.ppp, subset.lpp, subset.pp3, subset.ppx
	  Methods for 'subset', for point patterns.

    o   closepairs.pp3, crosspairs.pp3
	  Low-level functions to find all close pairs of points in three dimensions

    o   volume.linnet
	  Method for the generic 'volume'. Returns the length of the linear network.

    o   padimage
	  Pad the border of a pixel image.

    o   as.layered
	  Convert spatial data to a layered object.

    o   panel.contour, panel.image, panel.histogram
	  Panel functions for 'pairs' plots.

    o   range.fv, min.fv, max.fv
	  Range, minimum and maximum of function values.

SIGNIFICANT USER-VISIBLE CHANGES

    o   ppm.formula
	  The left hand side of the formula can now be the name of 
	  an object in the list 'data', or an expression involving such objects.

    o   ppm
	  The right hand side of the formula can now include 
	  the symbol '.' representing all covariates in the list 'data'.

    o   ppm
	  New argument 'subset' makes it possible to fit the model
	  in a subset of the spatial domain defined by an expression.

    o   kppm
	  New option: method="palm", will fit the model by maximising Palm likelihood.

    o   pppdist
	  Substantially accelerated. 
	  New argument 'auction' controls choice of algorithm.

    o   rhohat
	  New arguments 'weights' and 'horvitz' for weighted calculations.

    o   persp.im
	  Surface heights and colours can now be controlled by different images.
	  Option to draw a grey apron around the sides of the perspective plot. 
	  Return value has a new attribute 'expand'.

    o   plot.listof
	  New arguments 'halign' and 'valign' give improved control
	  over the alignment of panels.

    o   plot.listof
	  If all components of the list are objects of class 'fv' 
	  representing functions, then if equal.scales=TRUE, these
	  functions will all be plotted with the same axes 
	  (i.e. the same xlim and the same ylim).

    o   envelope
	  The argument 'transform' is now processed by 'with.fv'
	  giving more options, such as 'transform=expression(. - r)'

    o   envelope, dclf.test, mad.test
	  One-sided tests and one-sided envelopes can now be produced, 
	  by specifying the argument 'alternative'.

    o   dclf.test, mad.test
	  A pointwise test at fixed distance 'r' can now be performed
	  by setting rinterval = c(r,r).

    o   envelope
	  New arguments 'fix.n' and 'fix.marks' for envelope.ppp and envelope.ppm
	  make it easy to generate simulated patterns conditional on the
	  total number of points, or on the number of points of each type.

    o   quadrat.test
	  Can now calculate the Cressie-Read test statistic
	  instead of the Pearson X2 statistic.

    o   Kres, Gres, Kcom, Gcom, psst, psstA, psstG
	  New argument 'model' makes it easier to generate simulation envelopes
	  of the residual summary functions.

    o   layered, plot.layered
	  The layer plot arguments can include the argument '.plot'
	  specifying a function to perform the plotting instead of the
	  generic 'plot'.

    o   deriv.fv
	  New arguments make it possible to differentiate a periodic function.

    o   ppm
	  Argument 'data' or 'covariates' can now include entries
	  which are not spatial covariates, provided they do not appear 
	  in the model formula.

    o   closepairs, crosspairs
	  These functions are now generic, with methods for 'ppp' and 'pp3'

    o   rLGCP
	  Updated to conform to new usage of RandomFields package.
	  Argument syntax has changed.
	  Now allows control over pixel resolution.

    o   bw.diggle
	  New arguments 'correction' and 'hmax' for controlling the calculation.

    o   predict.lppm
	  New argument 'new.coef' for computing predictions with a 
	  different vector of model coefficients.

    o   predict.ppm
	  If 'locations' is a pixel image, its pixels determine the
	  spatial locations for prediction.

    o   cut.ppp
	  Argument 'z' can now be a window.

    o   split.ppp
	  Argument 'f' can now be a window.

    o   print.ppm, summary.ppm, coef.summary.ppm
	  The table of parameter estimates, standard errors and confidence intervals
	  now also includes the value of the (signed square root) Wald test statistic.

    o   plot.im
	  Now automatically detects problems in some Windows graphics displays
	  and tries to avoid them.

    o   plot.im
	  The position of axis tick marks alongside the colour ribbon
	  can now be controlled using the parameter 'at' in the argument 'ribargs'.

    o   plot.ppp
	  Can now plot numeric marks using characters chosen by 'pch' or 'chars'
	  with size determined by mark value.

    o   plot.ppp
	  New argument 'meansize' for controlling mark scale.

    o   hsvim, rgbim
	  New argument 'autoscale' causes automatic scaling of colour channel values.

    o   plot.ppp
	  If type='n', a legend is now displayed when x is a marked point pattern.

    o   whist
	  Accelerated by a factor of 5.

    o   Fest, Jest
	  Accelerated by a factor of 2 to 3.

    o   fryplot
	  Accelerated.
	  Now displays a legend if the point pattern is marked.
	  Now handles numerical marks nicely.
	  New argument 'axes'.

    o   frypoints
	  Accelerated.
	  New arguments 'to', 'from' and 'dmax'.

    o   duplicated.ppp
	  New option: rule = 'unmark'

    o   rjitter
	  Argument 'radius' now has a default.

    o   Smooth.msr
	  New argument 'drop'

    o   LambertW
	  Now handles NA and infinite values.

    o   update.ppm
	  Now handles formulae with a left-hand side.

    o   raster.x, raster.y, raster.xy
	  These functions can now handle images, as well as masks.

    o   Smooth.ppp
	  If the mark values are exactly constant, the resulting smoothed values
	  are now exactly constant.

    o   eval.im, eval.fv, eval.fasp
	  Argument 'envir' can now be a list, instead of an environment.

    o   plot.ppp
	  The printout (of the resulting symbol map object)
	  now displays the numerical value of the mark scale.

    o   with.fv
	  Improved mathematical labels.

    o   plot.fv
	  Improved mathematical labels on x axis.

    o   ppm
	  Improved error messages.

    o   vcov.ppm
	  Computations greatly accelerated for Hybrid interactions
	  and for Area-interaction models.

    o   vcov.kppm
	  Computations greatly accelerated (when fast=TRUE)   

    o   interp.im
	  Argument 'x' can now be a point pattern.

    o   pool.envelope
	  Improved handling of text information.

    o   miplot
	  Improved layout.

    o   print.summary.ppp
	  Improved layout. 
	  Now respects spatstat.options('terse')

    o   print.profilepl
	  Improved layout. 
	  Now respects spatstat.options('terse')

    o   anova.ppm
	  Now respects spatstat.options('terse')

    o   print.fv, print.envelope
	  Now respect spatstat.options('terse') and options('width')

    o   summary.envelope
	  Now respects options('width')

    o   kstest, bermantest
	  These functions will soon be Deprecated.
	  They are retained only for backward compatibility.

BUG FIXES

    o   vcov.ppm
	  Sometimes gave wrong answers for Poisson models fitted by method='logi'.
	  Fixed.

    o   unnormdensity
	  If weights were missing, the density was normalised,
	  contrary to the documentation.
	  Fixed.

    o   logLik.ppm, anova.ppm, AIC
	  For models fitted by 'ippm', the number of degrees of freedom was incorrect.
	  Fixed.

    o   im.apply
	  Pixels outside the window were not assigned the value NA as they should.
	  Fixed.

    o   pixellate.owin
	  Crashed, unpredictably, if the pixel raster had unequal numbers
	  of rows and columns.
	  [Spotted by Rasmus Waagepetersen.]
	  Fixed.

    o   vcov.ppm
	  Crashed for pairwise interaction models fitted by method="logi".
	  Fixed.

    o   predict.ppm
	  Crashed for models fitted by method="logi"
	  if the model included external covariates.
	  Fixed.

    o   predict.ppm
	  Crashed if the argument 'covariates' or 'data' in the original call to 'ppm'
	  included entries that were not spatial covariates. [These entries were
	  ignored by ppm but caused predict.ppm to crash.]
	  Fixed.

    o   simulate.kppm, rNeymanScott, rThomas, rMatClust
	  Crashed randomly when simulating an inhomogeneous model.
	  [Spotted by Philipp Hunziker.]
	  Fixed.

    o   bw.diggle
	  In some extreme cases, generated an error message
	  about `NaN values in Foreign function call.'
	  [Spotted by Colin Beale.]
	  Fixed.

    o   textureplot
	  Crashed if 'spacing' was too large.
	  Fixed.

    o   superimpose.psp
	  Crashed if the result was empty.
	  Fixed.

    o   istat
	  Crashed with an error message about 'vars'.
	  Fixed.

    o   dirichlet, delaunay, delaunay.distance
	  Crashed in rare cases due to a problem in package 'deldir'. 
	  [Spotted by Pierre Legendre.]
	  Fixed.

    o   rgbim, hsvim
	  Crashed if any argument was constant.
	  Fixed.

    o   scaletointerval
	  Crashed if x was constant.
	  Fixed.

    o   linnet, [.linnet
	  Crashed if the result contained only a single vertex.
	  [Spotted by Daniel Esser.]
	  Fixed.

    o   plot.fv
	  If some of the function values were NA,
	  they were replaced by fictitious values
	  (by linearly interpolating).
	  Fixed.

    o   crossdist.ppp
	  Ignored argument 'squared' if periodic=FALSE.
	  [Spotted by Mike Porter.]
	  Fixed.

    o   marks<-.ppp
	  Ignored argument 'drop'.
	  [Spotted by Oscar Garcia.]
	  Fixed.

    o   update.ppm
	  Sometimes did not respect the argument 'use.internal'.
	  Fixed.

    o   plot.rhohat
	  Did not respect the argument 'limitsonly'.
	  Fixed.

    o   contour.im
	  Argument 'axes' defaulted to TRUE, but FALSE was intended.
	  Fixed.

    o   print.hyperframe, as.data.frame.hyperframe
	  Column names were mangled if the hyperframe had a single row.
	  Fixed.

    o   as.psp.data.frame
	  Generated a warning about partially-matched names in a data frame.
	  [Spotted by Eric Gilleland.]
	  Fixed.

    o   plot.leverage.ppm
	  Generated a warning from 'contour.default'
	  if the leverage function was constant.
	  Fixed.

    o   plot.diagppm
	  Issued warnings about unrecognised graphics parameters.
	  Fixed.

    o   update.symbolmap
	  Discarded information about the range of input values.
	  Fixed.

    o   plot.fv
	  Label for y axis was garbled, if argument 'shade' was given.
	  Fixed.

    o   plot.ppp
	  The legend was sometimes plotted when it should not have been 
	  (e.g. when add=TRUE).
	  Fixed.

    o   plot.listof, plot.im
	  In an array of plots, containing both images and other spatial objects,
	  the titles of the panels were not correctly aligned.
	  Fixed.

    o   plot.tess, plot.quadratcount
	  Ignored arguments like 'cex.main'.
	  Fixed.

    o   iplot
	  Navigation buttons (Left, Right, Up, Down, Zoom In, Zoom Out)
	  did not immediately refresh the plot.
	  Fixed.

    o   iplot.layered
	  Reported an error 'invalid argument type' if all layers were deselected.
	  Fixed.

                 Changes in version 1.37-0 (2014-05-09)                 

OVERVIEW

    o   Ege Rubak is now a joint author of spatstat. 

    o   We thank Peter Forbes, Tom Lawrence and Mikko Vihtakari for contributions.

    o   Spatstat now exceeds 100,000 lines of code.

    o   New syntax for point process models (ppm, kppm, lppm)
	    equivalent to syntax of lm, glm, ...

    o   Covariates in ppm and kppm can now be tessellations.

    o   Confidence intervals and prediction intervals for fitted models.

    o   Quasirandom point patterns and sequences.

    o   Plots using texture fill.

    o   Support for mappings from data to graphical symbols and textures.

    o   Automatic re-fitting of model in Ginhom, Kinhom, Finhom, Jinhom.

    o   Support for Mixed Poisson distribution.

    o   Interpretation of mark scale parameters has changed in plot.ppp

    o   Syntax of multitype interactions (eg MultiStrauss) has changed.

    o   Bug fix in Metropolis-Hastings simulation of 'StraussHard' models

    o   Changed default behaviour of perfect simulation algorithms.

    o   Improvements to layout of text output.

    o   Version nickname: 'Model Prisoner'

NEW CLASSES

    o   symbolmap
	  An object of class 'symbolmap' represents a mapping
	  from data to graphical symbols

    o   texturemap
	  An object of class 'texturemap' represents a mapping
	  from data to graphical textures.

NEW FUNCTIONS

    o   split.hyperframe, split<-.hyperframe
	  methods for split and split<- for hyperframes.

    o   dmixpois, pmixpois, qmixpois, rmixpois
	  (log-)normal mixture of Poisson distributions.

    o   vdCorput, Halton, Hammersley, rQuasi
	  quasirandom sequences and quasirandom point patterns.

    o   Smoothfun
	  create a function(x,y) equivalent to the result of Smooth.ppp

    o   minnndist, maxnndist
	  Faster ways to compute min(nndist(X)), max(nndist(X))

    o   add.texture
	  Draw a simple texture inside a specified region.

    o   textureplot
	  Display a factor-valued pixel image using texture fill.

    o   texturemap
	  Create a texture map

    o   plot.texturemap
	  Plot a texture map in the style of a legend

    o   symbolmap
	  Create a symbol map

    o   update.symbolmap
	  Modify a symbol map

    o   invoke.symbolmap
	  Apply symbol map to data values, and plot them

    o   plot.symbolmap 
	  Plot the symbol map in the style of a legend

    o   as.owin.boxx
	  Converts a 'boxx' to an 'owin' if possible.

    o   ellipse
	  Create an elliptical window.

    o   clickbox
	  Interactively specify a rectangle, by point-and-click on a graphics device.

    o   complementarycolour
	  Compute the complementary colour value of a given colour value,
	  or the complementary colour map of a given colour map.

    o   gauss.hermite
	  Gauss-Hermite quadrature approximation to the expectation
	  of any function of a normally-distributed random variable.	

    o   boundingbox
	  Generic function, replaces bounding.box

    o   edges
	  Extract boundary edges of a window. 
	  Replaces and extends 'as.psp.owin'

    o   pixelcentres
	  Extract centres of pixels as a point pattern.

SIGNIFICANT USER-VISIBLE CHANGES

    o   ppm, kppm, lppm
	  NEW SYNTAX FOR POINT PROCESS MODELS
	  The model-fitting functions 'ppm', 'kppm' and 'lppm' now accept
	  a syntax similar to 'lm' or 'glm', for example  ppm(X ~ Z), 
	  but still accept the older syntax ppm(X, ~Z). 
	  To support both kinds of syntax, the functions 'ppm' and 'kppm'
	  are now generic, with methods for the classes 'formula', 'ppp' and 'quad'. 
	  The 'formula' method handles a syntax like ppm(X ~ Z) while the
	  'ppp' method handles the old syntax ppm(X, ~Z).
	  Similarly 'lppm' is generic with methods for 'formula' and 'lpp'.

    o   ppm, kppm, lppm
	  Covariates appearing in the model formula can be objects 
	  which exist in the R session, instead of always having to be
	  elements of the list `covariates'.

    o   ppm.formula, kppm.formula, lppm.formula
	  Formulae involving polynom() are now expanded, symbolically,
	  so that polynom(x, 3) becomes x + I(x^2) + I(x^3) 
	  and polynom(x,y,2) becomes x + y + I(x^2) + I(x*y) + I(y^2).
	  This neatens the model output, and also makes it possible
	  for anova() and step() to add or delete single terms in the polynomial.

    o   predict.ppm
	  New argument 'interval' allows confidence intervals or prediction intervals
	  to be calculated.

    o   predict.ppm
	  New argument 'total' allows for prediction of the total number of points
	  in a specified region.

    o   plot.ppp, plot.lpp
	  For marked point patterns, a legend is automatically added
	  to the plot, by default. Arguments have changed: new arguments
	  include parameters of the legend, and an optional symbol map.
	  Result has changed: it is now an object of class 'symbolmap'.

    o   plot.ppp, plot.lpp
	  Interpretation of the parameters 'markscale' and 'maxsize' 
	  has changed. The size of a circle in the plot is now defined 
	  as the circle's diameter instead of its radius. (Size of
	  a square is measured, as before, by its side length). 

    o   parres
	  Now handles the case where the fitted model is not separable
	  but its restriction to the given 'subregion' is separable.

    o   envelope
	  Now issues a warning if the usage of envelope() appears to be `invalid' 
	  in the sense that the simulated patterns and the data pattern
	  have not been treated equally.

    o   Kinhom, Finhom, Ginhom, Jinhom
	  New argument 'update'.
	  If 'lambda' is a fitted model (class ppm or kppm) and update=TRUE,
	  the model is re-fitted to the data pattern, before the intensities
	  are computed.

    o   rDiggleGratton, rDGS, rHardcore, rStrauss, rStraussHard
	  By default the point pattern is now generated on
	  a larger window, and trimmed to the original window.
	  New argument expand=TRUE.

    o   MultiStrauss, MultiHard, MultiStraussHard
	  The syntax of these functions has changed.
	  The new code should still accept the old syntax.

    o   rhohat
	  rhohat.ppp and rhohat.quad have new argument 'baseline'

    o   ippm
	  Algorithm improved. Argument syntax changed.

    o   default.dummy, quadscheme
	  Dummy points can now be generated by a quasirandom sequence.

    o   plot.owin
	  The window can now be filled with one of 8 different textures.
	  Arguments changed. 

    o   ppm, kppm
	  Covariates in the model can now be tessellations.

    o   [.im
	  New argument 'tight' allows the resulting image to be trimmed 
	  to the smallest possible rectangle.

    o   [.psp, rlinegrid, rpoisline
	  These functions now handle binary mask windows.

    o   rotate
	  The user can specify the centre of rotation.

    o   rescale
	  rescale() and all its methods now have argument 'unitname'
	  which can be used to change the name of the unit of length.

    o   anova.ppm
	  Output format has been improved. 
	  Number of columns of result has changed.

    o   print.ppp, print.summary.ppp, print.owin, print.summary.owin,
	  print.im, print.summary.im, print.fv, print.msr, print.profilepl
	  These functions now avoid over-running the text margin
	  (i.e. they respect options('width') where possible).

    o   layerplotargs<-
	  Now handles any spatial object, converting it to a 'layered' object.

    o   effectfun
	  Improved display in case se.fit=TRUE.

    o   scaletointerval
	  New argument 'xrange'

    o   contour.im
	  New argument 'show.all'.
	  Default value of 'axes' changed to FALSE.

    o   identify.ppp
	  Now handles multivariate marks. 

    o   plot.listof
	  Improved layout.
	  New arguments 'hsep', 'vsep'.
	  Argument 'mar.panel' may have length 1, 2 or 4.

    o   plot.splitppp
	  This function is no longer identical to plot.listof.
	  Instead it is a much simpler function which just
	  calls plot.listof with equal.scales=TRUE.

    o   anova.ppm
	  Output is neater.

    o   plot.layered
	  New argument 'do.plot'

    o   plot.psp
	  New argument 'do.plot'

    o   as.psp.owin
	  New argument 'window'

    o   plot.im, contour.im, textureplot
	  New argument 'clipwin'

    o   plot.ppp
	  New argument 'clipwin'

    o   plot.msr
	  New argument 'how' allows density to be plotted as image and/or contour

    o   diagnose.ppm, plot.diagppm
	  More options for 'plot.neg'

    o   plot.leverage.ppm, plot.influence.ppm, plot.msr
	  Argument 'clipwin' can now be used to restrict the display
	  to a subset of the full data.

    o   [.hyperframe, [<-.hyperframe, $.hyperframe, $<-.hyperframe
	  These functions are now documented.

    o   leverage.ppm, influence.ppm, dfbetas.ppm
	  Resulting objects are now smaller (in memory size).

    o   print.ppm
	  Now indicates whether the irregular parameters 'covfunargs'
	  were optimised (by profilepl or ippm) or whether they were simply
	  provided by the user.

    o   plot.ppp
	  A point pattern with numerical marks can now be plotted as
	  filled dots with colours determined by the marks, 
	  by setting pch=21 and bg=<colourmap>

    o   colourmap
	  Now handles dates and date-time values (of class 'Date' or 'POSIXt').

    o   plot.ppp, print.ppp, summary.ppp
	  Improved handling of dates and date-time values 
	  (of class 'Date' or 'POSIXt') in the marks of a point pattern.

    o   cut.im
	  Now refuses to handle images whose pixel values are
	  factor, logical or character.

    o   centroid.owin
	  New argument 'as.ppp'

    o   superimpose
	  Improved default names for columns of marks.

    o   Softcore()
	  Improved printout.

    o   kppm, lgcp.estpcf, lgcp.estK
	  Adjusted to new structure of RandomFields package.
	  No change in syntax.

    o   data(murchison)
	  This dataset now belongs to class 'listof' so that it can be
	  plotted directly.

    o   data(clmfires)
	  The format of the covariate data has changed.
	  The objects 'clmcov100' and 'clmcov200' are now 
	  elements of a list 'clmfires.extra'.

    o   bounding.box
	  This function is now Deprecated; it has been replaced 
	  by the generic boundingbox().

    o   as.psp.owin 
	  This function is now Deprecated; it has been replaced 
	  and extended by the function edges().

    o   plot.kstest
	  Changed defaults so that the two curves are distinguishable.

    o   with.fv
	  Improved mathematical labels.

BUG FIXES

    o   intensity.quadratcount
	  Values were incorrect for a rectangular tessellation
	  (the matrix of intensities was transposed).
	  Fixed.

    o   rmh, simulate.ppm
	  Simulation of the Strauss-hard core model (StraussHard) was incorrect
	  (intensity of the simulated process was about 15% too low).
	  Bug introduced in spatstat 1.31-0 (January 2013).

    o   intensity.quadratcount
	  Crashed for a rectangular tessellation with only a single row or column.
	  Fixed.

    o   model.images.ppm
	  Crashed sometimes if the argument W was given.
	  Fixed.

    o   eval.im
	  Crashed when applied to images with only a single row or column.
	  Fixed.

    o   ppp, marks<-.ppp
	  If the marks were a vector of dates, they were erroneously 
	  converted to numbers.
	  Fixed.

    o   ippm
	  Crashed if the model formula included an offset term
	  that was not a function.
	  Fixed.

    o   leverage.ppm
	  Crashed sometimes when the model had irregular parameters ('covfunargs').
	  Fixed.

    o   residuals.ppm
	  Crashed sometimes when type='score'.
	  Fixed.

    o   scaletointerval
	  Did not handle dates and date-time values correctly.
	  Fixed.

    o   rbind.hyperframe, as.list.hyperframe
	  Gave incorrect results for hyperframes with 1 row.
	  Fixed.

    o   Kinhom
	  Did not renormalise the result (even when renormalise=TRUE), in some cases.
	  Spotted by Peter Forbes.
	  Fixed.

    o   disc
	  If mask=TRUE the disc was erroneously clipped to the square [-1,1] x [-1,1].
	  Fixed.

    o   plot.fv
	  Sometimes shaded the wrong half of the graph 
	  when the 'shade' coordinates were infinite.
	  Fixed.

    o   print.ppm
	  Gave an error message if the coefficient vector had length zero.
	  Fixed.

    o   vcov.ppm
	  Gave an error message if the coefficient vector had length zero.
	  Fixed.

    o   plot.distfun, as.im.distfun
	  These functions effectively ignored the argument 'invert' 
	  in the original call to distfun.
	  Fixed.

    o   plot.msr
	  Ignored certain additional arguments such as 'pch'.
	  Fixed.

    o   cut.im
	  Crashed if the image had 1 row or 1 column of pixels.
	  Fixed.

    o   iplot.ppp
	  Crashed with message about missing object 'vals'.
	  Fixed.

    o   effectfun
	  Demanded a value for every covariate supplied in the original call to ppm, 
	  even for covariates which were not used in the model.
	  Fixed.

    o   plot.listof, plot.hyperframe
	  When plotting 3D point patterns (class pp3), these functions
	  issued warnings about 'add' being an unrecognised graphics argument.
	  Fixed.

                 Changes in version 1.36-0 (2014-02-18)                 

OVERVIEW

    o   We thank Sebastian Meyer, Kevin Ummer, Jean-Francois Coeurjolly,
	  Ege Rubak, Rasmus Waagepetersen, Oscar Garcia and Sourav Das
	  for contributions.

    o   Important change to package dependencies.

    o   Geometrical inconsistencies in polygons are now repaired automatically.

    o   Improved quadrature schemes and reduced bias in ppm.

    o   New vignette 'Summary of Recent Changes to Spatstat'.

    o   Approximation to K function and pcf for Gibbs models.

    o   Counterpart of 'apply' for lists of images.

    o   Hexagonal grids and tessellations.

    o   Extensions to scan test and Allard-Fraley cluster set estimator.

    o   Change the parameters of a fitted model before simulating it.

    o   Accelerated Kest, Kinhom for rectangular windows.

    o   Extensions and improvements to plotting functions.

    o   Improvements to labelling of 'fv' objects.

    o   New demo of summary functions.

    o   More methods for 'intensity'.

    o   Version nickname: 'Intense Scrutiny'

NEW FUNCTIONS

    o   Kmodel.ppm, pcfmodel.ppm
	  Compute approximation to K-function or pair correlation function
	  of a Gibbs point process model.

    o   im.apply
	  Apply a function to corresponding pixel values in several images.

    o   hexgrid, hextess
	  Create a hexagonal grid of points, or a tessellation of hexagonal tiles

    o   shift.tess, rotate.tess, reflect.tess, scalardilate.tess, affine.tess
	  Apply a geometrical transformation to a tessellation.

    o   quantile.ewcdf
	  Extract quantiles from a weighted cumulative distribution function.

    o   scanLRTS
	  Evaluate the spatially-varying test statistic for the scan test.

    o   pcfmulti
	  General multitype pair correlation function

    o   intensity.splitppp
	  Estimate intensity in each component of a split point pattern.

    o   intensity.quadratcount
	  Use quadrat counts to estimate intensity in each quadrat.

    o   as.owin.quadratcount, as.owin.quadrattest
	  Extract the spatial window in which quadrat counts were performed.

    o   reload.or.compute
	  Utility function for R scripts: 
	  either reload results from file, or compute them.

    o   to.grey
	  Convert colour to greyscale.

    o   Smooth.im
	  Method for Smooth() for pixel images. Currently identical to blur().

    o   demo(sumfun)
	  Demonstration of nonparametric summary functions in spatstat.

SIGNIFICANT USER-VISIBLE CHANGES

    o   Package Dependencies
	  spatstat now "Imports" (rather than "Depends" on) 
	  the libraries mgcv, deldir, abind, tensor, polyclip.
	  This means that these libraries are not accessible to the user
	  unless the user explicitly loads them by typing 'library(mgcv)' and so on.

    o   owin, as.owin
	  Polygon data are no longer subjected to strict checks on 
	  geometrical validity (self-crossing points, overlaps etc.)
	  Instead, polygon geometry is automatically repaired.

    o   ppm
	  The default quadrature scheme for a point pattern
	  has been improved (in the case of a non-rectangular window)
	  to remove a possible source of bias.

    o   Performance 
	  various parts of spatstat now run slightly faster.

    o   scan.test 
	  Now handles multiple values of circle radius 'r'.

    o   plot.scan.test, as.im.scan.test
	  These functions can now give the optimal value of circle radius 'r'.

    o   pcfcross, pcfdot
	  Algorithms have been reimplemented using a single-pass kernel smoother
	  and now run much faster. Bandwidth selection rule improved.

    o   plot.listof, plot.splitppp
	  Default behaviour has changed: panels are now plotted on different scales. 

    o   plot.listof, plot.splitppp
	  When 'equal.scales=TRUE' the panels are plotted on exactly equal scales
	  and are exactly aligned (under certain conditions).

    o   ppp, marks.ppp, marks<-.ppp
	  New argument 'drop' determines whether a data frame with a single column
	  will be converted to a vector.

    o   simulate.ppm, rmh.ppm, rmhmodel.ppm
	  New argument 'new.coef' allows the user to change the parameters
	  of a fitted model, before it is simulated.

    o   logLik.ppm
	  New argument 'new.coef' allows the user to evaluate the 
	  loglikelihood for a different value of the parameter.

    o   clusterset
	  The argument 'result' has been renamed 'what'.
	  It is now possible to give multiple values to 'what'
	  so that both types of result can be computed together.

    o   residuals.ppm
	  Argument 'coefs' has been renamed 'new.coef' for consistency
	  with fitted.ppm etc. 

    o   residuals.ppm
	  If drop=TRUE the window associated with the residuals
	  is now taken to be the domain of integration of the composite likelihood.

    o   intensity.ppp
	  Now has argument 'weights'

    o   density.ppp, Smooth.ppp, markmean, markvar, intensity.ppp
	  Argument 'weights' can now be an 'expression'.

    o   pcf
	  New argument 'domain' causes the computation to be restricted to 
	  a subset of the window.

    o   nnclean
	  The result now has attributes which give the fitted parameter values,
	  information about the fitting procedure, and the histogram bar heights.

    o   nnclean
	  Extra arguments are now passed to hist.default.

    o   plot.tess
	  For a tessellation represented by a pixel image, 
	  plot.tess no longer treats the pixel labels as palette colours.

    o   relrisk
	  New argument 'case' allows the user to specify which mark value
	  corresponds to the cases in a case-control dataset.

    o   Kinhom
	  Now accepts correction="good" 

    o   spatstat.options
	  New option ('monochrome') controls whether plots generated by spatstat
	  will be displayed in colour or in greyscale. This will eventually be
	  applied to all plot commands in spatstat. 

    o   plot.im, persp.im, contour.im, plot.owin, plot.psp, plot.fv, plot.fasp
	  These functions now obey spatstat.options('monochrome')

    o   plot.ppp, plot.owin, plot.im, plot.psp, plot.tess, plot.layered
	  New universal argument 'show.all' determines what happens
	  when a plot is added to an existing plot. If show.all = TRUE
	  then everything is plotted, including the main title and colour ribbon.

    o   plot.ppp
	  New argument 'show.window' 

    o   plot.im 
	  New arguments 'add' and 'do.plot'.
	  More arguments recognised by 'ribargs'

    o   plot.layered
	  New arguments 'add', 'main' 
	  Better argument handling.

    o   plot.fv
	  Improved handling of argument 'shade'

    o   layered, layerplotargs, plot.layered
	  The plotting argument can now be a list of length 1,
	  which will be replicated to the correct length.

    o   varblock
	  Ugly legends have been repaired.

    o   quad.ppm
	  New argument 'clip'

    o   edge.Trans
	  New arguments 'dx', 'dy'

    o   disc
	  Argument 'centre' can be in various formats.

    o   affine, shift
	  Argument 'vec' can be in various formats.

    o   Geyer, BadGey
	  A warning is no longer issued when the parameter 'sat' is fractional.

    o   adaptive.density
	  Now has argument 'verbose'

    o   Smooth.ppp
	  'sigma' is now a formal argument of Smooth.ppp

    o   plot.quadratcount, plot.quadrattest
	  These functions have now been documented.

    o   Summary functions and envelopes
	  Improved mathematical labels in plots.

    o   Kest
	  Accelerated, in the case of a rectangular window.

    o   Kscaled
	  Argument 'lambda' can now be a fitted model (class ppm)

    o   print.fv
	  Improved layout.

    o   plot.bermantest
	  Improved graphics.

    o   which.max.im
	  This function is now deprecated.
	  which.max.im(x) is superseded by im.apply(x, which.max)

    o   smooth.ppp, smooth.fv, smooth.msr
	  These functions are now deprecated, in favour of 'Smooth' with a capital 'S'

BUG FIXES

    o   bw.ppl
	  Crashed if the point pattern had multiple points at the same location.
	  Fixed.

    o   quantile
	  Crashed when applied to the result of 'ewcdf'.
	  Fixed.

    o   marks<-.ppp
	  Crashed with a message about 'unrecognised format'
	  if the current or replacement values of marks
	  were date/time values (belonging to class 'Date' or 'POSIXt').
	  Fixed.

    o   plot.im
	  Crashed in case log=TRUE if the window was not a rectangle.
	  Fixed.

    o   vcov.ppm
	  Crashed sometimes for models with a hard core term
	  (Hardcore, StraussHard, MultiHard or MultiStrauss interactions).
	  Spotted by Rasmus Waagepetersen.
	  Fixed.

    o   multiplicity.data.frame
	  Results were incorrect and included NA's (spotted by Sebastian Meyer).
	  Fixed.

    o   markvar
	  Values were incorrect.
	  Fixed.

    o   Smooth.ppp
	  Ignored argument 'diggle'.
	  Fixed.

    o   rotate.im, affine.im
	  Factor-valued images were not handled correctly.
	  Fixed.

    o   shift.layered
	  If argument 'origin' was used, different layers were shifted by 
	  different amounts.
	  Fixed.

    o   tile.areas
	  Sometimes returned a list instead of a numeric vector.
	  Fixed.

    o   print.ppp
	  If the marks were date/time values (belonging to class 'Date' or 'POSIXt'),
	  print.ppp reported that they were double precision numbers.
	  Fixed.

    o   plot.layered
	  Graphics were mangled if the argument 'add=FALSE' was given explicitly.
	  Fixed.

    o   Smooth.ppp
	  The argument 'sigma' was only recognised if it was explicitly named.
	  For example in 'Smooth(X, 5)' the '5' was ignored.
	  Fixed.

    o   clusterset
	  The bounding frame of the result was smaller than the
	  original bounding frame of the point pattern dataset,
	  when result="domain" and exact=TRUE.
	  Fixed.

    o   plot.im
	  Ignored argument 'col' if it was a 'function(n)'.
	  Fixed.

    o   Kinhom
	  Ignored argument 'correction' if there were more than 1000 points.
	  Fixed.

    o   [.fv
	  Mangled the plot label for the y axis.
	  Fixed.

    o   cbind.fv
	  Mangled the plot label for the y axis.
	  Fixed.

    o   plot.envelope
	  Main title was always 'x'.
	  Fixed.

    o   print.ppp
	  Ran over the right margin.
	  Fixed.

    o   union.owin, intersect.owin, setminus.owin
	  Sometimes deleted the name of the unit of length.
	  Fixed.

                 Changes in version 1.35-0 (2013-12-12)                 

OVERVIEW

    o   We thank Melanie Bell, Leanne Bischof, Ida-Maria Sintorn,
	    Ege Rubak, Martin Hazelton, Oscar Garcia, 
	    Rasmus Waagepetersen, Abdollah Jalilian
	    and Jens Oehlschlaegel for contributions.

    o   Support for analysing replicated spatial point patterns.

    o   New vignette on analysing replicated spatial point patterns.

    o   Objective function surface plots.

    o   Estimator of point process intensity using nearest neighbour distances.

    o   Improved estimator of pair correlation function.

    o   Four new datasets. 

    o   Simple point-and-click interface functions for general use.

    o   More support for fv objects.

    o   More support for ppx objects.

    o   Extensions to nearest neighbour functions.

    o   Morphological operations accelerated.

    o   Bug fix to pair correlation functions.

    o   Bug fix to k-th nearest neighbour distances

    o   Version nickname: 'Multiple Personality'

NEW CLASSES

    o   mppm
	 An object of class 'mppm' represents a Gibbs point process model
	 fitted to several point pattern datasets. The point patterns may
	 be treated as independent replicates of the same point process,
	 or as the responses in an experimental design, so that the 
	 model may depend on covariates associated with the design.
	 Methods for this class include print, plot, predict, anova and so on.

    o   objsurf
	 An object of class 'objsurf' contains values of the likelihood 
	 or objective function in a neighbourhood of the maximum.

    o   simplepanel
	 An object of class 'simplepanel' represents a spatial arrangement of buttons
	 that respond to mouse clicks, supporting a simple, robust graphical interface.

NEW FUNCTIONS

    o   mppm
	 Fit a Gibbs model to several point patterns.
	 The point pattern data may be organised as a designed experiment
	 and the model may depend on covariates associated with the design.

    o   anova.mppm
	 Analysis of Deviance for models of class mppm

    o   coef.mppm
	 Extract fitted coefficients from a model of class mppm

    o   fitted.mppm
	 Fitted intensity or conditional intensity for a model of class mppm

    o   kstest.mppm
	 Kolmogorov-Smirnov test of goodness-of-fit for a model of class mppm

    o   logLik.mppm
	 log likelihood or log pseudolikelihood for a model of class mppm

    o   plot.mppm
	 Plot the fitted  intensity or conditional intensity of a model of class mppm

    o   predict.mppm
	 Compute the fitted  intensity or conditional intensity 
	 of a model of class mppm

    o   quadrat.test
	 Quadrat counting test of goodness-of-fit for a model of class mppm

    o   residuals.mppm
	 Point process residuals for a model of class mppm

    o   subfits
	 Extract point process models for each individual point pattern dataset,
	 from a model of class mppm

    o   vcov.mppm
	 Variance-covariance matrix for a model of class mppm

    o   integral.msr
	 Integral of a measure.

    o   objsurf
	 For a model fitted by optimising an objective function, this command
	 computes the objective function in a neighbourhood of the optimal value.

    o   contour.objsurf, image.objsurf, persp.objsurf, plot.objsurf
	 Plot an 'objsurf' object.

    o   fvnames
	 Define groups of columns in a function value table, for use in plot.fv, etc

    o   multiplicity
	 New generic function for which multiplicity.ppp is a method.

    o   unique.ppx, duplicated.ppx, multiplicity.ppx
	 Methods for unique(), duplicated() and multiplicity() for 'ppx' objects.
	 These also work for 'pp3' and 'lpp' objects.

    o   closepairs, crosspairs, closepaircounts, crosspaircounts
	 Low-level functions for finding all close pairs of points 

    o   nndensity 
	 Estimate point process intensity using k-th nearest neighbour distances

    o   simplepanel, run.simplepanel
	 Support for a simple point-and-click interface for general use.

NEW DATASETS

    o   pyramidal
	  Diggle-Lange-Benes data on pyramidal neurons in cingulate cortex.
	  31 point patterns divided into 3 groups.

    o   waterstriders
	  Nummelin-Penttinen waterstriders data.
	  Three independent replicates of a point pattern formed by insects.

    o   simba
	  Simulated data example for mppm.
	  Two groups of point patterns with different interpoint interactions.

    o   demohyper
	  Simulated data example for mppm.
	  Point patterns and pixel image covariates, in two groups
	  with different regression coefficients.

SIGNIFICANT USER-VISIBLE CHANGES

    o   plot.hyperframe
	  The argument 'e' now has a different format.
	  Instead of plot(h, plot(XYZ)) one must now type plot(h, quote(plot(XYZ)))
	  This is necessary in order to avoid problems with 'S4 method dispatch'.

    o   pcf.ppp, pcfinhom
	  New argument 'divisor' enables better performance of the estimator
	  of pair correlation function for distances close to zero.

    o   applynbd
	  The arguments N, R and criterion may now be specified together.

    o   markstat
	  The arguments N and R may now be specified together.

    o   ppx
	  New argument 'simplify' allows the result to be converted to
	  an object of class 'ppp' or 'pp3' if appropriate.

    o   as.function.fv
	  Now allows multiple columns to be interpolated

    o   multiplicity.ppp
	  This function is now a method for the generic 'multiplicity'.
	  It has also been accelerated.

    o   nnfun.ppp, distfun.ppp
	  New argument 'k' allows these functions to compute k-th nearest neighbours.

    o   rVarGamma, kppm, vargamma.estK, vargamma.estpcf
	  New argument 'nu.pcf' provides an alternative way to specify
	  the kernel shape in the VarGamma model, instead of the existing
	  argument 'nu.ker'. Function calls that use the ambiguous argument
	  name 'nu' will no longer be accepted.

    o   nnmap
	  Image is now clipped to the original window.

    o   dilation, erosion, opening, closing
	  Polygonal computations greatly accelerated.

    o   plot.colourmap
	  Improved appearance and increased options, for discrete colourmaps.

    o   plot.msr
	  Improved appearance

    o   plot.ppp, plot.owin
	  An `empty' plot can now be generated by setting type="n"

    o   nndist.ppp, nnwhich.ppp, nncross.ppp
	  Column names of the result are now more informative.

BUG FIXES

    o   nncross.ppp
	  Results were completely incorrect when k > 1.
	  Spotted by Jens Oehschlaegel. 
	  Bug was introduced in spatstat 1.34-1. 
	  Fixed.

    o   rVarGamma
	  Simulations were incorrect; they were generated using the wrong value
	  of the parameter 'nu.ker'. Spotted by Rasmus Waagepetersen and
	  Abdollah Jalilian. Bug was always present.		    
	  Fixed.

    o   pair correlation functions (pcf.ppp, pcfdot, pcfcross, pcfinhom, ...)
	  The result had a negative bias at the maximum 'r' value,
	  because contributions to the pcf estimate from interpoint distances
	  greater than max(r) were mistakenly omitted. 
	  Spotted by Rasmus Waagepetersen and Abdollah Jalilian. 
	  Bug was always present.
	  Fixed.

    o   demo(spatstat)
	  This demonstration script had some unwanted side-effects, such as
	  rescaling the coordinates of standard datasets 'bramblecanes', 
	  'amacrine' and 'demopat', which caused the demonstration to crash 
	  when it was repeated several times, and caused errors in demo(data).
	  Fixed.

    o   rmh
	  Visual debugger crashed sometimes with message 'XI not found'.
	  Fixed.

    o   predict.ppm
	  Crashed if the model was fitted using 'covfunargs'.
	  Fixed.

    o   bounding.box
	  Crashed if one of the arguments was NULL.
	  Fixed.

    o   multiplicity.ppp
	  Did not handle data frames of marks. 
	  Fixed.

                 Changes in version 1.34-1 (2013-11-03)                 

OVERVIEW

    o   We thank Kurt Hornik, Ted Rosenbaum, Ege Rubak and Achim Zeileis
	   for contributions.

    o   Important bug fix.

SIGNIFICANT USER-VISIBLE CHANGES

    o   as.box3
	  Now accepts objects of class 'ppx' or 'boxx'.

    o   crossdist.ppp, crossdist.pp3, crossdist.default
	  New argument 'squared' allows the squared distances to be computed
	  (saving computation time in some applications)

BUG FIXES

    o   union.owin, is.subset.owin, dilation.owin
	  Results were sometimes completely wrong for polygons with holes.
	  Spotted by Ted Rosenbaum.
	  Fixed.

    o   psstA, areaLoss
	  Crashed in some cases, with error message
	  'Number of items to replace is not a multiple of replacement length'. 
	  Spotted by Achim Zeileis.
	  Fixed.

                 Changes in version 1.34-0 (2013-10-24)                 

OVERVIEW

    o   We thank Andrew Bevan, Ege Rubak, Aruna Jammalamadaka, 
	  Greg McSwiggan, Jeff Marcus, Jose M Blanco Moreno,
	  and Brian Ripley for contributions.

    o   spatstat and all its dependencies are now Free Open Source.

    o   spatstat does not require the package 'gpclib' any more.

    o   spatstat now depends on the packages 'tensor', 'abind' and 'polyclip'

    o   polygon clipping is now enabled always.

    o   Substantially more support for point patterns on linear networks.

    o   Faster computations for pairwise interaction models.

    o   Bug fixes in nearest neighbour calculations.

    o   Bug fix in leverage and influence diagnostics.

    o   Version nickname: "Window Cleaner"

    o   spatstat now requires R version 3.0.2 or later

NEW FUNCTIONS

    o   as.lpp
	  Convert data to a point pattern on a linear network.

    o   distfun.lpp
	  Distance function for point pattern on a linear network.

    o   eval.linim
	  Evaluate expression involving pixel images on a linear network.

    o   linearKcross, linearKdot, linearKcross.inhom, linearKdot.inhom
	  Multitype K functions for point patterns on a linear network

    o   linearmarkconnect, linearmarkequal
	  Mark connection function and mark equality function 
	  for multitype point patterns on a linear network

    o   linearpcfcross, linearpcfdot, linearpcfcross.inhom, linearpcfdot.inhom
	  Multitype pair correlation functions for point patterns on a linear network

    o   linfun
	  New class of functions defined on a linear network

    o   nndist.lpp, nnwhich.lpp, nncross.lpp
	  Methods for nndist, nnwhich, nncross for point patterns on a linear network

    o   nnfun.lpp
	  Method for nnfun for point patterns on a linear network

    o   vcov.lppm
	  Variance-covariance matrix for parameter estimates of a fitted
	  point process model on a linear network.

    o   bilinearform
	  Computes a bilinear form 

    o   tilenames, tilenames<-
	  Extract or change the names of tiles in a tessellation.

SIGNIFICANT USER-VISIBLE CHANGES

    o   package dependencies 
	  Previous versions of spatstat used the package 'gpclib' 
	  to perform geometrical calculations on polygons.
	  Spatstat now uses the package 'polyclip' for polygon calculations instead.

    o   free open-source licence
	  The restrictive licence conditions of 'gpclib' no longer apply 
	  to users of spatstat. Spatstat and all its dependencies are now
	  covered by a free open-source licence.

    o   polygon clipping
	  In previous versions of spatstat, geometrical calculations
	  on polygons could be performed 'exactly' using gpclib
	  or 'approximately' using pixel discretisation. 
	  Polygon calculations are now always performed 'exactly'.

    o   intersect.owin, union.owin, setminus.owin
	  If A and B are polygons, the result is a polygon.

    o   erosion, dilation, opening, closing
	  If the original set is a polygon, the result is a polygon.

    o   intersect.tess, dirichlet
	  The tiles of the resulting tessellation are polygons 
	  if the input was polygonal.

    o   plot.owin
	  Polygons with holes can now be plotted with filled colours
	  on any device.

    o   lppm
	  New arguments 'eps' and 'nd' control the quadrature scheme.

    o   pairwise interaction Gibbs models
	  Many calculations for these models have been accelerated.

BUG FIXES

    o   nncross.pp3
	  Values were completely incorrect in some cases.
	  Usually accompanied by a warning about NA values.
	  (Spotted by Andrew Bevan.)
	  Fixed.

    o   nnmap, nnmark
	  A small proportion of pixels had incorrect values.
	  [These were the pixels lying on the boundary of a Dirichlet cell.]
	  Fixed. 

    o   leverage.ppm, influence.ppm, dfbetas.ppm
	  Results were incorrect for non-Poisson processes.
	  Fixed.

    o   distcdf
	  Results were incorrect in some cases
	  when W was a window and V was a point pattern.
	  Fixed.

    o   Kcross, Kdot, pcfcross, pcfdot
	  Results were incorrect in some rare cases.
	  Fixed.

    o   as.fv.kppm
	  Erroneously returned a NULL value.
	  Fixed.

    o   vcov.ppm
	  For point process models fitted with method = 'logi',
	  sometimes crashed with error "object 'fit' not found".
	  (Spotted by Ege Rubak).
	  Fixed.

    o   vcov.ppm
	  For multitype point process models, sometimes crashed
	  with error "argument 'par' is missing".
	  Fixed.

    o   plot.im
	  Crashed if some of the pixel values were infinite.
	  Fixed.

    o   owin 
	  owin(poly=..) crashed if there were NA's in the polygon coordinates.
	  Spotted by Jeff Marcus.
	  Fixed.

    o   plot.fv
	  Crashed, giving an incomprehensible error,
	  if the plot formula contained a number with a decimal point.
	  Fixed.

    o   alltypes
	  Crashed if envelopes=TRUE and global=TRUE, 
	  with error message 'csr.theo not found'.
	  Spotted by Jose M Blanco Moreno.
	  Fixed.

    o   chop.tess, rMosaicField
	  Format of result was garbled in some cases.
	  Fixed.

    o   vcov.ppm
	  Sometimes gave an irrelevant warning "parallel option not available".
	  Fixed.

                 Changes in version 1.33-0 (2013-09-05)                 

OVERVIEW

    o   We thank Kurt Hornik and Brian Ripley for advice.

    o   The package namespace has been modified.

    o   Numerous internal changes.

    o   Likelihood cross-validation for smoothing bandwidth.

    o   More flexible models of intensity in cluster/Cox processes.

    o   New generic function for smoothing.

    o   Version nickname: 'Titanic Deckchair'

NEW FUNCTIONS

    o   bw.ppl
	   Likelihood cross-validation technique 
	   for bandwidth selection in kernel smoothing.

    o   is.lppm, is.kppm, is.slrm
	   Tests whether an object is of class 'lppm', 'kppm' or 'slrm'

    o   Smooth
	   New generic function for spatial smoothing.

    o   Smooth.ppp, Smooth.fv, Smooth.msr
	   Methods for Smooth
	   (identical to smooth.ppp, smooth.fv, smooth.msr respectively)

    o   fitted.kppm
	   Method for 'fitted' for cluster/Cox models

SIGNIFICANT USER-VISIBLE CHANGES

    o   namespace
	   The namespace of the spatstat package has been changed.

    o   internal functions
	   Some undocumented internal functions are no longer visible,
	   as they are no longer exported in the namespace. These functions
	   can still be accessed using the form spatstat:::functionname.
	   Functions that are not visible are not guaranteed to exist 
	   or to remain the same in future. 

    o   methods
	   For some generic functions defined in the spatstat package,
	   it is possible that R may fail to find one of the methods
	   for the generic. This is a temporary problem due to a restriction
	   on the size of the namespace in R 3.0.1. It will be fixed in 
	   future versions of R and spatstat. It only applies to methods
	   for a generic which is a spatstat function (such as nndist)
	   and does not apply to methods for generics defined elsewhere
	   (such as density). In the meantime, if this problem should occur, 
	   it can be avoided by calling the method explicitly, in the form
	   spatstat:::genericname.classname.

    o   speed
	   The package should run slightly faster overall, due to the
	   improvement of the namespace, and changes to internal code.

    o   envelope
	   New argument 'envir.simul' determines the environment
	   in which to evaluate the expression 'simulate'.

    o   kppm
	   More flexible models of the intensity, and greater control over the
	   intensity fitting procedure, are now possible using the arguments
	   'covfunargs', 'use.gam', 'nd', 'eps' passed to ppm.
	   Also the argument 'X' may now be a quadrature scheme.

    o   distcdf
	   Arguments W and V can now be point patterns.

    o   Kest
	   New option: correction = "good" 
	   selects the best edge correction that can be computed in reasonable time.

    o   bw.diggle
	   Accelerated.

    o   predict.ppm
	   Calculation of standard error has been accelerated.

    o   smooth.ppp, smooth.fv, smooth.msr
	   These functions will soon be 'Deprecated' in favour of
	   the methods Smooth.ppp, Smooth.fv, Smooth.msr respectively.

    o   stratrand, overlap.owin, update.slrm, edge.Trans, edge.Ripley
	   These already-existing functions are now documented.

BUG FIXES

    o   kppm, matclust.estpcf, pcfmodel
	   The pair correlation function of the Matern Cluster Process
	   was evaluated incorrectly at distances close to 0.
	   This could have affected the fitted parameters 
	   in matclust.estpcf() or kppm(clusters="MatClust").
	   Fixed.

    o   anova.ppm
	   Would cause an error in future versions of R
	   when 'anova.glm' is removed from the namespace.
	   Fixed.

                 Changes in version 1.32-0 (2013-08-13)                 

OVERVIEW

    o   We thank Ege Rubak for major contributions.

    o   Thanks also to Patrick Donnelly, Andrew Hardegen,
	    Tom Lawrence, Robin Milne, Gopalan Nair and Sean O'Riordan.

    o   New 'logistic likelihood' method for fitting Gibbs models.

    o   Substantial acceleration of several functions
	    including profile maximum pseudolikelihood
	    and variance calculations for Gibbs models.

    o   Nearest neighbours for point patterns in 3D

    o   Nearest-neighbour interpolation in 2D

    o   New 'progress plots' 

    o   Hard core thresholds can be estimated automatically.

    o   More support for colour maps

    o   More support for 'fv' objects

    o   Spatstat now has version nicknames.
	  The current version is "Logistical Nightmare".

    o   Minor improvements and bug fixes.

NEW FUNCTIONS

    o   nncross.pp3
	  Method for 'nncross' for point patterns in 3D

    o   nnmark
	  Mark of nearest neighbour - can be used for interpolation

    o   dclf.progress, mad.progress
	  Progress plots (envelope representations) for the DCLF and MAD tests.

    o   deriv.fv
	  Numerical differentiation for 'fv' objects.

    o   interp.colourmap
	  Smooth interpolation of colour map objects - makes it easy to build
	  colour maps with gradual changes in colour

    o   tweak.colourmap
	  Change individual colour values in a colour map object

    o   beachcolourmap
	  Colour scheme appropriate for `altitudes' (signed numerical values)

    o   as.fv
	  Convert various kinds of data to an 'fv' object

    o   quadscheme.logi
	  Generates quadrature schemes for the logistic method of ppm.

    o   beginner
	  Introduction for beginners.

SIGNIFICANT USER-VISIBLE CHANGES

    o   ppm
	  New option: method = "logi" 
	  Fits a Gibbs model by the newly developed 'logistic likelihood' method
	  which is often faster and more accurate than maximum pseudolikelihood.
	  Code contributed by Ege Rubak.

    o   profilepl
	  Greatly accelerated, especially for area-interaction models.

    o   vcov.ppm
	  Greatly accelerated for higher-order interaction models.

    o   smooth.ppp
	  Now handles bandwidths equal to zero (by invoking 'nnmark')

    o   Hardcore, StraussHard
	  The hard core distance 'hc' can now be omitted; 
	  it will be estimated from data.

    o   plot.ppp
	  Now behaves differently if there are multiple columns of marks.
	  Each column of marks is plotted, in a series of separate plots
	  arranged side-by-side.

    o   plot.im
	  Argument 'col' can now be a function

    o   lohboot
	  Now computes confidence intervals for L-functions as well
	  (fun="Lest" or fun="Linhom")

    o   dclf.test, mad.test
	  The argument X can now be an object produced by a previous call
	  to dclf.test or mad.

    o   plot.fv
	  Labelling of plots has been improved in some cases.

    o   smooth.fv
	  Further options added.

    o   density.ppp
	  The argument 'weights' can now be a matrix.

    o   smooth.ppp
	  Accelerated, when there are several columns of marks.

    o   density.ppp
	  Accelerated slightly.

    o   simulate.ppm, simulate.kppm
	  The total computation time is also returned.

    o   simulate.kppm
	  Now catches errors (such as 'insufficient memory').

    o   latest.news, licence.polygons
	  Can now be executed by typing the name of the function without parentheses.

    o   latest.news
	  The text is now displayed one page at a time.

BUG FIXES

    o   Hest, Gfox, Jfox
	  The 'raw' estimate was not computed correctly (or at least 
	  it was not the raw estimate described in the help files).
	  Spotted by Tom Lawrence.
	  Fixed.

    o   edges2vees
	  Format of result was incorrect if there were fewer than 3 edges.
	  Fixed.

    o   Jfox
	  The theoretical value (corresponding to independence between X and Y)
	  was erroneously given as 0 instead of 1.
	  Spotted by Patrick Donnelly.
	  Fixed.

    o   ppm, quadscheme, default.dummy 
	  If the grid spacing parameter 'eps' was specified,
	  the quadrature scheme was sometimes slightly incorrect
	  (missing a few dummy points near the window boundary).
	  Fixed.

    o   print.timed
	  Matrices were printed incorrectly.
	  Fixed.

                 Changes in version 1.31-3 (2013-05-27)                 

OVERVIEW

    o   spatstat now 'Suggests' the package 'tensor'

    o   Code slightly accelerated.

    o   More support for pooling of envelopes.

    o   Bug fixes.

NEW FUNCTIONS

    o   nnmap
	  Given a point pattern, finds the k-th nearest point in the pattern
	  from each pixel in a raster.

    o   coef.fii, coef.summary.fii
	  Extract the interaction coefficients of a fitted interpoint interaction

    o   edges2vees
	  Low-level function for finding triples in a graph.

SIGNIFICANT USER-VISIBLE CHANGES

    o   predict.ppm
	  New argument 'correction' allows choice of edge correction
	  when calculating the conditional intensity.

    o   pool.envelope
	  New arguments 'savefuns' and 'savepatterns'.

    o   pool.envelope
	  Envelopes generated with VARIANCE=TRUE can now be pooled.

    o   pool.envelope
	  The plot settings of the input data are now respected.

    o   Numerous functions have been slightly accelerated.

BUG FIXES

    o   predict.ppm
	  Calculation of the conditional intensity omitted the edge correction
	  if correction='translate' or correction='periodic'.
	  Fixed.

    o   shift.lpp, rotate.lpp, scalardilate.lpp, affine.lpp,
	   shift.linnet, rotate.linnet, scalardilate.linnet, affine.linnet
	  The enclosing window was not correctly transformed. 
	  Fixed.

    o   rHardcore, rStraussHard, rDiggleGratton, rDGS
	  The return value was invisible.
	  Fixed.

    o   ppm
	  In rare cases the results obtained with forcefit=FALSE and forcefit=TRUE
	  were different, due to numerical rounding effects.
	  Fixed.

                 Changes in version 1.31-2 (2013-04-26)                 

OVERVIEW

    o   We thank Robin Corria Anslie, Julian Gilbey, Kiran Marchikanti,
	  Ege Rubak and Thordis Linda Thorarinsdottir for contributions.

    o   spatstat now depends on R 3.0.0

    o   More support for linear networks

    o   More functionality for nearest neighbours

    o   Bug fix in fitting Geyer model

    o   Performance improvements and bug fixes

NEW FUNCTIONS

    o   affine.lpp, shift.lpp, rotate.lpp, rescale.lpp, scalardilate.lpp
	  Geometrical transformations for point patterns on a linear network

    o   affine.linnet, shift.linnet, rotate.linnet, 
	  rescale.linnet, scalardilate.linnet
	  Geometrical transformations for linear networks

    o   [.linnet
	  Subset operator for linear networks

    o   timed
	  Records the computation time taken

SIGNIFICANT USER-VISIBLE CHANGES

    o   nncross
	  nncross.ppp can now find the k-th nearest neighbours, for any k.

    o   nndist, nnwhich
	  New argument 'by' makes it possible to find nearest neighbours
	  belonging to specified subsets in a point pattern, for example,
	  the nearest neighbour of each type in a multitype point pattern.

    o   [.fv
	  Now handles the argument 'drop'.

    o   with.fv
	  Argument 'drop' replaced by new argument 'fun'
	  (with different interpretation).

    o   [.lpp
	  Subset index may now be a window (class 'owin')

    o   Kest
	  Options correction='border' and correction='none'
	  now run about 4 times faster, thanks to Julian Gilbey.

    o   density.ppp
	  Numerical underflow no longer occurs when sigma is very small
	  and 'at="points"'. A warning is no longer issued.
	  Thanks to Robin Corria Anslie.

    o   crossing.psp
	  New argument 'fatal' allows the user to handle empty intersections

    o   union.owin
	  It is now guaranteed that if A is a subset of B, then union.owin(A,B)=B.

    o   plot.colourmap
	  Now passes arguments to axis() to control the plot.
	  Appearance of plot improved.

    o   image.listof
	  Now passes arguments to plot.colourmap() if equal.ribbon=TRUE.

    o   kppm
	  Accelerated (especially for large datasets).

    o   plot.envelope
	  plot.envelope is now equivalent to plot.fv and is essentially redundant.

    o   rThomas, rMatClust, rNeymanScott
	  Improved explanations in help files.

    o   All functions
	  Many functions have been slightly accelerated.

BUG FIXES

    o   ppm
	  Results were incorrect for the Geyer saturation model
	  with a non-integer value of the saturation parameter 'sat'.
	  Spotted by Thordis Linda Thorarinsdottir.
	  Bug introduced in spatstat 1.20-0, July 2010.
	  Fixed.

    o   ppm
	  Fitting a stationary Poisson process using a nonzero value of 'rbord',
	  as in "ppm(X, rbord=R)" with R > 0, gave incorrect results.
	  Fixed.

    o   predict.slrm
	  Crashed with message 
	  'longer object length is not a multiple of shorter object length' 
	  if the original data window was not a rectangle.
	  Fixed.

    o   iplot
	  Main title was sometimes incorrect.
	  Fixed.

    o   plot.layered
	  Ignored argument 'main' in some cases.
	  Fixed.

    o   plot.listof, image.listof
	  Crashed sometimes with a message 'figure margins too large'
	  when equal.ribbon=TRUE.
	  Fixed.

    o   print.ppx
	  Crashed if the object contained local coordinates.
	  Fixed.

    o   transect.im
	  Crashed if the transect lay partially outside the image domain.
	  Fixed.

    o   rthin
	  Crashed if X was empty.
	  Fixed.

    o   max.im, min.im, range.im
	  Ignored additional arguments after the first argument.
	  Fixed.

    o   update.lppm
	  Updated object did not remember the name of the original dataset.
	  Fixed.

    o   envelope
	  Grey shading disappeared from plots of envelope objects 
	  when the envelopes were transformed using eval.fv or eval.fasp.
	  Fixed.

                 Changes in version 1.31-1 (2013-03-01)                 

OVERVIEW

    o   We thank Marcelino de la Cruz, Daniel Esser, Jason Goldstick,
	    Abdollah Jalilian, Ege Rubak and Fabrice Vinatier for contributions.

    o   Nonparametric estimation and tests for 
	    point patterns in a linear network.

    o   More support for 'layered' objects.

    o   Find clumps in a point pattern.

    o   Connected component interaction model.

    o   Improvements to interactive plots.

    o   Visual debugger for Metropolis-Hastings algorithm.

    o   Bug fix in Metropolis-Hastings simulation of Geyer process.

    o   Faster Metropolis-Hastings simulation.

    o   Faster computation of 'envelope', 'fv' and 'fasp' objects.

    o   Improvements and bug fixes.

NEW FUNCTIONS

    o   connected.ppp
	  Find clumps in a point pattern.

    o   kstest.lpp, kstest.lppm
	  The spatial Kolmogorov-Smirnov test can now be applied 
	  to point patterns on a linear network (class 'lpp') and 
	  point processes on a linear network (class 'lppm').

    o   bermantest.lpp, bermantest.lppm
	  Berman's Z1 and Z2 tests can now be applied to point patterns
	  on a linear network (class 'lpp') and point processes on a linear
	  network (class 'lppm').

    o   rhohat.lpp, rhohat.lppm
	  Nonparametric estimation of the dependence of a point pattern
	  on a spatial covariate: 'rhohat' now applies to 
	  objects of class 'lpp' and 'lppm'.

    o   intensity.lpp
	  Empirical intensity of a point pattern on a linear network.

    o   as.function.rhohat
	  Converts a 'rhohat' object to a function,
	  with extrapolation beyond the endpoints.

    o   [.layered
	  Subset operator for layered objects.

    o   shift, rotate, affine, rescale, reflect, flipxy, scalardilate
	  These geometrical transformations now work for 'layered' objects.

    o   iplot.layered
	  Interactive plotting for 'layered' objects.

    o   as.owin.layered
	  Method for as.owin for layered objects.

    o   [.owin
	  Subset operator for windows, equivalent to intersect.owin.

    o   rcellnumber
	  Generates random integers for the Baddeley-Silverman counterexample.

    o   is.lpp
	  Tests whether an object is a point pattern on a linear network.

    o   is.stationary.lppm, is.poisson.lppm
	  New methods for is.stationary and is.poisson for class 'lppm'

    o   sessionLibs
	  Print library names and version numbers (for use in Sweave scripts)

SIGNIFICANT USER-VISIBLE CHANGES

    o   iplot
	  iplot is now generic, with methods for 'ppp', 'layered' and 'default'.
	  iplot methods now support zoom and pan navigation.

    o   rmh.default
	  New argument 'snoop' allows the user to activate a visual debugger
	  for the Metropolis-Hastings algorithm.

    o   connected
	  connected() is now generic, with methods for 'im', 'owin' and 'ppp'.

    o   alltypes
	  Now works for lpp objects 

    o   rlabel
	  Now works for lpp, pp3, ppx objects

    o   plot.kstest
	  Can now perform P-P and Q-Q plots as well.

    o   plot.fasp
	  New argument 'samey' controls whether all panels 
	  have the same y limits.

    o   plot.fasp
	  Changed default value of 'samex'.

    o   Objects of class 'envelope', 'fv' and 'fasp' 
	  Reduced computation time and storage required for these objects.

    o   pcfmodel.kppm
	  Improved calculation.

    o   plot.fv
	  Improved collision-avoidance algorithm
	  (for avoiding overlaps between curves and legend)

    o   ppm
	  Improved error handling

    o   envelope
	  All methods for 'envelope' now handle fun=NULL   

    o   setminus.owin
	  Better handling of the case where both arguments are rectangles.

    o   rmh
	  Simulation has been further accelerated.

    o   lppm
	  Accelerated.

    o   vcov.ppm
	  Accelerated.

    o   marktable
	  Accelerated.

    o   Triplets() interaction
	  Accelerated.

    o   alltypes
	  Accelerated when envelope=TRUE.

BUG FIXES

    o   rmh
	  Simulation of the Geyer saturation process was incorrect.
	  [Bug introduced in previous version, spatstat 1.31-0.]
	  Fixed.

    o   rmh
	  Simulation of the Geyer saturation process was 
	  incorrectly initialised, so that the results of a short run 
	  (i.e. small value of 'nrep') were incorrect, 
	  while long runs were correct.
	  [Bug introduced in spatstat 1.17-0, october 2009.]
	  Fixed.

    o   ppm 
	  Objects fitted with use.gam=TRUE caused fatal errors in
	  various functions including print, summary, vcov and model.frame.
	  Spotted by Jason Goldstick.
	  Fixed.

    o   lpp, runiflpp, rpoislpp
	  Empty point patterns caused an error.
	  Fixed.

    o   rmh.default
	  Crashed for hybrid models, with message 
	  'Attempt to apply non-function'.
	  Spotted by Ege Rubak.
	  Fixed.

    o   relrisk
	  Crashed when 'at="points"' for a multitype pattern
	  with more than 2 types.
	  Spotted by Marcelino de la Cruz.
	  Fixed.

    o   erosion.owin, dilation.psp, border
	  Ignored the arguments "..." in some cases
	  (namely when the window was polygonal and 'gpclib' was disabled).
	  Fixed.

    o   rsyst, rcell
	  Did not correctly handle the argument 'dx'.
	  Spotted by Fabrice Vinatier.
	  Fixed.

    o   correction="trans"
	  Various functions such as Kest 
	  no longer recognised 'correction = "trans"'.
	  Fixed.

    o   istat
	  Crashed with an error message about envelopes. 
	  Fixed.

    o   summary.ppm, print.ppm
	  p-values which were exactly equal to zero were reported as NA.
	  Fixed.

    o   [.im
	  Crashed if the intersection consisted of
	  a single row or column of pixels.
	  Fixed.

    o   plot.im
	  Sometimes incorrectly displayed an image consisting of 
	  a single row or column of pixels.
	  Fixed.

    o   plot.layered
	  The plot region was determined by the first layer,
	  so that objects in subsequent layers could sometimes 
	  fall outside the plot region.
	  Fixed.

    o   transect.im
	  If the arguments 'from' and 'to' were numeric vectors of length 2,
	  the result was garbled.
	  Fixed.   

    o   Inhomogeneous K functions and pair correlation functions
	  [Kinhom, pcfinhom, Kcross.inhom, Kdot.inhom, pcfcross.inhom, etc.]
	  These functions reported an error 'lambda is not a vector'
	  if the intensity argument lambda was computed using density(, at="points").
	  Fixed.

    o   rlabel
	  Did not accept a point pattern with a hyperframe of marks.
	  Fixed.

    o   alltypes
	  Crashed when envelope=TRUE if the summary function 'fun'
	  did not have default values for the marks i and j.
	  Fixed.

    o   Kres, Gres, psst, psstA
	  Ignored the unit of length.
	  Fixed.

                 Changes in version 1.31-0 (2013-01-17)                 

OVERVIEW

    o   We thank Frederic Lavancier and Ege Rubak for contributions.

    o   Major bug fix in simulation of area-interaction process.

    o   Metropolis-Hastings simulations accelerated.

    o   Rounding of spatial coordinates

    o   clmfires dataset corrected.

    o   Bug fixes and minor improvements.

NEW FUNCTIONS

    o   round.ppp
	  Round the spatial coordinates of a point pattern 
	  to a specified number of decimal places.

    o   rounding
	  Determine whether a dataset has been rounded.

SIGNIFICANT USER-VISIBLE CHANGES

    o   rmh
	  Simulation of the following models has been accelerated:
	  areaint, dgs, diggra, fiksel, geyer, hardcore, lennard, multihard,
	  strauss, straush, straussm, strausshm.

    o   rmh
	  The transition history of the simulation (which is saved if 'track=TRUE')
	  now also contains the value of the Hastings ratio for each proposal.

    o   clmfires
	  The clmfires dataset has been modified to remove errors and inconsistencies.

    o   plot.linim
	  Appearance of the plot has been improved, when style='width'.

    o   summary.ppm
	  Now reports whether the spatial coordinates have been rounded.

    o   dclf.test, mad.test
	  The range of distance values ('rinterval') used in the test
	  is now printed in the test output, and is saved as an attribute.

BUG FIXES

    o   rmh
	  Simulation of the Area-Interaction model was completely incorrect.
	  Spotted by Frederic Lavancier.
	  The bug was introduced in spatstat version 1.23-6 or later.
	  Fixed.

    o   dclf.test
	  The test statistic was incorrectly scaled (by a few percent).
	  This did not affect the p-value of the test.
	  Fixed.

    o   ppx
	  If argument 'coord.type' was missing, various errors occurred:
	  a crash may have occurred, or the results may have depended
	  on the storage type of the data. 
	  Spotted by Ege Rubak.
	  Fixed. 

    o   plot.ppx
	  Crashed for 1-dimensional point patterns.
	  Spotted by Ege Rubak.
	  Fixed.

                 Changes in version 1.30-0 (2012-12-23)                 

OVERVIEW 

    o   We thank Jorge Mateu, Andrew Bevan, Olivier Flores, Marie-Colette van Lieshout, Nicolas Picard and Ege Rubak for contributions.

    o   The spatstat manual now exceeds 1000 pages.

    o   Hybrids of point process models.

    o   Five new datasets

    o   Second order composite likelihood method for kppm.

    o   Inhomogeneous F, G and J functions.

    o   Delaunay graph distance

    o   Fixed serious bug in 'lppm' for marked patterns.

    o   bug fix in some calculations for Geyer model

    o   Improvements to linear networks code

    o   Pixel images can now be displayed with a logarithmic colour map.

    o   spatstat now formally 'Depends' on the R core package 'grDevices'

    o   miscellaneous improvements and bug fixes

NEW DATASETS

    o   clmfires
	  Forest fires in Castilla-La Mancha

    o   gordon
	  People sitting on the grass in Gordon Square, London

    o   hyytiala 
	  Mixed forest in Hyytiala, Finland (marked by species)

    o   paracou
	  Kimboto trees in Paracou, French Guiana (marked as adult/juvenile)

    o   waka
	  Trees in Waka national park (marked with diameters)

NEW FUNCTIONS

    o   Hybrid
	  The hybrid of several point process interactions
	  [Joint research with Jorge Mateu and Andrew Bevan]

    o   is.hybrid
	  Recognise a hybrid interaction or hybrid point process model.

    o   Finhom, Ginhom, Jinhom
	  Inhomogeneous versions of the F, G and J functions
	  [Thanks to Marie-Colette van Lieshout]

    o   delaunay.distance
	  Graph distance in the Delaunay triangulation.

    o   distcdf
	  Cumulative distribution function of the distance between
	  two independent random points in a given window.

    o   bw.frac
	  Bandwidth selection based on window geometry

    o   shortside.owin, sidelengths.owin
	  Side lengths of (enclosing rectangle of) a window

SIGNIFICANT USER-VISIBLE CHANGES

    o   ppm
	  Can now fit models with 'hybrid' interactions
	  [Joint research with Jorge Mateu and Andrew Bevan]

    o   kppm
	  Now has the option of fitting models using Guan's (2006)
	  second order composite likelihood.

    o   envelope.lpp
	  Now handles multitype point patterns.

    o   envelope.envelope
	  New argument 'transform' allows the user to apply a transformation
	  to previously-computed summary functions.

    o   runifpointOnLines, rpoisppOnLines, runiflpp, rpoislpp
	  Can now generate multitype point patterns.

    o   rmhmodel, rmh, simulate.ppm
	  Now handle point process models with 'hybrid' interactions.

    o   kppm
	  Accelerated, and more reliable, due to better choice of starting values 
	  in the optimisation procedure.

    o   kppm
	  The internal format of kppm objects has changed.

    o   minimum contrast estimation
	  Error messages from the optimising function 'optim' are now trapped
	  and handled.

    o   rhohat
	  This command is now generic, with methods for ppp, quad, and ppm.

    o   raster.x, raster.y, raster.xy
	  These functions have a new argument 'drop'

    o   summary.ppm
	  Improved behaviour when the model covariates are a data frame.

    o   progressreport
	  Output improved.

    o   second order summary functions
	  (Kest, Lest, Kinhom, pcf.ppp, Kdot, Kcross, Ldot etc etc)
	  These functions now accept correction="translation" as an 
	  alternative to correction = "translate", for consistency.

    o   plot.im
	  New argument 'log' allows colour map to be equally spaced on a log scale.

    o   as.owin.ppm, as.owin.kppm
	  New argument 'from' allows the user to extract the spatial window
	  of the point data (from="points") or the covariate images (from="covariates")

    o   dclf.test, mad.test
	  The rule for handling tied values of the test statistic has been changed.
	  The tied values are now randomly ordered to obtain a randomised integer rank.

    o   with.fv
	  New argument 'enclos' allows evaluation in other environments

BUG FIXES

    o   lppm
	  For multitype patterns, the fitted model was completely incorrect
	  due to an error in constructing the quadrature scheme.
	  Fixed.

    o   Geyer
	  For point process models with the 'Geyer' interaction, 
	  vcov.ppm() and suffstat() sometimes gave incorrect answers.
	  [Spotted by Ege Rubak.]
	  Fixed.

    o   as.im.im
	  Did not correctly handle factor-valued images
	  if one of the arguments 'dimyx', 'eps', 'xy' was given.
	  Fixed.

    o   envelope.lppm
	  Crashed if the model was multitype.
	  Fixed.

    o   lpp
	  Did not handle empty patterns.
	  Fixed.

    o   density.ppp
	  If 'sigma' was a bandwidth selection function such as bw.scott()
	  which returned a numeric vector of length 2, a warning message was issued, 
	  and the smoothing bandwidth was erroneously taken to be
	  the first element of the vector.
	  Fixed.

    o   Fest, Jcross, Jdot, Jmulti
	  If these functions were computed using correction = 'rs', 
	  plotting them would sometimes give an error,      
	  with the message "no finite x/y limits".
	  Fixed.

    o   pcfmodel.kppm
	  For models with clusters="VarGamma"
	  the value of the pcf at distance r=0 was given as NaN. 
	  Fixed.

    o   vcov.ppm
	  Result was incorrect in rare cases, due to numerical rounding effects.
	  Fixed.

    o   rLGCP, simulate.kppm
	  For models fitted to point patterns in an irregular window, 
	  simulation sometimes failed, with a message that the image 'mu' 
	  did not cover the simulation window.
	  (Spotted by George Limitsios.)
	  Fixed.

    o   rLGCP, simulate.kppm
	  Crashed sometimes with an error about unequal x and y steps
	  (from 'GaussRF').
	  Fixed.

                 Changes in version 1.29-0 (2012-10-14)                 

OVERVIEW 

    o   We thank Colin Beale, Li Haitao, Frederic Lavancier, Erika Mudrak and Ege Rubak for contributions.

    o   random sequential packing

    o   Allard-Fraley estimator

    o   method for pooling several quadrat tests

    o   better control over dummy points in ppm

    o   more support for data on a linear network

    o   nearest neighbour map 

    o   changes to subsetting of images

    o   improvements and bug fixes 

NEW FUNCTIONS

    o   clusterset
	  Allard-Fraley estimator of high-density features in a point pattern

    o   pool.quadrattest
	  Pool several quadrat tests

    o   nnfun
	  Nearest-neighbour map of a point pattern or a line segment pattern

    o   as.ppm
	  Converts various kinds of objects to ppm

    o   crossdist.lpp
	  Shortest-path distances between pairs of points in a linear network

    o   nobs.lppm
	  Method for 'nobs' for lppm objects.

    o   as.linim
	  Converts various kinds of objects to 'linim'

    o   model.images.slrm
	  Method for model.images for slrm objects

    o   rotate.im
	  Rotate a pixel image

SIGNIFICANT USER-VISIBLE CHANGES

    o   "[.im" and "[<-.im"
	  New argument 'j' allows any type of matrix indexing to be used.

    o   "[.im"
	  Default behaviour changed in the case of a rectangular subset.
	  New argument 'rescue' can be set to TRUE to reinstate previous behaviour.

    o   rSSI
	  Performs 'Random Sequential Packing' if n=Inf.

    o   ppm
	  New argument 'eps' determines the spacing between dummy points.
	  (also works for related functions quadscheme, default.dummy, ...)

    o   fitted.ppm, predict.ppm
	  Argument 'new.coef' specifies a vector of parameter values
	  to replace the fitted coefficients of the model.

    o   lppm
	  Stepwise model selection using step() now works for lppm objects.

    o   vcov.slrm
	  Can now calculate correlation matrix or Fisher information matrix
	  as well as variance-covariance matrix.

    o   eval.fv
	  Improved behaviour when plotted.

    o   "[.fv"
	  Improved behaviour when plotted.

    o   lohboot
	  When the result is plotted, the confidence limits are now shaded.

    o   lohboot
	  New argument 'global' allows global (simultaneous) confidence bands
	  instead of pointwise confidence intervals.

    o   vcov.ppm
	  Accelerated by 30% in some cases.

    o   quadrat.test.splitppp
	  The result is now a single object of class 'quadrattest'

    o   progressreport
	  Improved output (also affects many functions which print progress reports)

    o   Full redwood data (redwoodfull)
	  Plot function redwoodfull.extra$plotit has been slightly improved.

    o   nncross
	  This function is now generic, with methods for 'ppp' and 'default'.

    o   distfun
	  The internal format of objects of class 'distfun' has been changed.

    o   duplicated.ppp, unique.ppp   
	  New argument 'rule' allows behaviour to be consistent with package 'deldir'

BUG FIXES

    o   bdist.tiles
	  Values were incorrect in some cases due to numerical error.
	  (Spotted by Erika Mudrak.)
	  Fixed.

    o   vcov.ppm, suffstat
	  These functions sometimes gave incorrect values 
	  for marked point process models.
	  Fixed.

    o   simulate.ppm, predict.ppm
	  Did not correctly handle the 'window' argument. (Spotted by Li Haitao).
	  Fixed.

    o   smooth.ppp, markmean
	  If sigma was very small, strange values were produced, due to
	  numerical underflow. (Spotted by Colin Beale).
	  Fixed.

    o   MultiHard, MultiStrauss, MultiStraussHard
	  Crashed if the data point pattern was empty.
	  (Spotted by Ege Rubak).
	  Fixed.

    o   vcov.ppm
	  Crashed sporadically, with multitype interactions.
	  (Spotted by Ege Rubak).
	  Fixed.

    o   rStrauss, rHardcore, rStraussHard, rDiggleGratton, rDGS
	  If the simulated pattern was empty, these functions would either
	  crash, or return a pattern containing 1 point.
	  (Spotted by Frederic Lavancier).
	  Fixed.

    o   model.matrix.slrm
	  Crashed if the model was fitted using split pixels.
	  Fixed.

    o   residuals.ppm, diagnose.ppm
	  Did not always correctly handle models that included offset terms.
	  Fixed.

    o   project.ppm
	  When a model was projected by project.ppm or by ppm(project=TRUE),
	  the edge corrections used the projected models were sometimes different
	  from the edge corrections in the original model, so that the 
	  projected and unprojected models were not comparable.
	  Fixed.

    o   plot.listof, plot.splitppp
	  Crashed sometimes due to a scoping problem.
	  Fixed.

    o   dclf.test, mad.test
	  Crashed if any of the function values were infinite or NaN.
	  Fixed.

    o   psstA
	  Default plot did not show the horizontal line at y=0
	  corresponding to a perfect fit.
	  Fixed.

    o   vcov.ppm
	  names attribute was spelt incorrectly in some cases.
	  Fixed.

                 Changes in version 1.28-2 (2012-08-23)                 

OVERVIEW 

    o   We thank Thomas Bendtsen, Ya-Mei Chang, Daniel Esser, 
	    Robert John-Chandran, Ege Rubak and Yong Song for contributions.

    o   New code for Partial Residual Plots and Added Variable Plots.

    o   maximum profile pseudolikelihood computations vastly accelerated.

    o   New dataset: cells in gastric mucosa

    o   now possible to capture every k-th state of Metropolis-Hastings algorithm.

    o   size of 'ppm' objects reduced.

    o   scope of 'intensity.ppm' extended.

    o   quadrat.test can now perform Monte Carlo tests and one/two-sided tests

    o   improvements to 'plot.fv'

    o   improvement to 'rescale'

    o   some datasets reorganised.

    o   numerous bug fixes

NEW DATASET

    o   mucosa
	  Cells in gastric mucosa
	  Kindly contributed by Dr Thomas Bendtsen

NEW FUNCTIONS

    o   parres
	  Partial residual plots for spatial point process models.
	  A diagnostic for the form of a covariate effect.

    o   addvar
	  Added variable plots for spatial point process models.
	  A diagnostic for the existence of a covariate effect.

SIGNIFICANT USER-VISIBLE CHANGES

    o   profilepl
	 Accelerated (typically by a factor of 5).

    o   rmh, rmhcontrol
	 It is now possible to save every k-th iteration of the Metropolis-Hastings
	 algorithm. The arguments 'nsave' and 'nburn' may be given to rmh
	 or to rmhcontrol. They specify that the point pattern will be saved
	 every 'nsave' iterations, after an initial burn-in of 'nburn' iterations.

    o   simulate.ppm
	 New argument 'singlerun' determines whether the simulated patterns
	 are generated using independent runs of the Metropolis-Hastings algorithm
	 or are obtained by performing one long run of the algorithm and saving
	 every k-th iteration.

    o   exactMPLEstrauss
	 New argument 'project' determines whether the parameter gamma
	 is constrained to lie in [0,1].

    o   intensity.ppm
	 Now works for stationary point process models with the interactions
	 DiggleGratton, DiggleGatesStibbard, Fiksel, PairPiece and Softcore.

    o   plot.fv
	 Improved algorithm for avoiding collisions between graphics and legend.

    o   plot.fv
	 New argument 'log' allows plotting on logarithmic axes.

    o   envelope
	 Can now calculate an estimate of the true significance level
	 of the "wrong" test (which declares the observed summary function
	 to be significant if it lies outside the pointwise critical boundary
	 anywhere). Controlled by new argument 'do.pwrong'.

    o   quadrat.test
	 New argument 'alternative' allows choice of alternative hypothesis
	 and returns one-sided or two-sided p-values as appropriate.

    o   quadrat.test
	 Can now perform Monte Carlo test as well 
	 (for use in small samples where the chi^2 approximation is inaccurate)

    o   Softcore
	 Improved numerical stability.
	 New argument 'sigma0' for manual control over rescaling.

    o   rescale
	 If scale argument 's' is missing, then the data are rescaled
	 to native units. For example if the current unit is 0.1 metres, 
	 coordinates will be re-expressed in metres.

    o   psst
	 Extra argument 'verbose=TRUE'

    o   is.subset.owin
	 Accelerated for polygonal windows

    o   rmh.default
	 'track' is no longer a formal argument of rmh.default; it is now a 
	 parameter of rmhcontrol. However there is no change in usage: 
	 the argument 'track' can still be given to rmh.default.

    o   clf.test
	 Has been renamed 'dclf.test' 
	 to give proper attribution to Peter Diggle.

    o   betacells
	 This dataset has been restructured. The vector of cell profile areas,
	 formerly given by betacells.extra$area, has now been included
	 as a column of marks in the point pattern 'betacells'.

    o   ants
	 The function ants.extra$plot() has been renamed plotit() 
	 for conformity with other datasets.

    o   redwoodfull
	 The function redwoodfull.extra$plot() has been renamed plotit() 
	 for conformity with other datasets.

    o   nbfires
	 For conformity with other datasets, there is now an object nbfires.extra

BUG FIXES

    o   ripras
	 Expansion factor was incorrect in the rectangular case.
	 Fixed.

    o   Triplets
	 Crashed sometimes with error "dim(X) must have positive length".
	 Fixed.

    o   affine.im
	 Crashed in the case of a diagonal transformation matrix!
	 Spotted by Ege Rubak.
	 Fixed.

    o   envelope.envelope
	 Ignored the argument 'global'.
	 Fixed.

    o   MultiStraussHard
	 The printed output showed the hardcore radii as NULL.
	 Spotted by Ege Rubak.
	 Fixed.

    o   "[.psp"
	 Crashed if the data were generated by rpoisline().
	 Spotted by Marcelino de la Cruz.
	 Fixed.

    o   plot.linim
	 If style="colour", the main title was always "x".
	 Fixed.

    o   plot.ppx
	 Setting add=TRUE did not prevent the domain being plotted.
	 Fixed.

    o   rmh
	 Crashed if x.start was an empty point pattern.
	 Spotted by Ege Rubak.
	 Fixed.

    o   as.ppp.data.frame
	 Crashed if any points lay outside the window.
	 Spotted by Ege Rubak.
	 Fixed.

    o   Ripley isotropic edge correction
	 Divide-by-zero error in rare cases.
	 Spotted by Daniel Esser.
	 Fixed.

    o   summary functions
	 For many of the summary functions (e.g. Kest, pcf),
	 the result of saving the object to disc was an enormous file.
	 Spotted by Robert John-Chandran.
	 Fixed.

    o   pcf.fv
	 Default plot was wrongly coloured.
	 Fixed.

                 Changes in version 1.28-1 (2012-06-29)                 

OVERVIEW 

    o   We thank Ege Rubak, Gopal Nair, Jens Oehlschlaegel and Mike Zamboni
	    for contributions.

    o   New approximation to the intensity of a fitted Gibbs model.

    o   Minor improvements and bug fixes

    o   spatstat now 'Suggests' the package 'gsl'

NEW FUNCTIONS

    o   intensity, intensity.ppp, intensity.ppm
	  Calculate the intensity of a dataset or fitted model.
	  Includes new approximation to the intensity of a fitted Gibbs model

    o   LambertW
	  Lambert's W-function

SIGNIFICANT USER-VISIBLE CHANGES

    o   envelope
	 Improved plot labels for envelopes that were generated using
	 the 'transform' argument.

    o   plot.fv
	 Improved algorithm for collision detection.

    o   plot.im
	 Now returns the colour map used.

    o   plot.listof, plot.splitppp
	 Slight change to handling of plot.begin and plot.end

    o   square
	 Now accepts vectors of length 2

    o   plot.fii
	 Increased resolution of the plot obtained from plot(fitin(ppm(...))) 

    o   image.listof
	 If equal.ribbon=TRUE, the colour ribbon will no longer be 
	 displayed repeatedly for each panel, 
	 but will now be plotted only once, at the right hand side of the plot array.

BUG FIXES

    o   vcov.ppm
	 Results were sometimes incorrect for a Gibbs model with non-trivial trend.
	 Spotted by Ege Rubak.
	 Fixed.

    o   nncross
	 In rare cases the results could be slightly incorrect.
	 Spotted by Jens Oehlschlaegel.
	 Fixed.

    o   plot.fv
	 When add=TRUE, the x limits were sometimes truncated.
	 Spotted by Mike Zamboni.
	 Fixed.

    o   plot.im
	 Labels for the tick marks on the colour ribbon
	 were sometimes ridiculous, e.g. "2.00000001".
	 Fixed.

                 Changes in version 1.28-0 (2012-06-11)                 

OVERVIEW 

    o   We thank Farzaneh Safavimanesh, Andrew Hardegen and Tom Lawrence 
	    for contributions.

    o   Improvements to 3D summary functions.

    o   A multidimensional point pattern (ppx) can now have 'local' coordinates
	  as well as spatial and temporal coordinates and marks.

    o   Changed format for point patterns on a linear network (lpp).
	  Changes are backward compatible. Many computations run faster.

    o   More support for fitted cluster models (kppm).

    o   split method for multidimensional point patterns (ppx)
	  and point patterns on a linear network (lpp).

    o   Fixed bug causing errors in plot.im

    o   Miscellaneous improvements and bug fixes

NEW FUNCTIONS

    o   exactMPLEstrauss
	  Fits the stationary Strauss point process model
	  using an exact maximum pseudolikelihood technique.
	  This is mainly intended for technical investigation of algorithms.

    o   split.ppx
	  Method for 'split' for multidimensional point patterns (class 'ppx').
	  This also works for point patterns on a linear network (class 'lpp').

    o   model.images
	  This function is now generic, with methods for classes ppm, kppm, lppm

    o   model.frame, model.matrix
	  These generic functions now have methods for classes kppm, lppm

    o   as.owin.kppm, as.owin.lppm
	  New methods for 'as.owin' for objects of class kppm, lppm

    o   as.linnet.lppm
	  Extracts the linear network in which a point process model was fitted.

SIGNIFICANT USER-VISIBLE CHANGES

    o   class 'ppx'
	  An object of class 'ppx' may now include 'local' coordinates 
	  as well as 'spatial' and 'temporal' coordinates, and marks.

    o   ppx
	  Arguments have changed.

    o   class 'lpp'
	  The internal format of lpp objects has been extended
	  (but is backward-compatible). Many computations run faster.
	  To convert an object to the new format: X <- lpp(as.ppp(X), as.linnet(X)).

    o   F3est
	  Calculation of theoretical Poisson curve ('theo') has changed,
	  and is now controlled by the argument 'sphere'.

    o   rmh, rmhstart
	  The initial state ('start') can now be missing or null.

    o   im, as.im
	  The pixel coordinates in an image object are now generated
	  more accurately. This avoids a numerical error in plot.im.

    o   eval.fv, eval.fasp
	  Evaluation is now applied only to columns that contain
	  values of the function itself (rather than values of the
	  derivative, hazard rate, etc). This is controlled by the
	  new argument 'dotonly'.

    o   spatstat.options
	  New option 'nvoxel'

    o   quad.ppm
	  Now accepts kppm objects.

    o   str
	  This generic function (for inspecting the internal structure of an object)
	  now produces sensible output for objects of class 'hyperframe', 'ppx', 'lpp'

    o   ppx, coords.ppx, coords<-.ppx
	  The arguments to these functions have changed.

    o   lgcp.estK, Kmodel
	  Computation can be greatly accelerated 
	  by setting spatstat.options(fastK.lgcp=TRUE).

    o   G3est
	  Computation accelerated.

    o   envelope
	  Computation slightly accelerated.

    o   spatstat.options
	  New option 'fastK.lgcp' 

BUG FIXES

    o   nndist.psp
	  Caused an error if length(k) > 1.
	  Fixed.

    o   plot.im
	  Sometimes reported an error 
	  "useRaster=TRUE can only be used with a regular grid."
	  This was due to numerical rounding effects on the coordinates
	  of a pixel image. 
	  Fixed.

    o   plot.fv
	  If a formula was used to specify the plot,
	  the names of variables in the formula were sometimes
	  incorrectly matched to *functions*.
	  Spotted by Farzaneh Safavimanesh.
	  Fixed.

    o   F3est
	  Took a very long time if the containing box was very flat,
	  due to the default value of 'vside'.
	  Fixed.

    o   rmh, rmhmodel
	  An erroneous warning about 'outdated format of rmhmodel object' 
	  sometimes occurred.
	  Fixed.

    o   marks<-.ppx
	  Names of result were incorrect. Fixed.

    o   hyperframe class
	  Various minor bug fixes.

                 Changes in version 1.27-0 (2012-05-16)                 

OVERVIEW 

    o   Variance estimates are now available for all Gibbs point process models.

    o   Cressie-Loosmore-Ford test implemented

    o   plot.fv now avoids collisions between the legend and the graphics.

    o   Extension to predict.ppm

    o   Improvements to envelopes and multitype summary functions. 

    o   Line transects of a pixel image.

    o   Changes to defaults in Metropolis-Hastings simulations.

    o   More geometrical operations

    o   Bug fixes.

    o   We thank Aruna Jammalamadaka for contributions.

NEW FUNCTIONS

    o   clf.test
	  Perform the Cressie (1991)/ Loosmore and Ford (2006) test of CSR 
	  (or another model)

    o   mad.test
	  Perform the Maximum Absolute Deviation test of CSR (or another model).

    o   convolve.im
	  Compute convolution of pixel images.

    o   Kmulti.inhom
	  Counterpart of 'Kmulti' for spatially-varying intensity.

    o   rmhexpand
	  Specify a simulation window, or a rule for expanding the
	  simulation window, in Metropolis-Hastings simulation (rmh)

    o   transect.im
	  Extract pixel values along a line transect.

    o   affine.im
	  Apply an affine transformation to a pixel image.

    o   scalardilate
	  Perform scalar dilation of a geometrical object 
	  relative to a specified origin.

    o   reflect
	  Reflect a geometrical object through the origin.

    o   "[.lpp", "[.ppx"
	  Subset operators for the classes "lpp" (point pattern on 
	  linear network) and "ppx" (multidimensional space-time
	  point pattern).

    o   is.rectangle, is.polygonal, is.mask
	  Determine whether a window w is a rectangle, a domain with polygonal 
	  boundaries, or a binary pixel mask.

    o   has.offset
	  Determines whether a fitted model object (of any kind)
	  has an offset.

SIGNIFICANT USER-VISIBLE CHANGES

    o   predict.ppm
	  This function can now calculate the conditional intensity of a model
	  relative to any point pattern X (not just the original data pattern).

    o   vcov.ppm
	  This function now handles all Gibbs point process models.

    o   plot.fv
	  Collisions between the legend box and the graphics are now detected
	  and avoided. 

    o   rmh.ppm, rmh.default, simulate.ppm, qqplot.ppm, envelope.ppm
	  These functions now have slightly different default behaviour
	  because of changes to the handling of arguments to 'rmhcontrol'.

    o   rmhcontrol
	  The default value of the parameters 'periodic' and 'expand'
	  has changed.

    o   rmhcontrol
	  The parameter 'expand' can now be in any format 
	  acceptable to rmhexpand().

    o   rmh.ppm, rmh.default, simulate.ppm
	  Any 'rmhcontrol' parameter can now be given directly 
	  as an argument to rmh.ppm, rmh.default or simulate.ppm.

    o   Kmulti, Gmulti, Jmulti
	  The arguments I, J can now be any kind of subset index
	  or can be functions that yield a subset index.

    o   envelope.envelope
	  In envelope(E, fun=NULL) if E does not contain simulated
	  summary functions, but does contain simulated point patterns, 
	  then 'fun' now defaults to Kest, instead of flagging an error.

    o   print.ppp, summary.ppp
	  If the point pattern x was generated by Metropolis-Hastings
	  simulation using 'rmh', then print(x) and summary(x) show 
	  information about the simulation parameters.

    o   print.ppm
	  Standard errors for the parameter estimates,
	  and confidence intervals for the parameters,
	  can now be printed for all Gibbs models 
	  (but are printed only for Poisson models by default).

    o   eval.im
	  Images with incompatible dimensions are now resampled 
	  to make them compatible (if harmonize=TRUE).

    o   spatstat.options
	  New option 'print.ppm.SE' controls whether standard errors 
	  and confidence intervals are printed for all Gibbs models,
	  for Poisson models only, or are never printed.

    o   inside.owin
	  Now accepts the form list(x,y) for the first argument.

    o   image.listof
	  New argument 'equal.ribbon' allows several images to be plotted
	  with the same colour map.

    o   is.subset.owin
	  Improved accuracy in marginal cases.

    o   expand.owin
	  Functionality extended to handle all types of expansion rule.

    o   default.rmhcontrol, default.expand
	  These functions now work with models of class 'rmhmodel' 
	  as well as 'ppm'

    o   print.rmhcontrol
	  Output improved.

BUG FIXES

    o   linearK, linearKinhom
	  If any data points were located exactly at a vertex of the 
	  linear network, the weights for Ang's correction were incorrect, 
	  due to numerical error. This sometimes produced infinite 
	  or NA values of the linear K function.
	  Fixed.

    o   predict.ppm
	  In some cases, predict.ppm(type="cif") generated a spurious warning 
	  that "number of rows of result is not a multiple of vector length."
	  Fixed.

    o   crossing.psp
	  Results were sometimes incorrect due to numerical rounding error
	  associated with GCC bug #323.
	  Fixed.

    o   MultiHard, MultiStrauss, MultiStraussHard
	  If the mark values contained non-alphanumeric characters,
	  the names of the interaction coefficients in coef(ppm(...)) 
	  were sometimes garbled.
	  Fixed.

    o   profilepl
	  For edge corrections other than the border correction,
	  an error message about 'rbord' would sometimes occur.
	  Fixed.

    o   is.marked, is.multitype
	  These functions gave the wrong answer for 'lpp' objects.
	  Fixed.

    o   marks<-.lpp,  marks<-.ppx
	  Format of result was garbled if new columns of marks were added.
	  Fixed.

    o   reach.rmhmodel
	  Gave the wrong answer for Geyer and BadGey models.
	  Fixed.

    o   envelope.envelope
	  Ignored the argument 'savefuns'.
	  Fixed.

    o   BadGey
	  Sometimes wrongly asserted that the parameter 'sat' was invalid.
	  Occurred only in ppm(project=TRUE).
	  Fixed.

                 Changes in version 1.26-1 (2012-04-19)                 

OVERVIEW 

    o   Variance-covariance matrix for Gibbs point process models.

    o   Bootstrap confidence bands for pair correlation function and K function.

    o   Bug fix in scan test.

    o   Area-interaction model accelerated.

    o   we thank Jean-Francois Coeurjolly and Ege Rubak for contributions.

NEW FUNCTIONS

    o   lohboot
	 Computes bootstrap confidence bands for pair correlation function
	 and K function using Loh's (2008) mark bootstrap.

SIGNIFICANT USER-VISIBLE CHANGES

    o   vcov.ppm
	 Now works for all Gibbs point process models, thanks to new code (and theory)
	 from Jean-Francois Coeurjolly and Ege Rubak

    o   AreaInter
	 Computations related to the area-interaction point process 
	 (ppm, predict.ppm, residuals.ppm, diagnose.ppm, qqplot.ppm)
	 have been accelerated.

BUG FIXES

    o   scan.test
	 Results were sometimes incorrect due to numerical instability
	 (a 'Gibbs phenomenon'). 
	 Fixed.

                 Changes in version 1.26-0 (2012-04-08)                 

OVERVIEW 

    o   We thank Jens Oehlschlaegel for contributions.

    o   Further substantial acceleration of spatstat functions.

    o   Workaround for bug in RandomFields package.

    o   Numerous modifications to internal code.

NEW FUNCTIONS

    o   RandomFieldsSafe
	  There is a bug in the package 'RandomFields' (version <= 2.0.54)
	  which causes a crash to occur, in the development version of R
	  but not in R 2.15.0. To avoid crashing spatstat, we have written
	  the temporary, undocumented function RandomFieldsSafe() 
	  which returns TRUE if it is safe to use the RandomFields package.
	  Examples in the spatstat help files for kppm, lgcp.estK, lgcp.estpcf
	  and rLGCP are only executed if RandomFieldsSafe() returns TRUE.

SIGNIFICANT USER-VISIBLE CHANGES

    o   Many functions
	  Many spatstat functions now run faster, and will handle larger datasets,
	  thanks to improvements in the internal code, 
	  following suggestions from Jens Oehlschlaegel.

    o   Many functions
	  The response to an 'Interrupt' signal is slightly slower.

                 Changes in version 1.25-5 (2012-03-14)                 

OVERVIEW 

    o   We thank Ya-Mei Chang, Jens Oehlschlaegel and Yong Song for contributions.

    o   Extended functionality of 'rhohat' to local likelihood smoothing
	  and bivariate smoothing.

    o   Nearest neighbour distance computations accelerated.

    o   spatstat now 'Suggests:' the package 'locfit'

NEW FUNCTIONS

    o   rho2hat
	  Bivariate extension of 'rhohat' for estimating spatial residual risk, 
	  or intensity as a function of two covariates.

SIGNIFICANT USER-VISIBLE CHANGES

    o   rhohat
	  Estimation can now be performed using local likelihood fitting
	  with the 'locfit' package, or using kernel smoothing.

    o   nncross
	  Substantially accelerated.
	  New arguments added to control the return value and the sorting of data.

BUG FIXES

    o   plot.msr
	  Crashed if the argument 'box' was given.
	  Fixed.

                 Changes in version 1.25-4 (2012-02-29)                 

OVERVIEW 

    o   We thank Jonathan Lee and Sergiy Protsiv for contributions.

    o   Improvements and bug fixes to K function for very large datasets

NEW FUNCTIONS

    o   rStraussHard
	  Perfect simulation for Strauss-hardcore process (with gamma <= 1)

SIGNIFICANT USER-VISIBLE CHANGES

    o   plot.im
	  The colour ribbon can now be placed left, right, top or bottom 
	  using new argument 'ribside'

    o   profilepl
	  Does not generate warnings when some of the candidate models
	  have zero likelihood - for example when fitting model with a hard core.

    o   Kest
	  Now includes fast algorithm for 'correction="none"'
	  which will handle patterns containing millions of points.

BUG FIXES

    o   Kest, Lest
	  Gave incorrect values in very large datasets, due to numerical overflow.
	  `Very large' typically means about 1 million points in a random pattern, 
	  or 100,000 points in a tightly clustered pattern.
	  [Overflow cannot occur unless there are at least 46,341 points.]
	  [Spotted by Sergiy Protsiv.]
	  Fixed.

    o   Kest, Lest
	  Ignored 'ratio=TRUE' if the argument 'domain' was given.
	  [Spotted by Jonathan Lee.]
	  Fixed.

    o   rjitter
	  Output was sometimes incorrect. 
	  [Spotted by Sergiy Protsiv.]
	  Fixed.

                 Changes in version 1.25-3 (2012-02-05)                 

OVERVIEW 

    o   We thank Daniel Esser for contributions.

    o   Improved support for fitted point process models.

    o   Bug fixes.

NEW FUNCTIONS

    o   simulate.slrm
	  Method for 'simulate' for spatial logistic regression models.

    o   labels.ppm, labels.kppm, labels.slrm
	  Methods for 'labels' for fitted point process models.

    o   commonGrid
	  Determine a common spatial domain and pixel resolution
	  for several pixel images and/or binary masks

SIGNIFICANT USER-VISIBLE CHANGES

    o   effectfun
	  Now has argument 'se.fit' allowing calculation of standard errors
	  and confidence intervals.

    o   [.msr
	  Now handles character-valued indices. 

    o   print.summary.ppm
	  Output gives a more precise description of the fitting method.

    o   ppm, kppm, slrm
	  Confidence intervals for the fitted trend parameters
	  can now be obtained using 'confint' 

    o   predict.slrm
	  New argument 'window' 

    o   union.owin
	  Now handles a single argument: union.owin(A) returns A.

BUG FIXES

    o   selfcrossing.psp
	  y coordinate values were incorrect.
	  [Spotted by Daniel Esser.]
	  Fixed.

    o   as.im.owin
	  Did not handle a binary mask with a 1 x 1 pixel array.
	  Fixed.

    o   predict.slrm
	  Results of predict(object, newdata) were incorrect 
	  if the spatial domain of 'newdata' was larger than the original domain.
	  Fixed.

    o   ppm
	  If the model was the uniform Poisson process,
	  the argument 'rbord' was ignored.
	  Fixed.

    o   image subset assignment "[<-.im"
	  Generated an error if the indexing argument 'i' 
	  was a point pattern containing zero points.
	  Fixed.

    o   hyperframe subset assignment "[<-.hyperframe"
	  Did not correctly handle the case where a single column 
	  of the hyperframe was to be changed.
	  Fixed.

    o   help(bw.relrisk), help(rmh.ppm), help(plot.plotppm)
	  These help files had the side-effect of changing some options
	  in spatstat.options.
	  Fixed.

                 Changes in version 1.25-2 (2012-01-19)                 

OVERVIEW 

    o   We thank Abdollah Jalilian and Thierry Onkelinx for contributions.

    o   Very Important Bug fixes.

    o   Improved mechanism for handling 'invalid' point processes

NEW FUNCTIONS

    o   as.matrix.owin
	  Converts a window to a logical matrix.

SIGNIFICANT USER-VISIBLE CHANGES

    o   project.ppm
	    Improved algorithm.
	    Now handles terms in the trend formula as well as the interaction.
	    The projected point process is now obtained by re-fitting the model,
	    and is guaranteed to be the maximum pseudolikelihood fit.

    o   plot.im
	    Now handles many arguments recognised by plot.default
	    such as 'cex.main'. Also handles argument 'box'.
	    New argument 'ribargs' contains parameters controlling the
	    ribbon plot only.      

    o   spatstat.options
	    New option 'project.fast' allows a faster shortcut for project.ppm

    o   spatstat.options
	    New options 'rmh.p', 'rmh.q', 'rmh.nrep' determine the default values
	    of the parameters p, q and nrep of the Metropolis-Hastings algorithm.
	    See rmhcontrol

    o   ppm
	    Slightly accelerated.

BUG FIXES

    o   nncross, distfun, AreaInter
	    Results of nncross were possibly incorrect 
	    when X and Y did not have the same window. 
	    This bug affected values of 'distfun' and may also 
	    have affected ppm objects with interaction 'AreaInter'.
	    [Spotted by Thierry Onkelinx]
	    Bug introduced in spatstat 1.9-4 (June 2006).
	    Fixed.

    o   rCauchy
	    Simulations were incorrect in the sense that 
	    the value of 'omega' was inadvertently doubled 
	    (i.e. omega was incorrectly replaced by 2 * omega).
	    Bug introduced in spatstat 1.25-0.
	    Fixed.

    o   plot.im
	    White lines were present in the image display, on some graphics devices,
	    due to changes in R 2.14.
	    Fixed.

    o   update.ppm
	    The result of 'update(object, formula)' sometimes contained errors
	    in the internal format.
	    Bug introduced in spatstat 1.25-0.
	    Fixed.

    o   example(AreaInter), example(bw.smoothppp),
	  example(Kest.fft), example(plot.owin), example(predict.ppm),
	  example(simulate.ppm)
	Executing these examples had the side-effect of
	changing some of the parameters in spatstat.options.
	Fixed.

                 Changes in version 1.25-1 (2011-12-21)                 

OVERVIEW 

    o   We thank Neba Funwi-Gabga and Jorge Mateu for contributions.

    o   New dataset of gorilla nest sites

    o   New functions for perfect simulation 

    o   Bug fix for rare crashes in rStrauss

    o   Code for ensuring a fitted point process model is a valid point process

NEW DATASET

    o   gorillas
	  Gorilla nest sites in a National Park in Cameroon.
	  Generously contributed by Neba Funwi-Gabga

NEW FUNCTIONS

    o   rDiggleGratton, rDGS, rHardcore
	  Perfect simulation for the Diggle-Gratton process,
	  Diggle-Gates-Stibbard process, and Hardcore process.

    o   bw.scott
	  Scott's rule of thumb for bandwidth selection in
	  multidimensional smoothing

    o   valid.ppm
	  Checks whether a fitted point process model is a valid point process

    o   project.ppm
	  Forces a fitted point process model to be a valid point process

SIGNIFICANT USER-VISIBLE CHANGES

    o   ppm
	  New argument 'project' determines whether the fitted model
	  is forced to be a valid point process

    o   linnet
	  Substantially accelerated.

    o   rStrauss
	  Slightly accelerated.

    o   summary.lpp
	  Now prints the units of length.

BUG FIXES

    o   rStrauss
	  Crashed rarely (once every 10 000 realisations)
	  with a memory segmentation fault.
	  Fixed.

                 Changes in version 1.25-0 (2011-12-06)                 

OVERVIEW 

    o   Leverage and influence for point process models

    o   New cluster models (support for model-fitting and simulation).

    o   Fit irregular parameters in trend of point process model

    o   Third order summary statistic.

    o   Improvements to speed and robustness of code.

    o   spatstat now depends on R 2.14

    o   We thank Abdollah Jalilian and Rasmus Waagepetersen for contributions.

NEW FUNCTIONS

    o   leverage.ppm, influence.ppm, dfbetas.ppm
	  Leverage and influence for point process models

    o   ippm
	  Experimental extension to 'ppm' which fits irregular parameters in trend
	  by Fisher scoring algorithm.

    o   Tstat
	  Third order summary statistic for point patterns
	  based on counting triangles.

    o   rCauchy, rVarGamma
	  simulation of a Neyman-Scott process with Cauchy clusters
	  or Variance Gamma (Bessel) clusters.
	  Contributed by Abdollah Jalilian.

    o   rPoissonCluster
	  simulation of a general Poisson cluster process

    o   model.covariates
	  Identify the covariates involved in a model (lm, glm, ppm etc)

    o   as.im.distfun
	  Converts a 'distfun' to a pixel image.

    o   cauchy.estK, cauchy.estpcf, vargamma.estK, vargamma.estpcf
	  Low-level model-fitting functions for the Neyman-Scott process 
	  with Cauchy or Variance-Gamma cluster kernel.
	  Contributed by Abdollah Jalilian.

SIGNIFICANT USER-VISIBLE CHANGES

    o   kppm
	  Now accepts clusters="Cauchy" or clusters="VarGamma"
	  for the Neyman-Scott process with Cauchy or Variance-Gamma cluster kernel.
	  Code contributed by Abdollah Jalilian.

    o   rNeymanScott
	  Argument 'rcluster' may now take a different format.

    o   psst
	  Argument 'funcorrection' changed to 'funargs' allowing greater flexibility.

    o   plot.fv, plot.envelope
	  New argument 'limitsonly' allows calculation of 
	  a common x,y scale for several plots.

    o   overall speed 
	  spatstat is now byte-compiled and runs slightly faster.

    o   user interrupt
	  Long calculations in spatstat now respond to the Interrupt/Stop signal.

    o   update.ppm
	  Now runs faster and uses much less memory,
	  when the update only affects the model formula (trend formula).

    o   rNeymanScott, rThomas, rMatClust
	  Accelerated thanks to Rasmus Waagepetersen.

    o   multitype data and models
	  Second order multitype statistics (such as Kcross, pcfcross)
	  and multitype interaction models (such as MultiStrauss)
	  now run faster, by a further 5%.

BUG FIXES

    o   distfun
	  Some manipulations involving 'distfun' objects failed if the
	  original data X in distfun(X) did not have a rectangular window.
	  Fixed.

                 Changes in version 1.24-2 (2011-11-11)                 

OVERVIEW 

    o   Geyer's triplet interaction

    o   more functionality for replicated point patterns

    o   changed default for simulation window in point process simulation

    o   changed default for edge correction in Kcom, Gcom

    o   data in spatstat is now lazy-loaded

    o   bug fixes 

NEW FUNCTIONS

    o   Triplets
	  Geyer's triplet interaction, for point process models

    o   coef.summary.ppm
	  New method coef.summary.ppm
	  You can now type 'coef(summary(fit))' to extract a table
	  of the fitted coefficients of the point process model 'fit'

SIGNIFICANT USER-VISIBLE CHANGES

    o   data in spatstat are now lazy-loaded
	  so you don't have to type data(amacrine), etc.

    o   rmh.default, rmh.ppm, simulate.ppm
	  These now handle the 'triplets' interaction

    o   fryplot
	  Now has arguments 'to' and 'from', allowing 
	  selection of a subset of points.

    o   fryplot, frypoints
	  These functions now handle marked point patterns properly.

    o   Kcross, Kdot, Kmulti
	  New argument 'ratio' determines whether the numerator and denominator
	  of the estimate of the multitype K-function will be stored. 
	  This enables analysis of replicated point patterns, 
	  using 'pool.rat()' to pool the K function estimates.

    o   rmh.ppm, simulate.ppm, default.expand
	  For point process models which have a trend depending only on x and y,
	  the simulation window is now taken to be the same as the original 
	  window containing the data (by default). 
	  That is, `expansion' does not take place, by default.
	  (In previous versions of spatstat the simulation window was larger
	  than the original data window.)

    o   rmh.ppm, simulate.ppm
	  The argument sequence for these functions has changed.
	  New argument 'expand' allows more explicit control over simulation domain.

    o   Kcom, Gcom
	  New argument 'conditional' gives more explicit control
	  over choice of edge correction in compensator.
	  Simplified defaults for edge correction.  

    o   Kinhom
	  Improved plot labels.

    o   profilepl
	  Printed output improved.

BUG FIXES

    o   Lest
	  The variance approximations (Lotwick-Silverman and Ripley)
	  obtained with var.approx=TRUE, were incorrect for Lest 
	  (although they were correct for Kest) due to a coding error.
	  Fixed.

    o   simulate.ppm
	  Ignored the argument 'control' in some cases. 
	  Fixed.

    o   pcf and its relatives (pcfinhom, pcfcross.inhom, pcfdot.inhom)
	  Sometimes gave a warning about 'extra arguments ignored'.
	  Fixed.

                 Changes in version 1.24-1 (2011-10-23)                 

OVERVIEW 

    o   Spatial Scan Test

    o   Functionality for replicated point patterns

    o   Bug fixes

NEW FUNCTIONS

    o   scan.test
	    Spatial scan test of clustering

    o   rat
	  New class of 'ratio objects'

    o   pool.rat
	  New method for 'pool'.
	  Combines K function estimates for replicated point patterns (etc) 
	  by computing ratio-of-sums 

    o   unnormdensity
	  Weighted kernel density with weights that do not sum to 1
	  and may be negative.

    o   compatible
	  New generic function with methods for 'fv', 'im', 'fasp' and 'units'

SIGNIFICANT USER-VISIBLE CHANGES

    o   Kest
	  New argument 'ratio' determines whether the numerator and denominator
	  of the estimate of the K-function will be stored. 
	  This enables analysis of replicated point patterns, 
	  using 'pool.rat()' to pool the K function estimates.

    o   Lest
	  Now handles theoretical variance estimates (using delta method)
	  if var.approx=TRUE

    o   as.mask
	  Argument 'eps' can now be a 2-vector, specifying x and y resolutions.

    o   default.expand
	  Behaviour changed slightly.

    o   plot.listof, plot.splitppp, contour.listof, image.listof
	  The arguments 'panel.begin' and 'panel.end' can now be objects
	  such as windows. 

BUG FIXES

    o   rgbim, hsvim
	  Did not work on images with non-rectangular domains.
	  Fixed.

    o   scaletointerval
	  Did not handle NA's.
	  Fixed.

                       Changes in version 1.24-0                        

OVERVIEW 

    o   This version was not released publicly.

                 Changes in version 1.23-6 (2011-10-11)                 

OVERVIEW 

    o   Spatial covariance functions of windows and pixel images.

    o   Area-interaction models can now be fitted in non-rectangular windows

    o   Bug fix for envelope of inhomogeneous Poisson process

    o   Bug fix for raster conversion

    o   New vignette on 'Getting Started with Spatstat'

    o   Code accelerated.

NEW FUNCTIONS

    o   imcov
	  Spatial covariance function of pixel image
	  or spatial cross-covariance function of two pixel images

    o   harmonise.im
	  Make several pixel images compatible 
	  by converting them to the same pixel grid

    o   contour.listof, image.listof
	  Methods for contour() and image() for lists of objects

    o   dummify
	  Convert data to numeric values by constructing dummy variables.

SIGNIFICANT USER-VISIBLE CHANGES

    o   setcov
	  Can now compute the `cross-covariance' between two regions

    o   AreaInter
	  Point process models with the AreaInter() interaction
	  can now be fitted to point pattern data X in any window.

    o   areaGain, areaLoss
	  These now handle arbitrary windows W.
	  They are now more accurate when r is very small.

    o   Kcom
	  Computation vastly accelerated, for non-rectangular windows.

    o   vignettes
	  New vignette 'Getting Started with the Spatstat Package'

    o   nncorr, nnmean, nnvario
	  These functions now handle data frames of marks.

BUG FIXES

    o   envelope.ppm
	  If the model was an inhomogeneous Poisson process, 
	  the resulting envelope object was incorrect
	  (the simulations were correct, but the envelopes were calculated
	  assuming the model was CSR). Bug was introduced in spatstat 1.23-5.
	  Fixed.

    o   envelope.ppm
	  If the model was an inhomogeneous Poisson process 
	  with intensity a function of x and y only,
	  overflow errors sometimes occurred ('insufficient storage' 
	  or 'attempting to generate a large number of random points').
	  Fixed.

    o   as.im.im
	  The result of as.im(X, W) was incorrect if 'W' did not cover 'X'.
	  Fixed.

    o   as.mask
	  The result of as.mask(w, xy) was incorrect if 'xy' did not cover 'w'.
	  Fixed.

    o   plot.fv
	  Legend was incorrectly labelled if 'shade' variables were not included
	  in the plot formula.
	  Fixed.

    o   areaGain, areaLoss
	  Crashed if the radius r was close to zero.
	  Fixed.

                 Changes in version 1.23-5 (2011-09-23)                 

OVERVIEW 

    o   Bug fix to bandwidth selection.

    o   Functions to pool data from several objects of the same class.

    o   Improvements and bug fixes.

    o   We thank Michael Sumner for contributions.

NEW FUNCTIONS

    o   pool
	  Pool data from several objects of the same class

    o   pool.envelope
	  Pool simulated data from several envelope objects and create a new envelope

    o   pool.fasp
	  Pool simulated data from several function arrays and create a new array

    o   envelope.envelope
	  Recalculate an envelope from simulated data using different parameters

SIGNIFICANT USER-VISIBLE CHANGES

    o   bw.diggle, bw.relrisk, bw.smoothppp, bw.optim
	  Plot method modified.

    o   model.depends
	  Now also recognises 'offset' terms.

BUG FIXES

    o   bw.diggle
	  Bandwidth was too large by a factor of 2.
	  Fixed.

    o   plot.psp
	  Crashed if any marks were NA.
	  Fixed.

    o   pointsOnLines
	  Crashed if any segments had zero length.
	  Ignored argument 'np' in some cases.
	  Fixed.

    o   stieltjes
	  Crashed if M had only a single column of function values.
	  Fixed.

                 Changes in version 1.23-4 (2011-09-09)                 

OVERVIEW 

    o   Bandwidth selection for density.ppp and smooth.ppp

    o   Layered plots. 

    o   Model-handling facilities.

    o   Improvements and bug fixes.

NEW FUNCTIONS

    o   bw.diggle
	  Bandwidth selection for density.ppp by mean square error cross-validation.

    o   bw.smoothppp
	  Bandwidth selection for smooth.ppp by least-squares cross-validation.

    o   layered, plot.layered
	  A simple mechanism for controlling plots that consist of
	  several successive layers of data.

    o   model.depends
	  Given a fitted model (of any kind), identify which of the covariates
	  is involved in each term of the model.

    o   model.is.additive
	  Determine whether a fitted model  (of any kind) is additive, 
	  in the sense that each term in the model involves at most one covariate.

SIGNIFICANT USER-VISIBLE CHANGES

    o   smooth.ppp
	  Bandwidth 'sigma' is now selected by least-squares cross-validation

    o   bw.relrisk
	  Computation in large datasets accelerated.
	  New arguments 'hmin', 'hmax' control the range of trial values of bandwidth.

    o   Hest, Gfox, Jfox
	  Improved algebraic labels for plot

    o   spatstat.options
	  New parameter 'n.bandwidth'

    o   density.ppp, smooth.ppp
	  Slightly accelerated.

    o   point-in-polygon test
	  Accelerated.

BUG FIXES

    o   with.fv
	   Mathematical labels were incorrect in some cases.
	   Fixed.

    o   bw.relrisk
	   Implementation of method="weightedleastsquares" was incorrect
	   and was equivalent to method="leastsquares".
	   Fixed.

    o   smooth.ppp
	   NaN values occurred if the bandwidth was very small.
	   Fixed.

                 Changes in version 1.23-3 (2011-08-12)                 

OVERVIEW 

    o   Urgent bug fix.

BUG FIXES

    o   crossing.psp
	   Crashed occasionally with a message about NA or NaN values.
	   Fixed.

    o   affine.ppp
	   Crashed if the point pattern was empty.
	   Fixed.

                 Changes in version 1.23-2 (2011-08-11)                 

OVERVIEW 

    o   Bug fixes.

    o   Several functions have been accelerated.

    o   We thank Marcelino de la Cruz and Ben Madin for contributions.

NEW FUNCTIONS

    o   sumouter, quadform
	   Evaluate certain quadratic forms.

    o   flipxy
	   Exchange x and y coordinates.

SIGNIFICANT USER-VISIBLE CHANGES

    o   vcov.ppm
	  Accelerated.

    o   owin, as.owin
	  Checking the validity of polygons has been accelerated.

    o   crossing.psp, selfcrossing.psp
	  Accelerated.

BUG FIXES

    o   split.ppp
	   If drop=TRUE then some of the point patterns had the wrong windows.
	   Spotted by Marcelino de la Cruz.
	   Fixed.

    o   split.ppp
	   Crashed if the tessellation did not cover the point pattern.
	   Fixed.

    o   predict.ppm
	   Crashed when type="se" if NA's were present.
	   Spotted by Ben Madin.
	   Fixed.

    o   plot.ppp
	   Incorrectly handled the case where both 'col' and 'cols' were present.
	   Fixed.

    o   polygon geometry
	   The point-in-polygon test gave the wrong answer in some boundary cases.
	   Fixed.

                 Changes in version 1.23-1 (2011-08-01)                 

OVERVIEW 

    o   Important bug fix to 'localpcf'.

    o   Inverse-distance weighted smoothing.

    o   Inhomogeneous versions of neighbourhood density functions.

    o   Internal repairs and bug fixes.

    o   We thank Mike Kuhn and Ben Madin for contributions.

NEW FUNCTIONS

    o   idw
	     Inverse-distance weighted smoothing.

    o   localKinhom, localLinhom, localpcfinhom
	     Inhomogeneous versions of localK, localL, localpcf

BUG FIXES

    o   localpcf
	     The columns of the result were in the wrong order.
	     [i.e. pair correlation functions were associated with the wrong points.]
	     Fixed.

    o   delaunay
	     If the union of several Delaunay triangles formed a triangle,
	     this was erroneously included in the result of delaunay().
	     Fixed.

    o   predict.ppm, plot.ppm
	     Sometimes crashed with a warning about 'subscript out of bounds'.
	     Fixed.      

    o   point-in-polygon test
	     Vertices of a polygon were sometimes incorrectly classified
	     as lying outside the polygon. 
	     Fixed.

    o   Internal code
	     Numerous tweaks and repairs to satisfy the package checker
	     for the future R version 2.14.

                 Changes in version 1.23-0 (2011-07-24)                 

OVERVIEW 

    o   point patterns on a linear network:
	      new tools including geometrically-corrected linear K function, 
	      pair correlation function, point process models, envelopes

    o   changes to renormalisation of estimates in Kinhom and pcfinhom

    o   new dataset: Chicago street crime

    o   spatstat now 'Suggests:' the package RandomFields

    o   spatstat now has a Namespace

    o   we thank Mike Kuhn, Monia Mahling, Brian Ripley for contributions.

NEW DATASET

    o   chicago
	   Street crimes in the University district of Chicago.
	   A point pattern on a linear network.

NEW FUNCTIONS

    o   envelope.lpp
	     Simulation envelopes for point patterns on a linear network

    o   lineardisc
	     Compute the 'disc' of radius r in a linear network 

    o   linearpcf 
	     Pair correlation for point pattern on a linear network

    o   linearKinhom, linearpcfinhom
	     Inhomogeneous versions of the K function and pair correlation function
	     for point patterns on a linear network

    o   lppm 
	     Fit point process models on a linear network.

    o   anova.lppm
	     Analysis of deviance for point process models on a linear network.

    o   predict.lppm
	     Prediction for point process models on a linear network.

    o   envelope.lppm
	     Simulation envelopes for point process models on a linear network.

    o   linim
	     Pixel image on a linear network

    o   plot.linim
	     Plot a pixel image on a linear network

SIGNIFICANT USER-VISIBLE CHANGES

    o   linearK
	    New argument 'correction'.
	    Geometrically-corrected estimation is performed by default
	    (based on forthcoming paper by Ang, Baddeley and Nair)

    o   Kinhom
	    New argument 'normpower' allows different types of renormalisation.

    o   pcfinhom
	    Now performs renormalisation of estimate. 
	    Default behaviour changed - estimates are now renormalised by default.

BUG FIXES

    o   density.ppp
	      Crashed if argument 'varcov' was given.
	      Fixed.

                       Changes in version 1.22-4                        

OVERVIEW 

    o   new diagnostics based on score residuals

    o   new dataset

    o   improvements to plotting summary functions 

    o   We thank Ege Rubak, Jesper Moller, George Leser, Robert Lamb
	      and Ulf Mehlig for contributions.

NEW FUNCTIONS

    o   Gcom, Gres, Kcom, Kres
	      New diagnostics for fitted Gibbs or Poisson point process models
	      based on score residuals.
	      Gcom is the compensator of the G function
	      Gres is the residual of the G function
	      Kcom is the compensator of the K function
	      Kres is the residual of the K function

    o   psst, psstA, psstG
	      New diagnostics for fitted Gibbs or Poisson point process models
	      based on pseudoscore residuals.
	      psst is the pseudoscore diagnostic for a general alternative
	      psstA is the pseudoscore diagnostic for an Area-interaction alternative
	      psstG is the pseudoscore diagnostic for a Geyer saturation alternative

    o   compareFit
	      Computes and compares several point process models
	      fitted to the same dataset, using a chosen diagnostic.

    o   as.interact
	      Extracts the interpoint interaction structure (without parameters)
	      from a fitted point process model or similar object.

NEW DATASET

    o   flu
	      Spatial point patterns giving the locations of 
	      influenza virus proteins on cell membranes.
	      Kindly released by Dr George Leser and Dr Robert Lamb.

SIGNIFICANT USER-VISIBLE CHANGES

    o   pixel images and grids
	     The default size of a pixel grid, given by spatstat.options("npixel"),
	     has been changed from 100 to 128. A power of 2 gives faster
	     and more accurate results in many cases.

    o   residuals.ppm
	      New arguments 'coefs' and 'quad' for advanced use
	      (make it possible to compute residuals from a
	       modified version of the fitted model.)

    o   relrisk 	
	      New argument 'casecontrol' determines whether a bivariate
	      point pattern should be treated as case-control data.

    o   plot.fv
	      Further improvements in mathematical labels.

    o   plot.fv
	      The formula can now include the symbols .x and .y
	      as abbreviation for the function argument and the 
	      recommended function value, respectively.

    o   plot.fv
	      New argument 'add'

BUG FIXES

    o   multitype summary functions
	      (Kcross, Kdot, Gcross, Gdot, .....)
	      Plotting these functions generated an error if the 
	      name of one of the types of points contained spaces,
	      e.g. "Escherichia coli". 
	      Fixed.

                 Changes in version 1.22-3 (2011-06-17)                 

OVERVIEW 

    o   Important bug fix to simulation code

    o   Miscellaneous improvements

    o   spatstat now depends on R 2.13.0 or later

    o   We thank Ege Rubak, Kaspar Stucki, Vadim Shcherbakov,
	      Jesper Moller and Ben Taylor for contributions.

NEW FUNCTIONS

    o   is.stationary, is.poisson
	      New generic functions for testing whether a point process model 
	      is stationary and/or Poisson.
	      Methods for ppm, kppm, slrm etc

    o   raster.xy
	      raster coordinates of a pixel mask

    o   zapsmall.im
	      'zapsmall' for pixel images

SIGNIFICANT USER-VISIBLE CHANGES

    o   density.ppp
	      New argument 'diggle' allows choice of edge correction

    o   rotate.owin, affine.owin
	      These functions now handle binary pixel masks.
	      New argument 'rescue' determines whether rectangles will be preserved

BUG FIXES

    o   rmh, simulate.ppm
	      Serious bug - simulation was completely incorrect in the case of 
	      a multitype point process with an interaction that does not depend
	      on the marks, such as ppm(betacells, ~marks, Strauss(60))
	      The calling parameters were garbled.
	      Fixed.

    o   effectfun
	      Crashed if the covariate was a function(x,y).
	      Fixed.

    o   lurking
	      Gave erroneous error messages about 'damaged' models.
	      Fixed.

    o   envelope.ppm
	      Did not recognise when the fitted model was equivalent to CSR.
	      Fixed.

    o   plot.ppx
	      Crashed in some cases. Fixed.

                 Changes in version 1.22-2 (2011-06-15)                 

OVERVIEW 

    o   Fitting and simulation of log-Gaussian Cox processes
	      with any covariance function

    o   More support for 'kppm' and 'rhohat' objects

    o   K-function for point patterns on a linear network

    o   Metropolis-Hastings algorithm now saves its transition history

    o   Easier control of dummy points in ppm

    o   Convert an 'fv' object to an R function 

    o   spatstat now depends on the package 'RandomFields'

    o   We thank Abdollah Jalilian, Shen Guochun, Rasmus Waagepetersen,
	      Ege Rubak and Ang Qi Wei for contributions.

NEW FUNCTIONS

    o   linearK
	     Computes the Okabe-Yamada network K-function 
	     for a point pattern on a linear network.

    o   pairdist.lpp
	     Shortest-path distances between each pair of points 
	     on a linear network.

    o   vcov.kppm
	     Asymptotic variance-covariance matrix for regression parameters
	     in kppm object. 
	     [Contributed by Abdollah Jalilian and Rasmus Waagepetersen]

    o   rLGCP
	     Simulation of log-Gaussian Cox processes
	     [Contributed by Abdollah Jalilian and Rasmus Waagepetersen]

    o   predict.rhohat
	     Method for 'predict' for objects of class 'rhohat'
	     Computes a pixel image of the predicted intensity.

    o   Kmodel, pcfmodel
	     Generic functions that compute the K-function or pair correlation function
	     of a point process *model*. 
	     So far the only methods are for the class 'kppm'.

    o   as.function.fv
	     Converts a function value table (class 'fv') to a function in R

    o   coef.kppm
	     Method for 'coef' for objects of class 'kppm'

    o   unitname, unitname<- 
	     These generic functions now have methods for fitted model objects
	     (classes ppm, slrm, kppm, minconfit) and quadrature schemes (quad).

    o   nobs.ppm
	     Method for 'nobs' for class 'ppm'.
	     Returns the number of points in the original data.

SIGNIFICANT USER-VISIBLE CHANGES

    o   kppm
	     Can now fit a log-Gaussian Cox process

    o   simulate.kppm
	     Can now simulate a fitted log-Gaussian Cox process

    o   lgcp.estK, lgcp.estpcf
	     These functions previously fitted a log-Gaussian Cox process
	     with exponential covariance. They can now fit a log-Gaussian Cox process
	     with any covariance function implemented by the RandomFields package.

    o   rmh
	     If track=TRUE, the history of transitions of the Metropolis-Hastings
	     algorithm is saved and returned.

    o   ppm
	     New argument 'nd' controls the number of dummy points.

    o   as.fv
	     Now handles objects of class kppm or minconfit.

    o   rhohat
	     If covariate = "x" or "y", the resulting object has the same
	     'unitname' as the original point pattern data.

    o   rhohat
	     Now has arguments 'eps, 'dimyx' to control pixel resolution.

    o   MultiStrauss, MultiHard, MultiStraussHard
	     Default value of 'types' has been changed to NULL.

    o   data(ants)
	     The auxiliary data 'ants.extra' now includes a function called 'side'
	     determining whether a given location is in the scrub or field region.
	     Can be used as a covariate in ppm, kppm, slrm.

    o   print.ppm
	     Now has argument 'what' to allow only selected information to be printed.

BUG FIXES

    o   profilepl
	     Crashed in some cases involving multitype interactions.
	     Fixed.

    o   plot.splitppp
	     Behaved incorrectly if 'main' was an expression.
	     Fixed.

    o   effectfun
	     Crashed in trivial cases.
	     Fixed.

    o   kppm, thomas.estpcf, matclust.estpcf, lgcp.estpcf
	     Gave a spurious warning message.
	     Fixed.

    o   step
	     When applied to ppm objects this gave a spurious warning.
	     Fixed.

                 Changes in version 1.22-1 (2011-05-19)                 

OVERVIEW 

    o   marked line segment patterns can now be plotted

    o   multitype point process models are now 'self-starting'

    o   new functions to manipulate colour images

NEW FUNCTIONS

    o   rgbim, hsvim
	     Specify three colour channels.
	     These functions convert three pixel images with numeric values
	     into a single image whose pixel values are strings representing colours.

    o   scaletointerval
	     Generic utility function to rescale data (including spatial data)
	     to a specified interval

SIGNIFICANT USER-VISIBLE CHANGES

    o   plot.im
	     Can now plot images whose pixel values are strings representing colours.
	     New argument 'valuesAreColours'

    o   plot.psp
	     Now handles marked line segment patterns 
	     and plots the marks as colours.

    o   MultiHard, MultiStrauss, MultiStraussHard
	     The argument 'types' can now be omitted;
	     it will be inferred from the point pattern data.

    o   rhohat
	     Improved mathematical labels (when the result of rhohat is plotted)

    o   plot.fv
	     Minor improvements in graphics

BUG FIXES

    o   several minor bug fixes and improvements to satisfy R-devel

                 Changes in version 1.22-0 (2011-04-28)                 

OVERVIEW 

    o   support for point patterns on a linear network

    o   'superimpose' is now generic

    o   improved mathematical labels when plotting functions

NEW CLASSES

    o   linnet
	     An object of class 'linnet' represents a linear network,
	     i.e. a connected network of line segments, such as a road network.
	     Methods for this class include plot, print, summary etc.

    o   lpp
	     An object of class 'lpp' represents a point pattern on a linear network,
	     such as a record of the locations of road accidents on a road network.
	     Methods for this class include plot, print, summary etc.

NEW FUNCTIONS

    o   runiflpp
	     Uniformly distributed random points on a linear network

    o   rpoislpp
	     Poisson point process on a linear network

    o   clickjoin
	     Interactive graphics to create a linear network

    o   superimpose
	     The function 'superimpose' is now generic, with methods
	     for ppp, psp and a default method.

    o   as.ppp.psp 
	     New method for as.ppp extracts the endpoints and marks
	     from a line segment pattern

NEW DATASETS

    o   simplenet
	     Simple example of a linear network

SIGNIFICANT USER-VISIBLE CHANGES

    o   superimposePSP 
	     This function is now deprecated in favour of 'superimpose'

    o   superimpose
	     Now handles data frames of marks.

    o   plot.fv
	     Argument 'legendmath' now defaults to TRUE.
	     New argument 'legendargs' gives more control over appearance of legend.
	     Increased default spacing between lines in legend.

    o   eval.fv, with.fv
	     Functions computed using eval.fv or with.fv
	     now have better labels when plotted.

    o   summary functions
	   (Kest, Kest.fft, Kcross, Kdot, Kmulti,
	   Kinhom, Kcross.inhom, Kdot.inhom, Kmulti.inhom,
	   Lest, Lcross, Ldot, 
	   pcf, pcfcross, pcfdot, pcfinhom, pcfcross.inhom, pcfdot.inhom,
	   Fest, Gest, Gcross, Gdot, Gmulti,
	   Jest, Jcross, Jdot, Jmulti, Iest,
	   localL, localK,
	   markcorr, markvario, markconnect, Emark, Vmark, 
	   allstats, alltypes)
	        Improved plot labels.

BUG FIXES

    o   superimpose
	     If the marks components of patterns consisted of character
	     vectors (rather than factors or non-factor numeric vectors)
	     an error was triggered.
	     Fixed.

    o   plot.fv
	     The y axis limits did not always cover the range of values
	     if the argument 'shade' was used.
	     Fixed.

    o   plot.rhohat
	     The y axis label was sometimes incorrect.
	     Fixed.

    o   plot.rhohat
	     If argument 'xlim' was used, a warning was generated from 'rug'.
	     Fixed.

                 Changes in version 1.21-6 (2011-03-26)                 

OVERVIEW 

    o   A line segment pattern can now have a data frame of marks.

    o   Various minor extensions and alterations in behaviour

NEW FUNCTIONS

    o   nsegments
	   	Number of segments in a line segment pattern

SIGNIFICANT USER-VISIBLE CHANGES

    o   psp class
	       A line segment pattern (object of class 'psp') can now have a 
	data frame of marks. 

    o   density.ppp
	   	New argument 'adjust' makes it easy to adjust the smoothing bandwidth

    o   plot.envelope
	   	If the upper envelope is NA but the lower envelope is finite,
	the upper limit is now treated as +Infinity

    o   msr
	       Argument 'continuous' renamed 'density'

BUG FIXES    

    o   [.psp 
	       In X[W] if X is a line segment pattern and W is a polygonal window,
	marks were sometimes discarded, leading to an error.
	Fixed.

    o   [.psp 
	       In X[W] if X is a line segment pattern and W is a rectangular window,
	if the marks of X were factor values, they were converted to integers.
	Fixed.

    o   superimposePSP
	   	If the marks were a factor, they were mistakenly converted to integers.
	Fixed.

    o   is.marked.ppp 
	   	Did not generate a fatal error when na.action="fatal" as described
	in the help file. 
	Fixed. 

                 Changes in version 1.21-5 (2011-02-10)                 

OVERVIEW 

    o   Increased numerical stability.

    o   New 'self-starting' feature of interpoint interactions.

SIGNIFICANT USER-VISIBLE CHANGES

    o   ppm
	       Interaction objects may now be 'self-starting'
	   	i.e. initial parameter estimates can be computed
	from the point pattern dataset. 
	So far, only the LennardJones() interaction 
	has a self-starting feature.

    o   LennardJones
	Increased numerical stability.
	New (optional) scaling argument 'sigma0'.
	Interpoint distances are automatically rescaled
	using 'self-starting' feature. 

    o   vcov.ppm
	New argument 'matrix.action' controls what happens when
	the matrix is ill-conditioned.
	Changed name of argument 'gamaction' to 'gam.action'

    o   rmhmodel.ppm
	Default resolution of trend image has been increased.

    o   is.poisson.ppm
	Accelerated.

    o   ppm, kppm, qqplot.ppm
	Improved robustness to numerical error

                 Changes in version 1.21-4 (2011-01-20)                 

OVERVIEW 

    o   Urgent bug fix

BUG FIXES

    o   print.summary.ppm exited with an error message,
	   	if the model had external covariates.
	   	Fixed.

                 Changes in version 1.21-3 (2011-01-17)                 

OVERVIEW 

    o   Point process model covariates may now depend on additional parameters.

    o   New class of signed measures, for residual analysis.

    o   Miscellaneous improvements and bug fixes.

NEW FUNCTIONS

    o   clarkevans.test
	   	Classical Clark-Evans test of randomness

    o   msr
	New class 'msr' of signed measures and vector-valued measures
	supporting residual analysis.

    o   quadrat.test.quadratcount
	Method for 'quadrat.test' for objects of class 'quadratcount'
	(allows a chi-squared test to be performed on quadrat counts
	rather than recomputing from the original data)

    o   tile.areas
	Computes areas of tiles in a tessellation (efficiently)

SIGNIFICANT USER-VISIBLE CHANGES

    o   ppm
	The spatial trend can now depend on additional parameters.
	This is done by allowing spatial covariate functions
	to have	additional parameters: function(x, y, ...)
	where ... is controlled by the new argument 'covfunargs' to ppm

    o   profilepl
	Can now maximise over trend parameters as well as interaction parameters

    o   residuals.ppm
	   	The value returned by residuals.ppm is now an object 
	of class 'msr'. It can be plotted directly.

    o   eval.im
	When the argument 'envir' is used, eval.im() now recognises
	functions as well as variables in 'envir'

    o   colourmap
	The argument 'col' can now be any kind of colour data

    o   persp.im
	The 'colmap' argument can now be a 'colourmap' object

    o   ppm
	   	The print and summary methods for 'ppm' objects 
	now show standard errors for parameter estimates
	if the model is Poisson.

    o   quadrat.test
	The print method for 'quadrattest' objects
	now displays information about the quadrats

    o   lurking
	   	Improved format of x axis label

    o   distmap.ppp
	  	Internal code is more robust.

BUG FIXES

    o   im
	Did not correctly handle 1 x 1 arrays.
	Fixed.

    o   as.mask, pixellate.ppp
	   	Weird things happened if the argument 'eps' was set
	to a value greater than the size of the window.
	Fixed.

                 Changes in version 1.21-2 (2010-11-29)                 

OVERVIEW 

    o   New multitype hardcore interaction.

    o   Nonparametric estimation of covariate effects on point patterns.

    o   Output of 'Kmeasure' has been rescaled.

    o   Numerous improvements and bug fixes.

NEW FUNCTIONS

    o   MultiHard
	   	multitype hard core interaction for use in ppm() 

    o   coords<-
	   	Assign new coordinates to the points in a point pattern

    o   rhohat
	   	Kernel estimate for the effect of a spatial covariate
	on point process intensity

SIGNIFICANT USER-VISIBLE CHANGES

    o   as.ppp.matrix, as.ppp.data.frame
	   	These methods for 'as.ppp' now accept a matrix or data frame
	with any number of columns (>= 2) and interpret the additional
	columns as marks.

    o   Kmeasure
	   	The interpretation of the output has changed:
	the pixel values are now density estimates.

    o   rmh.ppm, rmhmodel.ppm
	   	These functions now accept a point process model
	fitted with the 'MultiHard' interaction

    o   rmh.default, rmhmodel.default
	   	These functions now accept the option: cif='multihard'
	defining a multitype hard core interaction.	

    o   markcorr
	   	Now handles a data frame of marks

    o   varblock
	   	Improved estimate in the case of the K function

    o   colourmap, lut
	   	New argument 'range' makes it easier to specify a colour map
	or lookup table

    o   [<-.hyperframe
	   	Now handles multiple columns

    o   plot.fv
	   	Improved y axis labels

    o   spatstat.options
	   	New option 'par.fv' controls default parameters for line plotting

    o   rmhmodel
	   	More safety checks on parameter values.

    o   quadratresample
	   	New argument 'verbose'

    o   smooth.fv
	   	Default value of 'which' has been changed.

BUG FIXES

    o   Kest
	   	If the argument 'domain' was used, the resulting estimate
	was not correctly normalised.
	Fixed.

    o   Kest
	   	The Lotwick-Silverman variance approximation was incorrectly
	calculated. (Spotted by Ian Dryden and Igor Chernayavsky).
	Fixed.

    o   plot.owin, plot.ppp
	   	Display of binary masks was garbled if the window was 
	empty or if it was equivalent to a rectangle.
	Fixed.

    o   plot.bermantest
	   	One of the vertical lines for the Z1 test was in the wrong place.
	Fixed.

    o   marks<-.ppx
	   	Crashed in some cases.
	Fixed.

    o   is.convex
	   	An irrelevant warning was issued (for non-convex polygons).
	Fixed.

                 Changes in version 1.21-1 (2010-11-11)                 

OVERVIEW 

    o   Confidence intervals for K-function and other statistics

    o   Bug fixes for smoothing and relative risk estimation

NEW FUNCTIONS

    o   varblock
	   	Variance estimation (and confidence intervals)
	for summary statistics such as Kest, using subdivision technique

    o   bw.stoyan
	   	Bandwidth selection by Stoyan's rule of thumb.

    o   which.max.im
	    	Applied to a list of images, this determines which image
	has the largest value at each pixel.

    o   as.array.im
	   	Convert image to array

SIGNIFICANT USER-VISIBLE CHANGES

    o   smooth.ppp, markmean, sharpen.ppp, relrisk, bw.relrisk
	   	Further acceleration achieved.

    o   Kest
	   	Argument 'correction' now explicitly overrides automatic defaults

    o   plot.fv
	   	More robust handling of 'shade'

BUG FIXES

    o   relrisk
	   	Format of relrisk(at="points") was incorrect.
	Fixed.

    o   bw.relrisk
	   	Result was incorrect in the default case method="likelihood"
	because of previous bug.
	Fixed.

    o   Jdot, Jcross, Jmulti
	   	Return value did not include the hazard function, when correction="km"
	Fixed.

    o   Jdot, Jcross, Jmulti
	   	Format of output was incompatible with format of Jest.
	Fixed.

                 Changes in version 1.21-0 (2010-11-05)                 

OVERVIEW 

    o   Implemented Spatial Logistic Regression

    o   Implemented nonparametric estimation of relative risk
	       with bandwidth selection by cross-validation.

    o   Smoothing functions can handle a data frame of marks.

    o   New options in Kinhom; default behaviour has changed.

NEW FUNCTIONS

    o   slrm
	   	Fit a spatial logistic regression model

    o   anova.slrm, coef.slrm, fitted.slrm, logLik.slrm, plot.slrm, predict.slrm
	   	Methods for spatial logistic regression models

    o   relrisk
	   	Nonparametric estimation of relative risk 

    o   bw.relrisk
	   	Automatic bandwidth selection by cross-validation

    o   default.rmhcontrol
	       Sets default values of Metropolis-Hastings parameters

SIGNIFICANT USER-VISIBLE CHANGES

    o   smooth.ppp, markmean
	   	These functions now accept a data frame of marks.

    o   Kinhom
	Default behaviour has changed. 
	   	New argument 'renormalise=TRUE' determines scaling of estimator
	and affects bias and variance in small samples.

    o   residuals.ppm
	   	Now also computes the score residuals.

    o   plot.im
	   	New argument 'ribscale'

    o   plot.listof, plot.splitppp
	   	New arguments panel.begin, panel.end and panel.args

    o   ppp
	   	Now checks for NA/NaN/Inf values in the coordinates

    o   envelope.ppm
	   	Changed default value of 'control' 
	   	New argument 'nrep'

    o   qqplot.ppm
	   	Changed default value of 'control' 

BUG FIXES

    o   marks<-.ppp, setmarks, %mark%
	   	A matrix of marks was accepted by ppp() 
	but not by these assignment functions. 
	Fixed.

    o   density.ppp, smooth.ppp, sharpen.ppp, markmean
	   	Crashed if the bandwidth was extremely small.
	Fixed.

                 Changes in version 1.20-5 (2010-10-25)                 

OVERVIEW 

    o   Accelerated computations of kernel smoothing.

    o   Implemented Choi-Hall data sharpening.

NEW FUNCTIONS

    o   sharpen.ppp
	   	Performs Choi-Hall data sharpening of a point pattern

SIGNIFICANT USER-VISIBLE CHANGES

    o   density.ppp, smooth.ppp
	   	Computation has been vastly accelerated 
	for density(X, at="points") and smooth.ppp(X, at="points")

    o   Kinhom
	   	Accelerated in case where lambda=NULL

    o   Vignette 'shapefiles' updated

                       Changes in version 1.20-4                        

OVERVIEW

    o   New functions for inhomogeneous point patterns
	   	and local analysis.

    o   Pair correlation function for 3D point patterns

    o   Minor improvements and bug fixes to simulation code and image functions

NEW FUNCTIONS

    o   pcf3est
	   	Pair correlation function for 3D point patterns.

    o   Kscaled, Lscaled
	Estimator of the template K function (and L-function)
	for a locally-scaled point process.

    o   localpcf
	       Local version of pair correlation function

    o   identify.psp
	   	Method for 'identify' for line segment patterns.

    o   as.im.matrix
	   	Converts a matrix to a pixel image

SIGNIFICANT USER-VISIBLE CHANGES

    o   rMaternI, rMaternII
	New argument 'stationary=TRUE' controls whether the 
	simulated process is stationary (inside the simulation window).
	Default simulation behaviour has changed.

    o   im
	       New arguments 'xrange', 'yrange' 

    o   envelope
	Improvements to robustness of code.

BUG FIXES

    o   quadratcount
	  	If V was a tessellation created using a factor-valued image,
	quadratcount(X, tess=V) crashed with the error
	"Tessellation does not contain all the points of X".
	Fixed.

    o   [.im
	  	If Z was a factor valued image and X was a point pattern
	then Z[X] was not a factor.
	Fixed.

                 Changes in version 1.20-3 (2010-08-24)                 

OVERVIEW

    o   minor improvements (mostly internal).

NEW FUNCTIONS

    o   unmark.ppx
	   	Method for 'unmark' for general space-time point patterns

SIGNIFICANT USER-VISIBLE CHANGES

    o   plot.ppx
	   	Now handles marked patterns, in two-dimensional case

    o   as.psp.psp
	   	Default value of argument 'check' set to FALSE

                 Changes in version 1.20-2 (2010-08-10)                 

OVERVIEW

    o   Extensions to minimum contrast estimation.

    o   Bug fix in simulation of Lennard-Jones model.

    o   More support for distance functions.

    o   Changes to point process simulations.

NEW FUNCTIONS

    o   thomas.estpcf
	   	Fit Thomas process model by minimum contrast using the
	pair correlation function (instead of the K-function).

    o   matclust.estpcf
	   	Fit Matern Cluster model by minimum contrast using the
	pair correlation function (instead of the K-function).

    o   lgcp.estpcf
	   	Fit log-Gaussian Cox process model by minimum contrast using the
	pair correlation function (instead of the K-function).

    o   contour.distfun,  persp.distfun
	   	Methods for 'contour' and 'persp' for distance functions

    o   default.expand
	       Computes default window for simulation of a fitted point process model.

SIGNIFICANT USER-VISIBLE CHANGES

    o   kppm
	   	Models can now be fitted using either the K-function
	or the pair correlation function.

    o   ppm
	   	The list of covariates can now include windows 
	(objects of class 'owin'). A window will be treated
	as a logical covariate that equals TRUE inside the window
	and FALSE outside it.

    o   plot.distfun
	   	Pixel resolution can now be controlled.

    o   envelope.ppm, qqplot.ppm
	   	The default value of 'control' has changed;
	simulation results may be slightly different.

    o   rmh
	   	Slightly accelerated.

BUG FIXES

    o   rmh
	   	Simulation of the Lennard-Jones model (cif = 'lennard') was incorrect
	due to an obscure bug, introduced in spatstat 1.20-1.
	Fixed.

    o   thomas.estK, matclust.estK, lgcp.estK
	   	The value of 'lambda' (if given) 
	was ignored if X was a point pattern.
	Fixed.

                 Changes in version 1.20-1 (2010-07-26)                 

OVERVIEW

    o   Further increases in speed and efficiency of ppm and rmh

    o   New pairwise interaction model 

NEW FUNCTIONS

    o   DiggleGatesStibbard
	   	Diggle-Gates-Stibbard pairwise interaction for use in ppm()

SIGNIFICANT USER-VISIBLE CHANGES

    o   ppm
	   	has been accelerated by a factor of 10 for the BadGey interaction.

    o   rmh
	   	simulation of the Lennard-Jones model (cif='lennard')
	has been greatly accelerated.

    o   rmh, rmhmodel.ppm
	   	Point process models fitted by ppm() using the DiggleGatesStibbard
	interaction can be simulated automatically using rmh.

BUG FIXES

    o   fitin
	   	The plot of a fitted Hardcore interaction was incorrect.
	Fixed.

                       Changes in version 1.20-0                        

OVERVIEW

    o   spatstat now contains over 1000 functions.

    o   Substantial increase in speed and efficiency 
	       of model-fitting code.

    o   Changes to factor-valued images.

SIGNIFICANT USER-VISIBLE CHANGES

    o   ppm
	has been accelerated by a factor of 10,
	       and can handle datasets with 20,000 points,
	       for the following interactions: 
	DiggleGratton, Fiksel, Geyer, Hardcore, Strauss, StraussHard

    o   predict.ppm 
	       accelerated by a factor of 3 (when type = "cif")
	with vastly reduced memory requirements
	for the following interactions: 
	DiggleGratton, Fiksel, Geyer, Hardcore, Strauss, StraussHard

    o   pixel images (class "im")
	   	The internal representation of factor-valued images has changed.
	Existing objects in the old format should still work.

    o   im
	The syntax for creating a factor-valued image has changed.
	   	Argument 'lev' has been deleted.

    o   ppm 
	   	Some warnings have been reworded for greater clarity.

BUG FIXES

    o   [.im
	   	Mishandled some factor-valued images.
	Fixed.

    o   hist.im
	   	Produced slightly erroneous output for some factor-valued images.
	Fixed.

    o   plot.owin
	   	Filled polygons appeared to contain criss-cross lines
	on some graphics drivers.
	Fixed.

    o   deltametric
	   	Did not handle windows with different enclosing frames
	(error message: 'dA and dB are incompatible')
	Fixed.

    o   quadratcount
	   	Crashed if the pattern was empty and the window was a rectangle.
	(Noticed by Sandro Azaele)
	Fixed.

    o   rNeymanScott
	   	Crashed if the parent process realisation was empty.
	(Noticed by Sandro Azaele)
	Fixed.

                 Changes in version 1.19-3 (2010-06-17)                 

ACKNOWLEDGEMENTS

    o   We thank David Dereudre for contributions.    

OVERVIEW

    o   Urgent bug fix to Metropolis-Hastings for Lennard-Jones model.

    o   Miscellaneous additions to plotting and colour management.

NEW FUNCTIONS

    o   col2hex, rgb2hex, paletteindex, samecolour
	   	Functions for converting and comparing colours.

    o   plot.envelope
	New method for plotting envelopes.
	By default the area between the upper and lower envelopes
	is shaded in grey.

SIGNIFICANT USER-VISIBLE CHANGES

    o   plot.fasp
	If the entries in the array are envelopes,
	they are plotted using plot.envelope
	(hence the envelope region is shaded grey).

    o   plot.fv
	       Now displays mathematical notation for each curve,
	if legendmath=TRUE.

    o   print.fv
	Now prints the available range of 'r' values
	as well as the recommended range of 'r' values.

BUG FIXES

    o   rmh
	       Simulation of Lennard-Jones model was incorrect;
	the simulations were effectively Poisson patterns.
	(Spotted by David Dereudre.)
	Fixed.

    o   plot.fv
	Did not correctly handle formulas that included I( )
	Fixed.

                 Changes in version 1.19-2 (2010-06-09)                 

ACKNOWLEDGEMENTS

    o   We thank Jorge Mateu, Michael Sumner and Sebastian Luque
	       for contributions.    

OVERVIEW

    o   More support for fitted point process models and pixel images.

    o   Improved plotting of pixel images and envelopes.

    o   Simulation algorithm for Lennard-Jones process.

    o   Improvements and bug fixes to envelopes. 

    o   Bug fixes to Metropolis-Hastings simulation.

NEW FUNCTIONS

    o   pairs.im
	   	Creates a scatterplot matrix for several pixel images.

    o   model.frame.ppm
	   	Method for 'model.frame' for point process models.

    o   sort.im
	       Method for 'sort' for pixel images.

SIGNIFICANT USER-VISIBLE CHANGES

    o   plot.fv, plot.fasp
		New argument 'shade' enables confidence intervals
	       or significance bands to be displayed as filled grey shading.

    o   LennardJones
	   	The parametrisation of this interaction function has been changed.

    o   rmh, rmhmodel
	       These functions will now simulate a point process model
	that was fitted using the LennardJones() interaction.

    o   rmh.default, rmhmodel.default
	   	These functions will now simulate a point process model
	with the Lennard-Jones interaction (cif='lennard').

    o   ecdf
	   	This function now works for pixel images.

    o   dim, row, col
	       These functions now work for pixel images.

    o   order
	   	This function now works for pixel images.

    o   [.im and [<-.im 
	   	The subset index can now be any valid subset index for a matrix.

    o   density.ppp, smooth.ppp
	   	The return value now has attributes 'sigma' and 'varcov'
	reporting the smoothing bandwidth.

    o   plot.im
	       The argument 'col' can now be a 'colourmap' object.
	       This makes it possible to specify a fixed mapping between
	numbers and colours (e.g. so that it is consistent between
	plots of several different images).

    o   rmh, spatstat.options
	   	spatstat.options now recognises the parameter 'expand' 
	which determines the default window expansion factor in rmh.

    o   rmh
	   	Improved handling of ppm objects with covariates.

    o   kstest
	       The 'covariate' can now be one of the characters "x" or "y"
	indicating the Cartesian coordinates.

BUG FIXES

    o   model.matrix.ppm
	   	For a fitted model that used a large number of quadrature points,
	model.matrix.ppm sometimes reported an internal error about mismatch
	between the model matrix and the quadrature scheme.
	Fixed.

    o   plot.ppx
	   	Minor bugs fixed.

    o   rmh
	   	In rare cases, the simulated point pattern 
	included multiple points at the origin (0,0).
	(Bug introduced in spatstat 1.17-0.)
	Fixed.

    o   rmh, rmhmodel.ppm
	   	Crashed when applied to a fitted multitype point process model
	if the model involved more than one covariate image.
	(Spotted by Jorge Mateu)
	Fixed.

    o   density.psp
	   	If any segment had zero length, the result contained NaN values.
	(Spotted by Michael Sumner and Sebastian Luque.)
	Fixed.

    o   envelope
	   	Crashed with fun=Lest or fun=Linhom if the number of points in 
	a simulated pattern exceeded 3000.
	Fixed.

    o   plot.kstest
	   	Main title was corrupted if the covariate was a function.
	Fixed.

                 Changes in version 1.19-1 (2010-05-25)                 

OVERVIEW

    o   New dataset: replicated 3D point patterns. 

    o   Improvements to Metropolis-Hastings simulation code.

    o   More support for hyperframes. 

    o   Bug fixes.

NEW DATASETS

    o   osteo:
	      Osteocyte Lacunae data: replicated 3D point patterns

NEW FUNCTIONS

    o   rbind.hyperframe:
	      Method for rbind for hyperframes.

    o   as.data.frame.hyperframe:
	      Converts a hyperframe to a data frame.

SIGNIFICANT USER-VISIBLE CHANGES

    o   Fiksel:
	      Fitted point process models (class ppm) with the Fiksel()
	      double exponential interaction can now be simulated by rmh.

    o   rmh.default: 
	      Point processes with the Fiksel interaction can now be
	      simulated by specifying parameters in rmh.default.

    o   logLik.ppm:
	       New argument 'warn' controls warnings.

    o   profilepl:
	       No longer issues spurious warnings.

BUG FIXES

    o   Hardcore, rmh:
	   	Simulation of the 'Hardcore' process was incorrect.
	The hard core radius was erroneously set to zero 
	so that the simulated patterns were Poisson.
	Fixed.

    o   fitin:
	       A plot of the pairwise interaction function of a fitted model,
	generated by plot(fitin(model)) where model <- ppm(...), 
	was sometimes incorrect when the model included a hard core.
	Fixed.

                 Changes in version 1.19-0 (2010-05-16)                 

OVERVIEW

    o   Numerous bugs fixed in the implementation of
	   	the Huang-Ogata approximate maximum likelihood method.

    o   New interpoint interaction model.

NEW FUNCTIONS

    o   Fiksel: 
	       new interpoint interaction: Fiksel's double exponential model.

SIGNIFICANT USER-VISIBLE CHANGES

    o   runifpoint, rpoispp, envelope
	   	These functions now issue a warning if the number of random points
	to be generated is very large. This traps a common error in
	simulation experiments.

BUG FIXES

    o   predict.ppm, fitted.ppm:
	       Predictions and fitted values were incorrect for 
	objects fitted using ppm(..., method="ho").
	Fixed.

    o   logLik, AIC:
	       Values of logLik() and AIC() were incorrect for 
	   	objects fitted using ppm(..., method="ho").
	Fixed.

    o   profilepl:
	   	Results were incorrect if the argument 'method="ho"' was used.
	Fixed.

    o   fitin
	       The result of fitin() was incorrect for 
	   	objects fitted using ppm(..., method="ho").
	Fixed.

    o   rmhcontrol: 
	   	rmhcontrol(NULL) generated an error.
	Fixed.

                 Changes in version 1.18-4 (2010-05-02)                 

ACKNOWLEDGEMENTS

    o   We thank Michael Sumner for contributions.    

BUG FIXES

    o   pixellate.psp: segments shorter than one pixel width
	   	were measured incorrectly if the 'weights' argument was present. 
	Fixed.

NEW FUNCTIONS

    o   pairdist.ppx, crossdist.ppx, nndist.ppx, nnwhich.ppx:
	   	Methods for pairdist, crossdist, nndist, nnwhich 
	for multidimensional point patterns (class 'ppx')

    o   runifpointx, rpoisppx:
	Random point patterns in any number of dimensions

    o   boxx:
	Multidimensional box in any number of dimensions

    o   diameter.boxx, volume.boxx, shortside.boxx, eroded.volumes.boxx:
	       Geometrical computations for multidimensional boxes

    o   sum.im, max.im, min.im: 
	       Methods for sum(), min(), max() for pixel images.

    o   as.matrix.ppx:
	Convert a multidimensional point pattern to a matrix

SIGNIFICANT USER-VISIBLE CHANGES

    o   plot.ppp: New argument 'zap'

    o   diameter: This function is now generic, 
	       with methods for "owin", "box3" and "boxx"

    o   eroded.volumes: This function is now generic, 
	       with methods for "box3" and "boxx"

                 Changes in version 1.18-3 (2010-04-19)                 

ACKNOWLEDGEMENTS

    o   We thank Michael Sumner for contributions.    

BUG FIXES

    o   pixellate.psp: segments shorter than one pixel width
	   	were measured incorrectly. Fixed.

    o   fv: 'alim' not handled correctly.  Fixed.

NEW FUNCTIONS

    o   smooth.fv:
	       Applies spline smoothing to the columns of an fv object.

                 Changes in version 1.18-2 (2010-04-10)                 

ACKNOWLEDGEMENTS

    o   We thank Michael Sumner for contributions.    

NEW FUNCTIONS

    o   Gfox, Jfox:
	       Foxall's G and J functions

    o   as.owin.distfun: 
	       New method for as.owin extracts the domain of a distfun object.

SIGNIFICANT USER-VISIBLE CHANGES

    o   distfun: objects of class 'distfun', when called as functions,
	       will now accept either two vectors (x,y) or a point pattern x.

    o   Hest: this function can now compute the	Hanisch estimator. 
	       It now has arguments 'r', 'breaks' and 'correction', 
	like other summary functions. 

    o   Hest: new argument 'conditional'.

BUG FIXES

    o   pixellate.psp: Values were sometimes incorrect due to coding error.
	   	(Spotted by Michael Sumner)
	       Fixed.

    o   kstest: Crashed if the covariate contained NA's.
	Fixed.

    o   kstest: Crashed if X was a multitype point pattern 
	in which some mark values were unrepresented.
	Fixed.

    o   lurking: Minor bug in handling of NA values.
	   	Fixed.

    o   Hest: labels of columns were incorrect. 
	       Fixed.

                 Changes in version 1.18-1 (2010-03-19)                 

ACKNOWLEDGEMENTS

    o   we thank Andrew Bevan and Ege Rubak for suggestions.

NEW FUNCTIONS

    o   Hardcore: Hard core interaction (for use in ppm)

    o   envelope.pp3: simulation envelopes for 3D point patterns

    o   npoints: number of points in a point pattern of any kind

SIGNIFICANT USER-VISIBLE CHANGES

    o   rmh.ppm, rmhmodel.ppm:
	   	It is now possible to simulate Gibbs point process models
	that are fitted to multitype point patterns using a
	non-multitype interaction, e.g.
	    data(amacrine)
	    fit <- ppm(amacrine, ~marks, Strauss(0.1))
	    rmh(fit, ...)

    o   rmh.ppm, rmhmodel.ppm, rmh.default, rmhmodel.default:
	   	Hard core models can be simulated.

    o   rmh.default, rmhmodel.default:
	  	The argument 'par' is now required to be a list, in all cases
	(previously it was sometimes a list and sometimes a vector).

    o   Fest:
	       Calculation has been accelerated in some cases.

    o   summary.pp3 now returns an object of class 'summary.pp3'
	   	containing useful summary information. It is plotted by
	'plot.summary.pp3'.

    o   F3est, G3est, K3est: these functions now accept 
	       'correction="best"' 

    o   union.owin, intersect.owin: 
	   	these functions now handle any number of windows.

    o   envelope.ppp, envelope.ppm, envelope.kppm: 
	       argument lists have changed slightly

BUG FIXES

    o   Fest: The result of Fest(X, correction="rs") had a slightly
	   	corrupted format, so that envelope(X, Fest, correction="rs")
	in fact computed the envelopes based on the "km" correction.
	(Spotted by Ege Rubak).
	Fixed.

    o   rmh (rmh.ppm, rmhmodel.ppm):
	rmh sometimes failed for non-stationary point process models,
	with a message about "missing value where TRUE/FALSE needed".
	(Spotted by Andrew Bevan).
	Fixed.

    o   diagnose.ppm, lurking:
	       Calculations were not always correct if the model
	had conditional intensity equal to zero at some locations.
	Fixed.

    o   ppm, profilepl:
	       If data points are illegal under the model (i.e. if any
	       data points have conditional intensity equal to zero)
	       the log pseudolikelihood should be -Inf but was sometimes
	returned as a finite value. Thus profilepl did not always 
	work correctly for models with a hard core.
	Fixed.

    o   F3est, G3est: 
	   	Debug messages were printed unnecessarily.
	Fixed.

                 Changes in version 1.18-0 (2010-03-10)                 

ACKNOWLEDGEMENTS

    o   we thank Ege Rubak and Tyler Dean Rudolph for suggestions.

HEADLINES

    o   A point pattern is now allowed to have a data frame of marks
	       (previously the marks had to be a vector).

    o   Extended capabilities for 'envelope' and 'kstest'.

NEW FUNCTIONS

    o   pixellate.psp,  as.mask.psp
	   	Convert a line segment pattern to a pixel image or binary mask

    o   as.data.frame.im
	       Convert a pixel image to a data frame

SIGNIFICANT USER-VISIBLE CHANGES

    o   A point pattern is now allowed to have a data frame of marks
	       (previously the marks had to be a vector).

    o   Many functions in spatstat now handle point patterns with 
	       a data frame of marks. 
	These include print.ppp, summary.ppp, plot.ppp, split.ppp.

    o   finpines, nbfires, shapley:
	       The format of these datasets has changed. 
	       They are now point patterns with a data frame of marks.

    o   envelope() is now generic, with methods for "ppp", "ppm" and "kppm".

    o   kstest() now handles multitype point patterns and 
	       multitype point process models.

    o   nnclean() now returns a point pattern with a data frame of marks.

    o   plot.ppp() has new argument 'which.marks' to select one column
	       from a data frame of marks to be plotted. 

    o   plot.ppp() now handles marks that are POSIX times.

    o   complement.owin now handles any object acceptable to as.owin.

BUG FIXES

    o   erosion(w) and opening(w) crashed if w was not a window.
	       Fixed.

    o   diameter() and eroded.areas() refused to work if w was not a window.
	       Fixed.

                 Changes in version 1.17-6 (2010-02-09)                 

ACKNOWLEDGEMENTS

    o   We thank Simon Byers and Adrian Raftery for generous contributions.

OVERVIEW

    o   Nearest neighbour clutter removal algorithm

    o   New documentation for the 'fv' class.

    o   Minor improvements and bug fixes.

NEW FUNCTIONS

    o   nnclean: Nearest neighbour clutter removal for recognising features 
	in spatial point patterns. Technique of Byers and Raftery (1998) 
	[From original code by Simon Byers and Adrian Raftery,
	adapted for spatstat.]

    o   marks.ppx, marks<-.ppx: Methods for extracting and changing marks
	in a multidimensional point pattern

    o   latest.news: print news about the current version of the package

SIGNIFICANT USER-VISIBLE CHANGES

    o   news: spatstat now has a NEWS file which can be printed by
	typing news(package="spatstat").

    o   areaGain, areaLoss: New algorithms in case exact=TRUE.
	Syntax slightly modified.

    o   with.hyperframe: 
		- The result now inherits 'names' from the row names
		of the hyperframe. 
		- New argument 'enclos' controls the environment
		in which the expression is evaluated.
		- The algorithm is now smarter at simplifying the result
		when simplify=TRUE.

    o   update.ppm: Tweaked to improve the ability of ppm objects
	to be re-fitted in different contexts.

ADVANCED USERS ONLY

    o   Documentation for the class 'fv' of function value tables
	- fv: Creates an object of class 'fv' 
	- cbind.fv, collapse.fv: Combine objects of class 'fv'		
	- bind.fv: Add additional columns of data to an 'fv' object

BUG FIXES

    o   "$<-.hyperframe" destroyed the row names of the hyperframe.
	Fixed.	

    o   model.matrix.ppm had minor inconsistencies.
	Fixed.		

    o   ppm: The fitted coefficient vector had incorrect format
	in the default case of a uniform Poisson process. 
	Fixed.

    o   plot.ppx: Crashed if the argument 'main' was given.
	Fixed.

    o   envelope.ppp: Crashed if the object returned by 'fun' 
	   	did not include a column called "theo".
	   	Fixed.
