Spatstat

analysing spatial point patterns

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RELEASE NOTES

spatstat 1.49-0

08 February 2017

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

OVERVIEW

• spatstat now ‘Suggests’ the package ‘fftwtools’.

• Operations on signed measures.

• Operations on lists of pixel images.

• Improved pixellation of point patterns.

• Stieltjes integral extended.

• Subset operators extended.

• Greatly accelerated ‘rmh’ when using ‘nsave’

• Some computations accelerated.

• Size of namespace reduced, for efficiency.

• Bug fixes.

• Version nickname: ‘So-Called Software’

NEW DEPENDENCIES

• 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

• hexagon, regularpolygon
  Create regular polygons.

• Ops.msr
  Arithmetic operations for measures.

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

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

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

• as.function.ssf
  Convert an object of class ‘ssf’ to a function(x,y)

• as.function.leverage.ppm
  Convert an object of class ‘leverage.ppm’ to a function(x,y)

SIGNIFICANT USER-VISIBLE CHANGES

• stieltjes
  Argument ‘M’ can be a stepfun object (such as an empirical CDF).

• 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.

• pixellate.ppp
  New arguments ‘fractional’ and ‘preserve’ for more accurate discretisation.

• ”[.layered”
  Subset index i can now be an ‘owin’ object.

• ”[.solist”
  Subset index i can now be an ‘owin’ object.

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

• ppp
  New argument ‘checkdup’.

• Summary.im
  Argument ‘na.rm’ is no longer ignored.

• cdf.test
  The methods for classes ppp, ppm, lpp, lppm, slrm
  have a new argument ‘interpolate’.

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

• 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.

• polynom
  This function now has a help file.

• rmhcontrol
  New parameter ‘pstage’ determines when to generate random proposal points.

• rmh
  Accelerated, in the case where multiple patterns are saved using ‘nsave’.

• bdist.pixels
  Accelerated for polygonal windows. New argument ‘method’.

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

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

BUG FIXES

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

2. 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.

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

4. has.close.pp3
   Results were incorrect, or a crash occurred, when argument ‘Y’ was given.
   Fixed.

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

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

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

8. QQversion
   Plotting labels were malformed.
   Fixed.

Release notes are available in raw text format here.