RELEASE NOTES 

		spatstat 1.18-4

		2 may 2010
	
OVERVIEW
	New functionality for multi-dimensional space-time point patterns.
	Bug fixes and improvements.

NEW FUNCTIONS

        pairdist.ppx
	crossdist.ppx
	nndist.ppx
	nnwhich.ppx
		Methods for pairdist, crossdist, nndist, nnwhich 
		for multidimensional space-time point patterns (class 'ppx')

	runifpointx
	rpoisppx
		Random point patterns in any number of dimensions

	boxx
		Multidimensional box in any number of dimensions

	diameter.boxx, volume.boxx, eroded.volumes.boxx, shortside.boxx
		Geometrical computations for multidimensional box

	sum.im, max.im, min.im
		Methods for sum, max and min for pixel images.

	as.matrix.ppx
		Convert a multidimensional point pattern to a matrix

IMPROVEMENTS/ENHANCEMENTS

	plot.ppp
		New argument 'zap' controls the treatment of 
		numeric marks close to zero.

	diameter
		This function is now generic, with methods for 
		'owin', 'box3' and 'boxx'.

	eroded.volumes
		This function is now generic, with methods for 
		'owin', 'box3' and 'boxx'.

	plot.ppx
		Behaviour improved.


BUGS

	[1] pixellate.psp
	        Segments shorter than one pixel width were measured
		incorrectly if the 'weights' argument was used. 
		(Spotted by Michael Sumner).
		Fixed.