RELEASE NOTES 

		spatstat 1.18-1

		19 march 2010

We thank Andrew Bevan and Ege Rubak for contributions.
	
OVERVIEW
	New 'hard core' interaction. 
	Envelopes for 3D point patterns.
	Extended functionality for rmh.
	Bug fixes.

NEW FUNCTIONS

	Hardcore
		Hard core interaction (for use in ppm).

	envelope.pp3
		Simulation envelopes for 3D point patterns

	npoints
		Number of points in a point pattern of any kind.

IMPROVEMENTS/ENHANCEMENTS

	rmh.ppm, rmhmodel.ppm
	rmh.default, rmhmodel.default
		 Hard core models can be simulated

	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, ...)

	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).

	Fest
		Computation of 'envelope(X, Fest, ...)' has been accelerated.

	summary.pp3 
		 now returns an object of class 'summary.pp3'
		 containing useful summary information. It is plotted by
		 'plot.summary.pp3'.

        intersect.owin, union.owin
		These functions now handle any number of windows.

   	F3est, G3est, K3est
	       These functions now accept 'correction="best"' 

    	envelope.ppp, envelope.ppm, envelope.kppm
	        Argument lists have changed slightly

BUGS

	[1] 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.


	[2] rmh (rmh.ppm, rmhmodel.ppm)
	        On some systems and some versions of R, 
		rmh failed for non-stationary point process models,
		with a message about "missing value where TRUE/FALSE needed".
		(Spotted by Andrew Bevan).
		Fixed.

	[3] diagnose.ppm, lurking
	        Calculations were not always correct if the model
		had conditional intensity equal to zero at some locations.
		Fixed.

	[4] 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. Consequently, profilepl() 
		 did not always work correctly for models with a hard core.
		 Fixed.
		 
        [5] F3est, G3est
	         Debug messages were printed unnecessarily.
		 Fixed.