RELEASE NOTES 

		spatstat 1.11-4

		16 april 07
	
OVERVIEW

	spatstat now requires R version 2.4.0 or higher.

	It is now possible to plot the pairwise interaction function
	in a fitted point process model. 

	Minor improvements and bug fixes.


NEW FUNCTIONS

	fitin
		Extracts the fitted interpoint interaction
		from a fitted point process model. 
		The interaction can then be plotted:
			model <- ppm(.....)
			plot(fitin(model))

	nndist.psp
		Method for 'nndist' for line segment patterns.

IMPROVEMENTS/ENHANCEMENTS

	nndist
	nnwhich
		These functions now have an argument 'k=1' 
		and compute the k-th nearest neighbour distance
		or find the k-th nearest neighbour.

	pairdist.ppp
	pairdist.default
		These functions now have an argument `squared=FALSE'.
		If squared=TRUE, the squared distances are returned instead.

	ppm
		The format of objects of class "ppm" has changed 
		so that they occupy less memory.
		There should be no incompatibility problems. 

	predict.ppm
		When the return value is a list, it is now also
		of class "listof" so that it can be plotted immediately.

	vcov.ppm
		Computation accelerated. 
		More robust against numerical errors.

	ks.test.ppm
		The return value of this function can now be plotted
		(which displays the two cumulative distribution functions).

	update.ppm
		New argument `envir' determines the environment
		in which the call to ppm will be re-evaluated.


BUGS

	[1] lurking, diagnose.ppm
		In extreme situations (e.g. when the data pattern is empty), 
		the Fisher information matrix of the fitted model
		can be singular. These functions would then crash with a 
		message about inverting an exactly singular matrix.
		Fixed.

	[2] ks.test.ppm
		Distribution function of the covariate was calculated
		incorrectly at the two extreme ends.
		(Unlikely to have affected the p-value greatly).
		Fixed.

	[3] anova.ppm
		Crashed in some cases with an error message from "mpl.engine".
		Fixed.

	[4] demo(data)
		Error in use of `copper' dataset.
		Fixed.