RELEASE NOTES 

		spatstat 1.16-1

		27 july 2009

	We thank Lin Yiching and Juanita Choo for suggestions.
	
OVERVIEW
	New geometrical operations. 
	Extensions to cluster model fitting and simulation code.
	Variance approximations for Kest.  
	Several minor improvements.	

NEW FUNCTIONS

	as.polygonal
		Converts any window to a polygonal window.

	perimeter
		Computes the perimeter length of a window.

	bermantest
		Berman's tests for dependence of a point pattern
		on a spatial covariate 

	erosion, dilation,
	opening, closing
		These morphological operations are now generic,
		with methods for 'owin', `ppp' and 'psp'.

	simulate.ppm
		A method for 'simulate' for the class 'ppm'.
		(essentially a wrapper for rmh.ppm)

IMPROVEMENTS/ENHANCEMENTS

	envelope
		Now accepts cluster point process models:
		the argument Y can now be an object of class 'kppm'.
		(Requested by Juanita Choo)

	Kest
		Now computes variance approximations
		(the Ripley and Lotwick-Silverman approximations to the 
		variance of Kest(X) assuming complete spatial randomness)

	kppm
	thomas.estK
	matclust.estK
	lgcp.estK
	mincontrast
		These functions now accept "..." arguments 
		and pass them to optim(). This allows the user
		to control the optimisation algorithm (in particular
		it is possible to constrain the parameter space).
		(Suggested by Lin Yiching)

	envelope
		New argument 'savepatterns' allows the 
		simulated point patterns to be saved. 
		Old argument 'saveall' has been renamed 'savefuns'.

	effectfun
		This function is now more robust against user errors
		and gives more explicit error messages.

	plot.kstest
		This function has been accelerated, by pre-computing
		some of the data in kstest().

	plot.fv
		Improved axis labels and legend.

	"owin" class
		A window is now permitted to be empty.
		This is represented either as a polygonal window
		with an empty list of coordinates, or as a binary mask 
		in which all pixel values are FALSE.

		Empty windows are now returned by various functions
		such as intersect.owin, complement.owin, solutionset,
		levelset, erosion.owin and opening.owin.
		
	simulate.kppm
		Has an extra argument 'seed' controlling the
		state of the random number generator.

	[<-.im
		Improved behaviour when the subset index is a point pattern.

BUGS

	[1] blur
		The message "pixel values were NA, even after blurring"
		was sometimes given erroneously.
		Fixed.