RELEASE NOTES 

		spatstat 1.15-4

		12 June 09
	
OVERVIEW
	Morphological operators are now implemented using polygonal geometry.
	Envelopes of K function are faster to compute.
	New algorithm for simplifying polygons.
	Bug fixes and minor improvements. 

NEW FUNCTIONS

	simplify.owin
		Given a polygonal window, this function finds a 
		simpler polygon (with fewer edges) that approximates it.

IMPROVEMENTS/ENHANCEMENTS

	envelope
		Computation of simulation envelopes has been accelerated
		by a factor of 2-3 for the K function and its relatives.

		If 'r' is given explicitly, the default value of 'ginterval'
		is now taken to be range(r).

	print.envelope
		The edge correction used to compute the envelopes
		is now indicated when an envelope object is printed.

	dilate.owin
	erode.owin
	closing.owin
	opening.owin
		These morphological operators now return a polygonal window
		(instead of a binary pixel mask) if the input is
		a rectangular or polygonal window.

	dilate.owin
		The boundary frame of the dilated window can now
		be controlled using the new argument 'tight'.

	Kest, Lest, Kinhom, Linhom, Kdot, Kcross, Ldot, Lcross, Kmulti, 
	Kdot.inhom, Kcross.inhom, Kmulti.inhom, pcf.ppp, localL, localK,
	markcorr, markvario, markconnect
		These functions now accept the option 'correction="best"'
		and compute the best edge correction available for the 
		type of data. 

BUGS

	[1] connected
		The pixel grid of the output image was incorrect:
		it was transposed (x and y axes were swapped).
		Fixed.

	[2] nearestsegment, project2segment
		Crashed if X contained exactly one point.
		Fixed.

	[3] [.im
		The subset operator "[.im" interpreted the 'raster' argument 
		incorrectly: it transposed the x and y dimensions.
		Fixed.

	[4] model.matrix.ppm
		Sometimes crashed with a message about an `internal error'.
		Fixed.