RELEASE NOTES 

		spatstat 1.9-3

	 	21 June 2006

OVERVIEW

	Increased capabilities for handling polygonal windows
	(including K functions with Ripley's edge correction,
	and line segment clipping to polygons).

	Increased speed of various operations.
	
NEW FUNCTIONS

	levels
		For a factor-valued image x, the factor levels
		can now be extracted by 
			levels(x) 
		and reassigned by
			levels(x) <- newvalue

	class for quadrat counts
		The return value from quadratcount() is now an object 
		of class "quadratcount" for which there are special
		methods for print and plot. See help(quadratcount).

	class for count-based chi-squared tests
		The return value from quadrat.test() is now an object 
		of class c("quadrattest", "htest"). There is a special
		plot method for class "quadrattest". The R system already
		has a print method for class "htest".

IMPROVEMENTS/ENHANCEMENTS

	Kest, Kinhom, Kcross, Kdot, Kmulti, 
	Kmulti.inhom, Kcross.inhom, Kdot.inhom,
	markcorr
		Ripley's isotropic edge correction
		has been implemented for polygonal windows.

	ppm
		Accelerated in case method="ho".

	qqplot.ppm
		Accelerated.

	envelope
		Accelerated, when simulation is based on
		a fitted point process model.

	profilepl
		Accelerated slightly.

	"[.psp"
		Line segments can now be clipped to a polygonal window

	rpoisline
		Now works for a polygonal window.

	complement.owin
		New argument 'frame'.

	plot.fv
		Now handles the case where 'ylab' is an expression.
	
	plot.owin
		Handling of colours and line widths improved.

	plot.splitppp
		Layout improved. Main heading now displayed.
		New argument 'main'.

	plot.psp
		New argument 'add'.

	plot.profilepl
	plot.minconfit
		Minor improvements to layout.

	persp.im
		Minor improvements in behaviour

	print.im
		Minor improvements in case of a factor image.

	allstats
		Now has "..." argument which can be used to
		control the functions Fest, Gest etc.

	data(chorley)
		Boundary polygon data have been corrected slightly.

	levels()
		The standard R function levels() can now also extract the
		levels of a factor-valued image.

	documentation
		Various help files improved.

WARNINGS

	Kest, Kinhom, Kcross, Kdot, Kmulti, 
	Kmulti.inhom, Kcross.inhom, Kdot.inhom,
	markcorr
		Default vector of r values changed.


	ppm
		Argument sequence altered (does not affect 
		the most important arguments)


BUGS

	[1] Gcross, Gdot, Gmulti, alltypes(.., fun="G")
		These functions would sometimes crash, with an obscure 
		error report about unequal dimensions of two vectors.
		Fixed.

	[2] rpoisline 
		Produced incorrect output in some cases
		(lines were clipped to the wrong window).
		Fixed.