RELEASE NOTES 

		spatstat 1.20-0

		16 July 2010
	
OVERVIEW

    Substantial increase in speed and efficiency of model-fitting code.
    Changes to factor-valued images.
    The spatstat package now contains over 1000 functions.


IMPROVEMENTS/ENHANCEMENTS

    ppm
	has been accelerated by a factor of 10,
        and can handle datasets with 20,000 points,
        for the following interactions: 
	DiggleGratton, Fiksel, Geyer, Hardcore, Strauss, StraussHard

    predict.ppm 
        has been accelerated by a factor of 3 (when type = "cif")
	with vastly reduced memory requirements
	for the following interactions: 
	DiggleGratton, Fiksel, Geyer, Hardcore, Strauss, StraussHard

    pixel images (class "im")
    	The internal representation of factor-valued images has changed.
	Existing objects in the old format should still work.

    im
	The syntax for creating a factor-valued image has changed.
    	Argument 'lev' has been deleted.

    ppm 
    	Some warnings have been reworded for greater clarity.

BUGS

    [1] [.im
    	Mishandled some factor-valued images.
	Fixed.

    [2] hist.im
    	Produced slightly erroneous output for some factor-valued images.
	Fixed.

    [3] plot.owin
    	Filled polygons appeared to contain criss-cross lines
	on some graphics drivers.
	Fixed.

    [4] deltametric
    	Did not handle windows with different enclosing frames
	(error message: 'dA and dB are incompatible')
	Fixed.

    [5] quadratcount
    	Crashed if the pattern was empty and the window was a rectangle.
	(Noticed by Sandro Azaele)
	Fixed.

    [6] rNeymanScott
    	Crashed if the parent process realisation was empty.
	(Noticed by Sandro Azaele)
	Fixed.