Etienne Bellemare [email protected]<mailto:[email protected]> writes:
> When using erode.owin from spatstat package, you can specify to keep the
> window extent (shrink.frame=FALSE). But, with dilate.owin, you cannot use
> shrink.frame. What can I use to keep the same extent ?
This question refers to the 'frame' or 'bounding rectangle' of a window (object
of class "owin" in spatstat). You can find the bounding rectangle of a window
using as.rectangle() or by extracting the $xrange and $yrange entries of the
window.
In principle you can't keep the same bounding rectangle when you dilate a
window, because the dilation could be larger than this rectangle.
However, you can manipulate the bounding rectangle of a window using
w <- rebound.owin(w, rect)
where 'rect' is a rectangular window e.g. rect=owin(xrange, yrange).
This will generate an error if 'rect' does not contain 'w'.
Adrian Baddeley
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