User 'rusers.sh' asks a question about the library 'spatstat':
> intersect.owin() works for intersection.
> Say polygon B located inside A. Is there any function in R for us to
> get the complement part of B in polygon A?
See complement.owin.
Try
Bcom <- complement.owin(B, frame=bounding.box(A))
AminB <- intersect.owin(A, Bcom)
If you want the answer to be a polygon, you'll need to set
spatstat.options(gpclib=TRUE), unless A is a rectangle.
Adrian Baddeley
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