complement.owin {spatstat} | R Documentation |
Take the set complement of a window, within its enclosing rectangle.
complement.owin(w)
w |
an object of class "owin" describing
a window of observation for a point pattern.
|
If w
is a rectangular window this produces an error.
Otherwise, it yields a window object (of class "owin"
,
see owin.object
) representing the set complement
of w
inside its enclosing rectangle. For polygonal windows
this is achieved by reversing the sign of each boundary polygon,
while for binary masks it is achieved by negating the pixel values.
Another object of class "owin"
representing the complement of the window, i.e. the inside
of the window becomes the outside.
Adrian Baddeley adrian@maths.uwa.edu.au http://www.maths.uwa.edu.au/~adrian/ and Rolf Turner rolf@math.unb.ca http://www.math.unb.ca/~rolf
# polygonal data(demopat) w <- demopat$window outside <- complement.owin(w) # mask w <- as.mask(demopat$window) outside <- complement.owin(w)