intersect.owin

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Intersection or Union of Two Windows

Yields the intersection or union of two windows.

Keywords
spatial, math
Usage
intersect.owin(A, B, ..., fatal=TRUE)
   union.owin(A,B, ...)
Arguments
A
A window object (see Details).
B
A window object.
...
Optional arguments passed to as.mask to control the discretisation, if required.
fatal
Logical. Determines what happens if the intersection is empty.
Details

The function intersect.owin computes the intersection between the two windows A and B, while union.owin computes their union.

The arguments A and B must be window objects (either objects of class "owin", or data that can be coerced to this class by as.owin).

If the intersection is empty, then if fatal=FALSE the result is NULL, while if fatal=TRUE an error occurs.

Value

  • A window (object of class "owin").

See Also

is.subset.owin, overlap.owin, bounding.box, owin.object

Aliases
  • intersect.owin
  • union.owin
Examples
# rectangles
   u <- unit.square()
   v <- owin(c(0.5,3.5), c(0.4,2.5))
# polygon
   data(letterR)
# mask
   m <- as.mask(letterR)

# two rectangles
   intersect.owin(u, v) 
   union.owin(u,v)

# polygon and rectangle
   intersect.owin(letterR, v)
   union.owin(letterR,v)

# mask and rectangle
   intersect.owin(m, v)
   union.owin(m,v)

# mask and polygon
   p <- rotate(v, 0.2)
   intersect.owin(m, p)
   union.owin(m,p)

# two polygons
   A <- letterR
   B <- rotate(letterR, 0.2)
   plot(bounding.box(A,B), main="intersection")
   w <- intersect.owin(A, B)
   plot(w, add=TRUE)
   plot(A, add=TRUE)
   plot(B, add=TRUE)

   plot(bounding.box(A,B), main="union")
   w <- union.owin(A,B)
   plot(w, add=TRUE)   
   plot(A, add=TRUE)
   plot(B, add=TRUE)
Documentation reproduced from package spatstat, version 1.16-3, License: GPL (>= 2)

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