Perimeter Length of Window

Description

Computes the perimeter length of a window

Usage

perimeter(w)

Arguments

Details

This function computes the perimeter (length of the boundary) of the window w. If w is a rectangle or a polygonal window, the perimeter is the sum of the lengths of the edges of w. If w is a mask, it is first converted to a polygonal window using as.polygonal, then staircase edges are removed using simplify.owin, and the perimeter of the resulting polygon is computed.

Value

A numeric value giving the perimeter length of the window.

Author(s)

Adrian Baddeley Adrian.Baddeley@csiro.au http://www.maths.uwa.edu.au/~adrian/ and Rolf Turner r.turner@auckland.ac.nz

See Also

area.owin diameter.owin, owin.object, as.owin

Examples

  perimeter(square(3))
  data(letterR)
  perimeter(letterR)
  if(spatstat.options("gpclib")) {
     if(interactive()) {
     print(perimeter(as.mask(letterR)))
    } else print(perimeter(as.mask(letterR, dimyx=32)))
  }