spatstat (version 1.20-2)

perimeter: Perimeter Length of Window

Description

Computes the perimeter length of a window

Usage

perimeter(w)

Arguments

w

A window (object of class "owin") or data that can be converted to a window by as.owin.

Value

• A numeric value giving the perimeter length of the window.

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.

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)))
  }