The numerical value of the diameter of the window.
Details
This function computes the
diameter of a window of arbitrary shape,
i.e. the maximum distance between any two points
in the window.
The argument x should be a window (an object of class
"owin", see owin.object for details)
or can be given in any format acceptable to as.owin().
The function diameter is generic. This function is the
method for the class "owin".