spatstat.geom (version 3.2-8)

fardist: Farthest Distance to Boundary of Window

Description

Computes the farthest distance from each pixel, or each data point, to the boundary of the window.

Usage

fardist(X, ...)
  # S3 method for owin
fardist(X, ..., squared=FALSE)
  # S3 method for ppp
fardist(X, ..., squared=FALSE)

Value

For fardist.owin, a pixel image (object of class "im").

For fardist.ppp, a numeric vector.

Arguments

X

A spatial object such as a window or point pattern.

...

Arguments passed to as.mask to determine the pixel resolution, if required.

squared

Logical. If TRUE, the squared distances will be returned.

Author

Adrian Baddeley

Rolf Turner

and Ege Rubak

Details

The function fardist is generic, with methods for the classes owin and ppp.

For a window W, the command fardist(W) returns a pixel image in which the value at each pixel is the largest distance from that pixel to the boundary of W.

For a point pattern X, with window W, the command fardist(X) returns a numeric vector with one entry for each point of X, giving the largest distance from that data point to the boundary of W.

Examples

  fardist(cells)

  plot(FR <- fardist(letterR))