spatstat.geom (version 3.2-1)

bdist.points: Distance to Boundary of Window

Description

Computes the distances from each point of a point pattern to the boundary of the window.

Usage

bdist.points(X)

Value

A numeric vector, giving the distances from each point of the pattern to the boundary of the window.

Arguments

X

A point pattern (object of class "ppp").

Author

Adrian Baddeley and Rolf Turner

Details

This function computes, for each point $x_i$ in the point pattern X, the shortest distance $d(x_i,W^c)$ from $x_i$ to the boundary of the window $W$ of observation.

If the window Window(X) is of type "rectangle" or "polygonal", then these distances are computed by analytic geometry and are exact, up to rounding errors. If the window is of type "mask" then the distances are computed using the real-valued distance transform, which is an approximation with maximum error equal to the width of one pixel in the mask.

See Also

bdist.pixels, bdist.tiles, ppp.object, erosion

Examples

  d <- bdist.points(cells)