R: Distance to Boundary of Window

bdist.points {spatstat} | R Documentation

## 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)

### Arguments

`X` | A point pattern (object of class `"ppp"`).

### Details

This function computes, for each point x[i] in the point pattern `X`, the shortest distance dist(x[i], W') 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.

### Value

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

### Author(s)

Adrian Baddeley Adrian.Baddeley@curtin.edu.au

and Rolf Turner r.turner@auckland.ac.nz

### See Also

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

### Examples

      data(cells)
      d <- bdist.points(cells)

[Package spatstat version 1.54-0 Index]