R: Determine Whether a Point Pattern is Connected

is.connected.ppp {spatstat} | R Documentation

## Determine Whether a Point Pattern is Connected

### Description

Determine whether a point pattern is topologically connected when all pairs of points closer than a threshold distance are joined.

### Usage

    ## S3 method for class 'ppp'
    is.connected(X, R, ...)

### Arguments

`X` | A point pattern (object of class `"ppp"`).
`R` | Threshold distance. Pairs of points closer than `R` units apart will be joined together.
`...` | Ignored.

### Details

The function `is.connected` is generic. This is the method for point patterns (objects of class `"ppp"`).

The point pattern `X` is first converted into an abstract graph by joining every pair of points that lie closer than `R` units apart. Then the algorithm determines whether this graph is connected.

That is, the result of `is.connected(X)` is `TRUE` if any point in `X` can be reached from any other point, by a series of steps between points of `X`, each step being shorter than `R` units in length.

### Value

A logical value.

### Author(s)

Adrian Baddeley Adrian.Baddeley@curtin.edu.au, Rolf Turner r.turner@auckland.ac.nz and Ege Rubak rubak@math.aau.dk

### See Also

`is.connected`, `connected.ppp`.

### Examples

      is.connected(redwoodfull, 0.1)
      is.connected(redwoodfull, 0.2)

[Package spatstat version 1.63-3 Index]