R: Determine Whether an Object is Connected

is.connected {spatstat}

R Documentation

Determine Whether an Object is Connected

Description

Determine whether an object is topologically connected.

Usage

is.connected(X, ...)

## Default S3 method:
is.connected(X, ...)

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

Arguments

`X`	A spatial object such as a pixel image (object of class `"im"`), a window (object of class `"owin"`) or a linear network (object of class `"linnet"`).
`...`	Arguments passed to `connected` to determine the connected components.

Details

The command is.connected(X) returns TRUE if the object X consists of a single, topologically-connected piece, and returns FALSE if X consists of several pieces which are not joined together.

The function is.connected is generic. The default method is.connected.default works for many classes of objects, including windows (class "owin") and images (class "im"). There is a method for linear networks, is.connected.linnet, described here, and a method for point patterns described in is.connected.ppp.

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.

Examples

  d <- distmap(cells, dimyx=256)
  X <- levelset(d, 0.07)
  plot(X)
  is.connected(X)

[Package spatstat version 1.56-0 Index]