R: Extract Subset of Linear Network

Extract.linnet {spatstat.linnet} | R Documentation

## Extract Subset of Linear Network

### Description

Extract a subset of a linear network.

### Usage

      ## S3 method for class 'linnet'
    x[i, ..., snip=TRUE]

### Arguments

`x` | A linear network (object of class `"linnet"`).
`i` | Spatial window defining the subregion. An object of class `"owin"`.
`snip` | Logical. If `TRUE` (the default), segments of `x` which cross the boundary of `i` will be cut by the boundary. If `FALSE`, these segments will be deleted.
`...` | Ignored.

### Details

This function computes the intersection between the linear network `x` and the domain specified by `i`.

This function is a method for the subset operator `"["` for linear networks (objects of class `"linnet"`). It is provided mainly for completeness.

The index `i` should be a window.

The argument `snip` specifies what to do with segments of `x` which cross the boundary of `i`. If `snip=FALSE`, such segments are simply deleted. If `snip=TRUE` (the default), such segments are cut into pieces by the boundary of `i`, and those pieces which lie inside the window `i` are included in the resulting network.

### Value

Another linear network (object of class `"linnet"`).

### Author(s)

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

### Examples

      p <- par(mfrow=c(1,2), mar=0.2+c(0,0,1,0))
      B <- owin(c(0.1,0.7),c(0.19,0.6))

      plot(simplenet, main="x[w, snip=TRUE]")
      plot(simplenet[B], add=TRUE, col="green", lwd=3)
      plot(B, add=TRUE, border="red", lty=3)

      plot(simplenet, main="x[w, snip=FALSE]")
      plot(simplenet[B, snip=FALSE], add=TRUE, col="green", lwd=3)
      plot(B, add=TRUE, border="red", lty=3)

      par(p)

[Package spatstat.linnet version 2.0-0 Index]