R: Determine Whether One Window is Contained In Another

is.subset.owin {spatstat.geom} | R Documentation

## Determine Whether One Window is Contained In Another

### Description

Tests whether window `A` is a subset of window `B`.

### Usage

    is.subset.owin(A, B)

### Arguments

`A` | A window object (see Details).
`B` | A window object (see Details).

### Details

This function tests whether the window `A` is a subset of the window `B`.

The arguments `A` and `B` must be window objects (either objects of class `"owin"`, or data that can be coerced to this class by `as.owin`).

Various algorithms are used, depending on the geometrical type of the two windows.

Note that if `B` is not rectangular, the algorithm proceeds by discretising `A`, converting it to a pixel mask using `as.mask`. In this case the resulting answer is only “approximately correct”. The accuracy of the approximation can be controlled: see `as.mask`.

### Value

Logical scalar; `TRUE` if `A` is a sub-window of `B`, otherwise `FALSE`.

### Author(s)

Adrian Baddeley Adrian.Baddeley@curtin.edu.au

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

### Examples

       w1 <- as.owin(c(0,1,0,1))
       w2 <- as.owin(c(-1,2,-1,2))
       is.subset.owin(w1,w2)  # Returns TRUE.
       is.subset.owin(w2,w1)  # Returns FALSE.

[Package spatstat.geom version 2.2-0 Index]