R: Test Whether An Object Is Empty

is.empty {spatstat.geom} | R Documentation

## Test Whether An Object Is Empty

### Description

Checks whether the argument is an empty window, an empty point pattern, etc.

### Usage

    is.empty(x)
    ## S3 method for class 'owin'
    is.empty(x)
    ## S3 method for class 'ppp'
    is.empty(x)
    ## S3 method for class 'psp'
    is.empty(x)
    ## Default S3 method:
    is.empty(x)

### Arguments

`x` | A window (object of class `"owin"`), a point pattern (object of class `"ppp"`), or a line segment pattern (object of class `"psp"`).

### Details

This function tests whether the object `x` represents an empty spatial object, such as an empty window, a point pattern with zero points, or a line segment pattern with zero line segments.

An empty window can be obtained as the output of `intersect.owin`, `erosion`, `opening`, `complement.owin` and some other operations.

An empty point pattern or line segment pattern can be obtained as the result of simulation.

### Value

Logical value.

### Author(s)

Adrian Baddeley Adrian.Baddeley@curtin.edu.au

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

[Package spatstat.geom version 2.3-2 Index]