# is.empty

From spatstat v1.28-1
by Adrian Baddeley

##### Test Whether An Object Is Empty

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)
## S3 method for class 'default':
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.

*Documentation reproduced from package spatstat, version 1.28-1, License: GPL (>= 2)*

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