# perimeter {spatstat}

### Description

Computes the perimeter length of a window

### Usage

perimeter(w)

### Arguments

- w
- A window (object of class
`"owin"`

) or data that can be converted to a window by`as.owin`

.

### Details

This function computes the perimeter (length of the boundary) of the window `w`

. If `w`

is a rectangle or a polygonal window, the perimeter is the sum of the lengths of the edges of `w`

. If `w`

is a mask, it is first converted to a polygonal window using `as.polygonal`

, then staircase edges are removed using `simplify.owin`

, and the perimeter of the resulting polygon is computed.

### Values

A numeric value giving the perimeter length of the window.

### See Also

`area.owin`

`diameter.owin`

, `owin.object`

, `as.owin`

### Examples

perimeter(square(3)) data(letterR) perimeter(letterR) if(interactive()) print(perimeter(as.mask(letterR)))

Documentation reproduced from package spatstat, version 1.45-0. License: GPL (>= 2)