# perimeter

From spatstat v1.17-0
by Adrian Baddeley

##### Perimeter Length of Window

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.

##### Value

- A numeric value giving the perimeter length of the window.

##### See Also

##### Examples

```
perimeter(square(3))
data(letterR)
perimeter(letterR)
if(interactive()) {
print(perimeter(as.mask(letterR)))
} else print(perimeter(as.mask(letterR, dimyx=32)))
```

*Documentation reproduced from package spatstat, version 1.17-0, License: GPL (>= 2)*

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