# as.owin

From spatstat v1.5-4
by Adrian Baddeley

##### Convert Data To Class owin

Converts data specifying an observation window
in any of several formats, into an object of class `"owin"`

.

- Keywords
- spatial

##### Usage

`as.owin(W)`

##### Arguments

- W
- Data specifying an observation window, in any of several formats
described under
*Details*below.

##### Details

The class `"owin"`

is a way of specifying the observation window
for a point pattern. See `owin.object`

for an overview.
This function converts data in any of several formats
into an object of class `"owin"`

for use by the `spatstat`

package. The argument `W`

may be

- an object of class
`"owin"`

- a structure with entries
`xrange`

,`yrange`

specifying the$x$and$y$dimensions of a rectangle - a four-element vector
(interpreted as
`(xmin, xmax, ymin, ymax)`

) specifying the$x$and$y$dimensions of a rectangle - a structure with entries
`xl`

,`xu`

,`yl`

,`yu`

specifying the$x$and$y$dimensions of a rectangle as`(xmin, xmax) = (xl, xu)`

and`(ymin, ymax) = (yl, yu)`

. This will accept objects of class`spp`

used in the Venables and Ripley`spatial`

library. - an object of class
`"ppp"`

representing a point pattern. In this case, the object's`window`

structure will be extracted. - an object of class
`"im"`

representing a pixel image. In this case, a window of type`"mask"`

will be returned, with the same pixel raster coordinates as the image. An image pixel value of`NA`

, signifying that the pixel lies outside the window, is transformed into the logical value`FALSE`

, which is the corresponding convention for window masks.

##### Value

- An object of class
`"owin"`

(see`owin.object`

) specifying an observation window.

##### See Also

##### Examples

```
w <- as.owin(c(0,1,0,1))
w <- as.owin(list(xrange=c(0,5),yrange=c(0,10)))
# point pattern
data(demopat)
w <- as.owin(demopat)
# image
Z <- as.im(function(x,y) { x + 3}, unit.square())
w <- as.owin(Z)
# Venables & Ripley 'spatial' package
require(spatial)
towns <- ppinit("towns.dat")
w <- as.owin(towns)
detach(package:spatial)
```

*Documentation reproduced from package spatstat, version 1.5-4, License: GPL version 2 or newer*

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