# domain

##### Extract the Domain of any Spatial Object

Given a spatial object such as a point pattern, in any number of dimensions, this function extracts the spatial domain in which the object is defined.

##### Usage

`domain(X, …)` # S3 method for ppp
domain(X, …)

# S3 method for psp
domain(X, …)

# S3 method for im
domain(X, …)

# S3 method for ppx
domain(X, …)

# S3 method for pp3
domain(X, …)

# S3 method for lpp
domain(X, …)

# S3 method for ppm
domain(X, …, from=c("points", "covariates"))

# S3 method for kppm
domain(X, …, from=c("points", "covariates"))

# S3 method for dppm
domain(X, …, from=c("points", "covariates"))

# S3 method for lpp
domain(X, …)

# S3 method for lppm
domain(X, …)

# S3 method for msr
domain(X, …)

# S3 method for quad
domain(X, …)

# S3 method for quadratcount
domain(X, …)

# S3 method for quadrattest
domain(X, …)

# S3 method for tess
domain(X, …)

# S3 method for linfun
domain(X, …)

# S3 method for lintess
domain(X, …)

# S3 method for im
domain(X, …)

# S3 method for layered
domain(X, …)

# S3 method for distfun
domain(X, …)

# S3 method for nnfun
domain(X, …)

# S3 method for funxy
domain(X, …)

# S3 method for rmhmodel
domain(X, …)

# S3 method for leverage.ppm
domain(X, …)

# S3 method for influence.ppm
domain(X, …)

##### Arguments

- X
A spatial object such as a point pattern (in any number of dimensions), line segment pattern or pixel image.

- …
Extra arguments. They are ignored by all the methods listed here.

- from
Character string. See Details.

##### Details

The function `domain`

is generic.

For a spatial object `X`

in any number of dimensions,
`domain(X)`

extracts the spatial domain in which `X`

is
defined.

For a two-dimensional object `X`

, typically `domain(X)`

is the same as `domain(X)`

.

The exception is that, if `X`

is a point pattern on a linear network
(class `"lpp"`

) or a point process model on a linear network
(class `"lppm"`

), then `domain(X)`

is the linear network
on which the points lie, while `Window(X)`

is the two-dimensional
window containing the linear network.

The argument `from`

applies when `X`

is a fitted
point process model
(object of class `"ppm"`

, `"kppm"`

or `"dppm"`

).
If `from="data"`

(the default),
`domain`

extracts the window of the original point
pattern data to which the model was fitted.
If `from="covariates"`

then `domain`

returns the
window in which the spatial covariates of the model were provided.

##### Value

A spatial object representing the domain of `X`

.
Typically a window (object of class `"owin"`

),
a three-dimensional box (`"box3"`

), a multidimensional
box (`"boxx"`

) or a linear network (`"linnet"`

).

##### See Also

##### Examples

```
# NOT RUN {
domain(cells)
domain(bei.extra$elev)
domain(chicago)
# }
```

*Documentation reproduced from package spatstat, version 1.57-1, License: GPL (>= 2)*