# funxy

From spatstat v1.34-1
by Adrian Baddeley

##### Spatial Function Class

A simple class of functions of spatial location

##### Usage

`funxy(f, W)`

##### Arguments

- f
- A
`function`

in the Rlanguage with arguments`x,y`

(at least) - W
- Window (object of class
`"owin"`

) inside which the function is well-defined.

##### Details

This creates an object of class `"funxy"`

.
This is a simple mechanism for handling a function
of spatial location $f(x,y)$ to make it easier to display
and manipulate.

`f`

should be a `function`

in the Rlanguage.
The first two arguments of `f`

must be named `x`

and `y`

respectively.

`W`

should be a window (object of class `"owin"`

) inside which the
function `f`

is well-defined.

The function `f`

should be vectorised: that is,
if `x`

and `y`

are numeric vectors of the same length
`n`

, then `v <- f(x,y)`

should be a vector of length `n`

.

##### Value

- A
`function`

, in fact a copy of`f`

, which also belongs to the class`"funxy"`

. This class has methods for`print`

,`plot`

,`contour`

and`persp`

.

##### See Also

##### Examples

```
f <- function(x,y) { x^2 + y^2 - 1}
g <- funxy(f, square(2))
g(0.2, 0.3)
g
```

*Documentation reproduced from package spatstat, version 1.34-1, License: GPL (>= 2)*

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