R: Convert Window to Indicator Function

as.function.owin {spatstat.geom} | R Documentation

## Convert Window to Indicator Function

### Description

Converts a spatial window to a function of the x and y coordinates returning the value 1 inside the window and 0 outside.

### Usage

     ## S3 method for class 'owin'
    as.function(x, ...)

### Arguments

`x` | Pixel image (object of class `"owin"`).
`...` | Ignored.

### Details

This command converts a spatial window (object of class `"owin"`) to a `function(x,y)` where the arguments `x` and `y` are (vectors of) spatial coordinates. This is the indicator function of the window: it returns the value 1 for locations inside the window, and returns 0 for values outside the window.

### Value

A function in the R language with arguments `x,y`. It also belongs to the class `"indicfun"` which has methods for `plot` and `print`.

### Author(s)

Adrian Baddeley Adrian.Baddeley@curtin.edu.au, Rolf Turner r.turner@auckland.ac.nz and Ege Rubak rubak@math.aau.dk.

### See Also

`as.im.owin`

### Examples

      W <- Window(humberside)
      f <- as.function(W)
      f
      f(5000, 4500)
      f(123456, 78910)
      X <- runifrect(5, Frame(humberside))
      f(X)
      plot(f)

[Package spatstat.geom version 2.3-2 Index]