as.function.owin

0th

Percentile

Convert Window to Indicator Function

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

Keywords
manip, spatial
Usage
# S3 method for 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.

See Also

as.im.owin

Aliases
  • as.function.owin
Examples
# NOT RUN {
  W <- Window(humberside)
  f <- as.function(W)
  f
  f(5000, 4500)
  f(123456, 78910)
  X <- runifpoint(5, Frame(humberside))
  f(X)
  plot(f)
# }
Documentation reproduced from package spatstat, version 1.57-1, License: GPL (>= 2)

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