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.
## S3 method for class 'owin' as.function(x, ...)
x |
Pixel image (object of class |
... |
Ignored. |
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.
A function in the R language with arguments x,y.
It also belongs to the class "indicfun" which has methods
for plot and print.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au, Rolf Turner r.turner@auckland.ac.nz and Ege Rubak rubak@math.aau.dk.
W <- Window(humberside) f <- as.function(W) f f(5000, 4500) f(123456, 78910) X <- runifrect(5, Frame(humberside)) f(X) plot(f)
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