| as.function.tess {spatstat.geom} | R Documentation |
Convert a Tessellation to a Function
Description
Convert a tessellation into a function of the x and y coordinates.
The default function values are factor levels specifying which tile of the
tessellation contains the point (x,y).
Usage
## S3 method for class 'tess'
as.function(x,...,values=NULL)
Arguments
x |
A tessellation (object of class |
values |
Optional. A vector giving the values of the function for each tile
of |
... |
Ignored. |
Details
This command converts a tessellation
(object of class "tess") to a function(x,y)
where the arguments x and y are (vectors of) spatial
coordinates. The corresponding function values are factor levels
identifying which tile of the tessellation contains each point.
Values are NA if the corresponding point lies outside the
tessellation.
If the argument values is given, then it determines the value
of the function in each tile of x.
Value
A function in the R language, also belonging to the
class "funxy".
Author(s)
Adrian Baddeley Adrian.Baddeley@curtin.edu.au, Rolf Turner rolfturner@posteo.net and Ege Rubak rubak@math.aau.dk
See Also
tileindex for the low-level calculation of tile index.
cut.ppp and split.ppp to
divide up the points of a point pattern according to
a tessellation.
Examples
X <- runifrect(7)
V <- dirichlet(X)
f <- as.function(V)
f(0.1, 0.4)
plot(f)