spatstat (version 1.47-0)

as.function.tess: 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

"as.function"(x,...,values=NULL)

Arguments

x

A tessellation (object of class "tess").

values

Optional. A vector giving the values of the function for each tile of x.

...

Ignored.

Value

A function in the R language, also belonging to the class "funxy".

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.

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 <- runifpoint(7)
  V <- dirichlet(X)
  f <- as.function(V)
  f(0.1, 0.4)
  plot(f)