rMosaicField {spatstat.random}

Mosaic Random Field

Description

Generate a realisation of a random field which is piecewise constant on the tiles of a given tessellation.

Usage

rMosaicField(X, 
    rgen = function(n) { sample(0:1, n, replace = TRUE)},
    ...,
    rgenargs=NULL)

Arguments

X

A tessellation (object of class "tess").

...

Arguments passed to as.mask determining the pixel resolution.

rgen

Function that generates random values for the tiles of the tessellation.

rgenargs

List containing extra arguments that should be passed to rgen (typically specifying parameters of the distribution of the values).

Details

This function generates a realisation of a random field which is piecewise constant on the tiles of the given tessellation X. The values in each tile are independent and identically distributed.

Value

A pixel image (object of class "im").

Author(s)

Adrian Baddeley [e-mail] and Rolf Turner [e-mail]

See Also

rpoislinetess, rMosaicSet

Examples

   if(interactive()) {
     lambda <- 3
     d <- 256
     n <- 30
   } else {
     lambda <- 1
     d <- 32
     n <- 5
   }
   X <- rpoislinetess(lambda)
   plot(rMosaicField(X, runif, dimyx=d))
   plot(rMosaicField(X, rnorm, rgenargs=list(mean=10, sd=2), dimyx=d))
   Y <- dirichlet(runifpoint(n))
   plot(rMosaicField(Y, rnorm, dimyx=d))