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RFfctn

Evaluate Covariance and Variogram Functions

Description

RFfctn returns the values of a shape function.

Usage

RFfctn(model, x, y = NULL, z = NULL, T = NULL, grid, params, distances, dim,...)

Arguments

model,params

object of class RMmodel, RFformula or formula; best is to consider the examples below, first.
The argument params is a list that specifies free parameters in a formula description, see RMformula.

x

vector of x coordinates, or object of class GridTopology or raster; for more options see RFsimulateAdvanced.
y,z

optional vectors of y (z) coordinates, which should not be given if x is a matrix.
T

optional vector of time coordinates, T must always be an equidistant vector. Instead of T=seq(from=From, by=By, len=Len), one may also write T=c(From, By, Len).
grid

logical; the function finds itself the correct value in nearly all cases, so that usually grid need not be given. See also RFsimulateAdvanced.
distances,dim

another alternative for the argument x to pass the (relative) coordinates, see RFsimulateAdvanced.
...

for advanced use: further options and control arguments for the simulation that are passed to and processed by RFoptions. If params is given, then ... may include also the variables used in params.

Details

RFcovmatrix also allows for variogram models. Then the negative of the variogram matrix is returned.

Value

RFfctn returns a vector.

Author(s)

See Also

Examples

RFoptions(seed=0) ## *ANY* simulation will have the random seed 0; set
##                   RFoptions(seed=NA) to make them all random again

model <- RMexp() - 1
RFfctn(model, 1:10)
RandomFields

Simulation and Analysis of Random Fields

v3.3.10
GPL (>= 3)
Authors
Martin Schlather [aut, cre], Alexander Malinowski [aut], Marco Oesting [aut], Daphne Boecker [aut], Kirstin Strokorb [aut], Sebastian Engelke [aut], Johannes Martini [aut], Felix Ballani [aut], Olga Moreva [aut], Jonas Auel[ctr], Peter Menck [ctr], Sebastian Gross [ctr], Ulrike Ober [ctb], Paulo Ribeiro [ctb], Brian D. Ripley [ctb], Richard Singleton [ctb], Ben Pfaff [ctb], R Core Team [ctb]
Initial release

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