RandomFields: RMmult – R documentation

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RMmult

Multiplication of Random Field Models

Description

RMmult is a multivariate covariance model which depends on up to 10 submodels C_0, C_1, ..., C_9. In general, realizations of the created RMmodel are pointwise products of independent realizations of the submodels.

In particular, if all submodels are given through a covariance function, the resulting model is defined through its covariance function, which is the product of the submodels' covariances.

Usage

RMmult(C0, C1, C2, C3, C4, C5, C6, C7, C8, C9, var, scale, Aniso, proj)

Arguments

`C0`	an `RMmodel`.
`C1,C2,C3,C4,C5,C6,C7,C8,C9`	optional; each an `RMmodel`.
`var,scale,Aniso,proj`	optional arguments; same meaning for any `RMmodel`. If not passed, the above model remains unmodified.

Details

RMmodels can also be multiplied via the *-operator, e.g. C0 * C1.

The global arguments scale,Aniso,proj of RMmult are multiplied to the corresponding argument of the submodels (from the right side). E.g.,
RMmult(Aniso=A1, RMexp(Aniso=A2), RMspheric(Aniso=A3))
equals
RMexp(Aniso=A2 %*% A1) * RMspheric(Aniso=A3 %*% A1)

In case that all submodels are given through a covariance function, the global argument var of RMmult is multiplied to the product covariance of RMmult.

Value

RMmult returns an object of class RMmodel.

Author(s)

Martin Schlather, schlather@math.uni-mannheim.de, https://www.wim.uni-mannheim.de/schlather/

Examples

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

# separable, multiplicative model
model <- RMgauss(proj=1) * RMexp(proj=2, scale=5)
z <- RFsimulate(model=model, 0:10, 0:10, n=4)
plot(z)

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