https://github.com/cran/RandomFields
Tip revision: af7aa2881d9fd941be5411589f41ac2ed9d24e57 authored by Martin Schlather on 11 March 2011, 00:00:00 UTC
version 2.0.45
version 2.0.45
Tip revision: af7aa28
GetPracticalRange.Rd
\name{GetPracticalRange}
\alias{GetPracticalRange}
\alias{PracticalRange}
\title{Determination of the practical range}
\description{
the function returns the practical range of a covariance model,
i.e. the distance for which the model with standard parameters
(\code{variance=1}, \code{nugget=0}, \code{scale=1}) values 0.05
}
\usage{
GetPracticalRange(model, param, dim=1)
}
\arguments{
\item{model}{covariance model in the new list not;
the model must be primitive, i.e. may not call other models.
See \command{\link{Covariance}} and \command{\link{CovarianceFct}}
for details.}
\item{param}{optional vector of parameters for the model,
see \command{\link{CovarianceFct}}}
\item{dim}{space-time dimension; except for some few anisotropic
models, this parameter does not have an effect}
}
\details{
In case the practical range has to be determined numerically, only a
rough approximation is provided.
The function can only be applied to isotropic models
}
\value{
real number (the practical range)
}
\references{
Goovaerts, P. (1997) \emph{Geostatistics for Natural Resources
Evaluation.} New York: Oxford University Press.
}
\author{Martin Schlather, \email{martin.schlather@math.uni-goettingen.de}
\url{http://www.stochastik.math.uni-goettingen.de/~schlather}}
\seealso{ \command{\link{CovarianceFct}},
\code{\link{RandomFields}},
\command{\link{RFparameters}},
}
\examples{
GetPracticalRange(list("exponential"))
GetPracticalRange(list("whittle", nu=2))
try(GetPracticalRange(list("bessel", nu=-0.5))) # leads to an error
}
\keyword{spatial}