\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, kappas=NULL) } \arguments{ \item{model}{string; covariance model, see \code{\link{CovarianceFct}}, or type \code{\link{PrintModelList}()} to get all options.} \item{kappas}{additional parameters of a parametrised model, see \code{\link{CovarianceFct}}.} } \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{schlath@hsu-hh.de} \url{http://www.unibw-hamburg.de/WWEB/math/schlath/schlather.html}} \seealso{ \code{\link{CovarianceFct}}, \code{\link{RandomFields}}, \code{\link{RFparameters}}, } \examples{ GetPracticalRange("exponential") GetPracticalRange("whittlematern",kappa=2) GetPracticalRange("gengneiting",kappa=c(a=3,b=5)) } \keyword{spatial}