RandomFields (version 1.3.27)

GetPracticalRange: 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 (variance=1, nugget=0, scale=1) values 0.05

Usage

GetPracticalRange(model, kappas=NULL, dim=1)

Arguments

model

string; covariance model, see CovarianceFct, or type PrintModelList() to get all options.

kappas

additional parameters of a parametrised model, see CovarianceFct.

dim

space-time dimension; except for some few anisotropic models, this parameter does not have an effect

Value

• real number (the practical range)

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

References

Goovaerts, P. (1997) Geostatistics for Natural Resources Evaluation. New York: Oxford University Press.

See Also

CovarianceFct, RandomFields, RFparameters,

Examples

GetPracticalRange("exponential")
GetPracticalRange("whittlematern",kappa=2)
GetPracticalRange("gengneiting",kappa=c(a=3,b=5))