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Spatial Covariance Functions

Usage

expcov(r, d, alpha=0, se=1)
gaucov(r, d, alpha=0, se=1)
sphercov(r, d, alpha=0, se=1, D=2)

Arguments

r vector of distances at which to evaluate the covariance
d range parameter
alpha proportion of nugget effect
se standard deviation at distance zero
D dimension of spheres.

Description

Spatial covariance functions for use with surf.gls.

Value

vector of covariance values.

See Also

surf.gls, correlogram