expcov {spatial}R Documentation

Spatial Covariance Functions

Description

Spatial covariance functions for use with surf.gls.

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.

Value

vector of covariance values.

See Also

surf.gls

Examples

data(topo, package="MASS")
topo.kr <- surf.ls(2, topo)
correlogram(topo.kr, 25)
d <- seq(0, 7, 0.1)
lines(d, expcov(d, 0.7))

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