Skip to Content
Home » Language reference » expcov {spatial}

expcov {spatial}

Spatial Covariance Functions
Package: 
spatial
Version: 
Recommended

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.

Values

vector of covariance values.

References

Ripley, B. D. (1981) Spatial Statistics. Wiley. Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.

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))

Documentation reproduced from R 3.0.1. License: GPL-2.