expcov: Spatial Covariance Functions

Description Usage Arguments Value References See Also Examples

View source: R/kr.R

Description

Spatial covariance functions for use with surf.gls.

Usage

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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.

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

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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))

Example output



spatial documentation built on May 29, 2017, 8 p.m.

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