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