| 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.
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
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))
[Package spatial version 7.3-17 Index]