expcov(r, d, alpha=0, se=1) gaucov(r, d, alpha=0, se=1) sphercov(r, d, alpha=0, se=1, D=2)
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. |
surf.gls
.surf.gls