Library: | spatial |
See also: | SPKRsurfls SPKRsurfgls SPKRexpcov SPKRgaucov SPKRtrmat SPKRprmat SPKRsemat SPKRcorrelogram SPKRvariogram SPKRmultcontours |
Quantlet: | SPKRsphercov | |
Description: | Spatial covariance function for use with SPKRsurfgls. |
Usage: | covvals = SPKRsphercov (r, d, alpha, se {, D}) | |
Input: | ||
r | n x 1 - vector of distances at which to evaluate the covariance | |
d | scalar - range parameter | |
alpha | sclar - proportion of nugget effect | |
se | scalar - standard deviation at distance zero | |
D | scalar - optional; default D = 2; dimension of spheres | |
Output: | ||
res | n x 1 - vector of covariance values |
; load the spatial statistics library library ("spatial") ; calculate spatial covariance function SPKRsphercov ; with d = 0.7, alpha = 0, se = 1, and D = 2 on a grid ; from 0 through 7 ddat = grid(0, 0.1, 71) linedat = ddat ~ SPKRsphercov (ddat, 0.7, 0, 1, 2) ; create a display and draw the covariance disp = createdisplay (1, 1) show (disp, 1, 1, linedat)
A vector of covariance values. Typically, this quantlet is used together with SPKRsurfgls or SPKRcorrelogram.
Library: | spatial |
See also: | SPKRsurfls SPKRsurfgls SPKRexpcov SPKRgaucov SPKRtrmat SPKRprmat SPKRsemat SPKRcorrelogram SPKRvariogram SPKRmultcontours |