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2004 Mar 19
1
Spatial Statistics: surf.gls
In an experimental setup we obtain z-data samples at equidistant grid points.
The surf.gls (Kriging) algorithm produces an error under this circumstance when performing the Choleski decomposition.
A workaround is to dither the grid coordinates using (x <- rnorm(length(x)) ; y<- rnowm(length(y))).
Question: Is this an expected behaviour of the surf.gls function ?
Regards,
Berthold
---------------------------------
Dr. Berthold Stegemann
Senior Scientist
Bakken Research Center
Heart Failure Management
Endepolsdomein 5
6229 GW Maastricht
The Netherlands
Office: +31.43.3566....