[S] S+ Spatial stats question

Steven I . Pousty (sip94001@uconnvm.uconn.edu)
Tue, 13 Oct 1998 19:18:13 -0400


Dear S+ians

Can you please help me decipher, and hopefully correct, the following
message...
> elev.krige.gaus <- krige(Z~loc(X,Y), data = elev, covfun=gauss.cov,
+ range = 90, sill = 115)
Error in .Fortran("ssukrige",: Covariance matrix is not positive
definite
Dumped
Warning messages:
Covariance matrix is not positive definite in: .Fortran("ssukrige",
..
.
I can get krige to work for a spherical model, but not for the
gaussian. Is this a problem with a large matrix (over 900 elements in
the elev data set) in S+?

Thanks in advance,
Steven Pousty

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