kriging with gauss.cov

Alison_Riding@adas.co.uk
14 Jan 98 10:31:00 GMT


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Dear colleagues.

Please could anyone suggest where I have gone wrong with the following:

S-PLUS : Copyright 1988, 1995 MathSoft, Inc.
S : Copyright AT&T.
Version 3.3 Release 1 for MS Windows 3.1 : 1995
Working data will be in _Data
> tacia.lon4.krige_krige(ozone~loc(lat.m, height), data=lon4,

covfun=gauss.cov,
+ range=1480, sill=73.75, nugget=0.0)
Error in .Fortran("ssukrige",: Covariance matrix is not positive definite
In addition: Warning messages:
Covariance matrix is not positive definite in: .Fortran("ssukrige", ....
Dumped
Error was while calling subroutine "ssukrige"
>

Many thanks

Alison

________________________________
Dr Alison Riding
ADAS Consulting Ltd.
Woodthorne
Wolverhampton
WV6 8TQ
U.K.

Tel: +44 (0) 1902 693129
Fax: +44 (0) 1902 693166
E-Mail: Alison_Riding@adas.co.uk
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