[R] Tps

[Rachid Cheddadi]

Hi,
I have a 4 column file (long/lat/elev/variable) and I tried to fit the
values of my variable to the XYZ space using Tps and I keep getting the
following message:
Warning messages:
1: GCV search gives a minumum at the endpoints of the grid search in:
Krig.find.gcvmin(info, lambda.grid, gcv.grid$GCV, Krig.fgcv,
 
2: GCV search gives a minumum at the endpoints of the grid search in:
Krig.find.gcvmin(info, lambda.grid, gcv.grid$GCV.one, Krig.fgcv.one,
3: Failed to find the upcrossing in: find.upcross(Krig.fs2hat, info,
upcross.level = shat.pure.error^2,

Any help please?
Many thanks
Rachid
-- 
Dr. Rachid Cheddadi
European Pollen Database         Tel: 00.33.(0)4.90.96.18.18
Ancien Archeveche               Fax: 00.33.(0)4.90.93.98.03
13200 Arles -France             email: rachid.cheddadi at lbhp.u-3mrs.fr
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