[R-sig-Geo] fix the value of nugget

[Sherien Al-Azerji]

Dear All,

I'm running Universal kriking method and I need to set the value of nugget
in the variogram model to zero even after fitting a variogram, I need the
fitted variogram to have a zero nugget. How can I do this please.

another question please, some times when I run my code I get this error
message (LDL factor) what this mean? and how can I solve it.

Best Regards
Sherien

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