[R] gstat package. "singular" attibute

[javier garcia-pintado]

Hello,
I'm using the gstat package within R for an automated procedure that
uses ordinary kriging.
I can see that there is a logical ("singular") atrtibute of some
adjusted model semivariograms:

.- attr(*, "singular")= logi TRUE

I cannot find documentation about the exact meaning and the implications
of this attribute, and I dont know anything about the inner calculations
of model semivariograms.

I guess that the inverse of some matrix need to be  calculated , and
this matrix is singular, but I also see that the model semivariogram is
calculated anyway.

Could you briefly tell me something about the significance of this
attribute and if I should not use these model semivariograms when the
"singular" attibute is true?

Thank you very much and best regards,

Javier


-- 
Javier García-Pintado
Institute of Earth Sciences Jaume Almera (CSIC)
Lluis Sole Sabaris s/n, 08028 Barcelona
Phone: +34 934095410
Fax:   +34 934110012
e-mail:jgarcia at ija.csic.es