[R] gstat package. "singular" attibute

From: javier garcia-pintado <jgarcia_at_ija.csic.es>
Date: Fri 05 Jan 2007 - 11:06:00 GMT

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 García-Pintado
Institute of Earth Sciences Jaume Almera (CSIC)
Lluis Sole Sabaris s/n, 08028 Barcelona
Phone: +34 934095410
Fax:   +34 934110012

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Received on Sat Jan 06 19:28:40 2007

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