On Thu, 18 Oct 2001, Laurent Dubroca wrote:
> Dear Users,
>
> I use Sgeostat to calculate co variogram (function est.variogram with two
> variables).
> If i inverse the 2 variables in the functions, the co variogram change!
> Normaly it is symmetric, isn't it?
not necessarily
have a look at "lag effects"
supposedly described in Journal & Huijbregts, 1978, p.41
or in Goovaerts: Geostatistics for Natural Resources Evaluation, p.49
> Someone could me explain why, or give me an idea to calculate co variogram
> in a easy way...
have you looked at GSLIB or GSTAT?
J>
> Thanks in advance
>
> Laurent
>
> ps : sorry for my english
>
>
> Laurent William Dubroca
> Centre de Calcul de Chizé
> CNRS UPR 1934
> BP 14 - Villiers en Bois - 79360 Beauvoir sur Niort
> France
> Ph : +33-(0)549.099.603
> Fax : +33-(0)549.096.526
>
>
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
> r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
> Send "info", "help", or "[un]subscribe"
> (in the "body", not the subject !) To: r-help-request at
stat.math.ethz.ch
>
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
>
***********************************************************************
Jens Nieschulze
Institute for Forest Biometrics & Phone: ++49-551-39-12107
Applied Computer Science Fax : ++49-551-39-3465
Buesgenweg 4
37077 Goettingen E-mail: jniesch at uni-forst.gwdg.de
GERMANY http://www.uni-forst.gwdg.de/~jniesch
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !) To: r-help-request at
stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._