

Dear sir,
Ya, Now I am comparing the results from gslib and R/gsat. The shape of variograms exactly overlaps but the position of points varies, I don't know why? or it is normal! I first checked the result of omnidirectional variogram but still to have checked for directional cases. I hope the plot will overlap exactly on these cases too!!
Thanking you
Pujan
 

> Date: Wed, 7 May 2008 15:59:47 +0200> From: edzer.pebesma@uni-muenster.de> To: Thierry.ONKELINX@inbo.be> CC: regmi_pujan@hotmail.com; r-sig-geo@stat.math.ethz.ch> Subject: Re: [R-sig-Geo] variogram using gstat> > ONKELINX, Thierry wrote:> > Dear Pujan,> > > > The helpfile (?variogram) is a wonderfull thing because it answers you> > question about dist. It reads: > > dist the average distance of all point pairs considered for this> > estimate > > > > I think that gstat is based on gslib (Edzer, please correct me if I'm> > wrong). > No, the gstat "core" code is written in C rather than in fortran. It was > written in a similar time, i.e. the early 90s.> > Last year we compared gslib with R and gstat. Both yielded> > simmilar results. We prefered R and gstat over gslib because R is a more> > flexible and versatile tool.> > > I'm always interested in hearing comparison results, and trying to > figure out where differences come from. In theory, results should be > identical rather than similar.> --> Edzer
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