My guess is that you have two data points which are very close together. The normal way out is to included a nugget effect in your model, but it can also be appropriate to leave out one of a pair of points.
On Tue, 19 Jul 2005, orkun wrote: > hello > > I try to build DEM using Krig function of fields package. > And I get this error message. > here is the procedure I followed: > > > dt<-read.table("/usr/local/bartin/stat/topostat1",header=F,sep="|") > > names(dt) <-c("x","y","z") > > coord<-cbind(dt$x,dt$y) > > elevation<-cbind(dt$z) > > fit1<-Krig(coord,elevation,cov.function=exp.cov,scale.type="range") > [1] "condition number is 907405545.878743" > Error in Krig(kord, el, cov.function = exp.cov, scale.type = "range") : > Covariance matrix is close > to > singular > > here is the structure of my data: > > `data.frame': 3911 obs. of 3 variables: > $ x: num 50139 50169 50214 50223 50227 ... > $ y: num 4592999 4593322 4593054 4593151 4593246 ... > $ z: int 320 320 320 320 320 320 320 320 320 320 ... > > what do you suggest to solve the problem ? > > kind regards > > > > ______________________________________ > XamimeLT - installed on mailserver for domain @deprem.gov.tr > Queries to: [EMAIL PROTECTED] > ______________________________________ > The views and opinions expressed in this e-mail message are ...{{dropped}} > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html > -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html