[R-sig-Geo] Cross-validaton with "geoR" for ordinary least squares fit

[ToNoY]

I've fitted a model using "geoR" package of 'R' as follows:

#ordinary least squares fit
ini.vals <- expand.grid(seq(20000,50000,l=5), seq(0.01,0.1,l=5))
ols = variofit(vario.mydata, ini=ini.vals, fix.nug=F, wei="equal")
summary(ols)
vario.mydata=variog(mydata, max.dist=0.123)
plot(vario.mydata,main="OLS")
lines(ols,lty=2,col=3, lw=2)

The summary/plot of the model is fine. But when I want to cross-validate my
model, 'R' throws me the following error which I know not beans about.

Error in if (length(data) != n) stop(paste("incompatible sizes: coords (", 
:    argument is of length zero

Any suggestions/idea why?




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