[R] Strange error message from geoR´s likfit () lik. max. func.

[Paulo Justiniano Ribeiro Jr]

Ruben

it is a bug
I will upload a new version of geoR.
Meanwhile please download the version with the fix from the geoR web page
at
www.leg.ufpr.br/geoR


Paulo Justiniano Ribeiro Jr
LEG (Laboratorio de Estatistica e Geoinformacao)
Universidade Federal do Parana
Caixa Postal 19.081
CEP 81.531-990
Curitiba, PR  -  Brasil
Tel: (+55) 41 3361 3573
Fax: (+55) 41 3361 3141
e-mail: paulojus AT  ufpr  br
http://www.leg.ufpr.br/~paulojus



On Fri, 15 Aug 2008, Ruben Roa Ureta wrote:

> ComRades:
>
> I am geeting the error message
> Error in ldots[[which(MET)]] : attempt to select less than one element
> when I try to fit the geostatistical model with the likfit() function of
> geoR.
> I have tried with old data for which likfit() successfully maximised the
> likelihood in previous versions of geoR, and yet the current version
> fails.
> I have tried in Windows Vista and Windows XP (I haven't tried in Linux
> systems) and the problem occurs in both systems.
> Below I show the issue with simulated data.
> Is it a geoR bug?
> Does anybody know a solution?
> Thanks in advance
> Ruben
>
> x <- rnorm(50,5,2) # eastings
> y <- rnorm(50,25,3) # northings
> z <- rnorm(50,350,35) # data
> v <- c(rep(1,25),rep(2,25)) # two different areas
> w <- data.frame(cbind(x,y,z,v)) # put all together
> w1 <- subset(w,v == 1) # use data fron one area
> w1.geo <- as.geodata(w1,coords.col=1:2,data.col=3) # create geodata object
> summary(w1.geo) # everything looks normal
> #Number of data points: 25
> #
> #Coordinates summary
> #           x        y
> #min 1.233673 15.82129
> #max 8.464283 34.30390
> #
> #Distance summary
> #       min        max
> # 0.2962488 19.5670141
> #
> #Data summary
> #   Min. 1st Qu.  Median    Mean 3rd Qu.    Max.
> #  296.1   336.3   345.5   351.9   366.5   422.1
> plot(w1.geo) # so far so good
> plot(w1.geo,lambda=0.1) #ditto
> w1.geo.vc<-variog(w1.geo,option="cloud",max.dist=summary(w1.geo)$distances.summary[2],lambda=lambda)
> #variog: computing omnidirectional variogram
> plot(w1.geo.vc)
> w1.geo.lf<-likfit(w1.geo,cov.model="matern",ini.cov.pars=c(2,0.03),kappa=1,fix.kappa=FALSE,nugget=0.01,lambda=lambda,fix.lambda=FALSE,hessian=TRUE)
> # here the error in likfit()
> #Error in ldots[[which(MET)]] : attempt to select less than one element
> sessionInfo()
> #R version 2.6.2 (2008-02-08)
> #i386-pc-mingw32
> #
> #locale:
> #LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
> States.1252;LC_MONETARY=English_United
> States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252
> #
> #attached base packages:
> #[1] stats     graphics  grDevices utils     datasets  methods   base
> #
> #other attached packages:
> #[1] geoR_1.6-21 sp_0.9-25
> #
> #loaded via a namespace (and not attached):
> #[1] grid_2.6.2     lattice_0.17-4 tools_2.6.2
>
>