The calculation of semivraiogram is allready implemented is many R packages. So why do it yourself?
library("sos") findFn("variogram") Gives you 190 hits! ------------------------------------------------------------------------ ---- ir. Thierry Onkelinx Instituut voor natuur- en bosonderzoek team Biometrie & Kwaliteitszorg Gaverstraat 4 9500 Geraardsbergen Belgium Research Institute for Nature and Forest team Biometrics & Quality Assurance Gaverstraat 4 9500 Geraardsbergen Belgium tel. + 32 54/436 185 thierry.onkel...@inbo.be www.inbo.be To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of. ~ Sir Ronald Aylmer Fisher The plural of anecdote is not data. ~ Roger Brinner The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data. ~ John Tukey > -----Oorspronkelijk bericht----- > Van: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] Namens trekvana > Verzonden: donderdag 16 september 2010 8:35 > Aan: r-help@r-project.org > Onderwerp: [R] Pesky homemade function code > > > Hi all- > > this seems to be simple to figure out but since im new to > writing functions I dont know what is happening. Here is my > code along with the error I am > receiving: > > semivario=function(data,ids,times,resids){ > id=unique(data$ids) > index=combinations(length(data$times[data$ids==id[1]]),2) > time=gamma=numeric(dim(index)[1]) > for (j in 1:dim(index)[1]){ > > time[j]=abs(data$times[data$ids==id[1]][index[j,1]]-data$times > [data$ids==id[1]][index[j,2]]) > > gamma[j]=.5*(data$resids[data$ids==id[1]][index[j,1]]-data$res > ids[data$ids==id[1]][index[j,2]])^2 > } > > for (i in id[-1]){ > index=combinations(length(data$times[data$ids==i]),2) > time1=gamma1=numeric(dim(index)[1]) > for (j in 1:dim(index)[1]){ > > time1[j]=abs(data$times[data$ids==i][index[j,1]]-data$times[da > ta$ids==i][index[j,2]]) > > gamma1[j]=.5*(data$resids[data$ids==i][index[j,1]]-data$resids > [data$ids==i][index[j,2]])^2 > } > time=c(time,time1) > gamma=c(gamma,gamma1) > } > value=list(time=time,gamma=gamma) > return(value) > } > > and I would run it as > semivario(data=hope,ids=id,times=sctime,resids=scResid) > > What I want to do is everywhere we see the words > data,ids,times,resids to be replaced with, for example, > hope,id,sctime,scResid. Think of macros in SAS where we use > the & before every macro input variable name. Im not sure if > this is how R handles function inputs. > > Here is my error: > Error in combinations(length(data$times[data$ids == id[1]]), 2) : > bad value of n > > > Thanks > > -- > View this message in context: > http://r.789695.n4.nabble.com/Pesky-homemade-function-code-tp2 > 541597p2541597.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > Druk dit bericht a.u.b. niet onnodig af. Please do not print this message unnecessarily. Dit bericht en eventuele bijlagen geven enkel de visie van de schrijver weer en binden het INBO onder geen enkel beding, zolang dit bericht niet bevestigd is door een geldig ondertekend document. The views expressed in this message and any annex are purely those of the writer and may not be regarded as stating an official position of INBO, as long as the message is not confirmed by a duly signed document. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.