[R] Pesky homemade function code

[ONKELINX, Thierry]

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.Onkelinx op 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-bounces op r-project.org 
> [mailto:r-help-bounces op r-project.org] Namens trekvana
> Verzonden: donderdag 16 september 2010 8:35
> Aan: r-help op 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 op r-project.org mailing list
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> PLEASE do read the posting guide 
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 

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