[R] Getting names of variables without quotes

[Amarjit Singh Sethi]

Dear Menne/ Jorge

Many thanks for the help rendered by you both.

Now, may I augment my problem. 

While running the regressions (through 'for' loop), I tried to generate time series plots for each iteration. Although the summary results from regressions were saved in the output file (through sink() statement), yet the plots were not saved. The tried code was:

x=read.table("sample.txt",header=T,sep="\t")
out="output.txt"
sink(out)
x
nm = names(x)
nm
for (i in 1:2)
{
  for(j in (i+1):3) 
  {
    formula= as.formula(paste(nm[i]," ~ ",nm[j],sep=""))
    slr=lm(formula, data=x)
    smr=summary(slr)
    print(smr)

    fit=fitted(slr)
    tsp=ts.plot(fit)

  }
}
sink()


Kindly help to get the plots saved, preferably in separate output files for each iteration. 

regards

ajss

--- On Sun, 19/10/08, Dieter Menne <dieter.menne at menne-biomed.de> wrote:

> From: Dieter Menne <dieter.menne at menne-biomed.de>
> Subject: Re: [R] Getting names of variables without quotes
> To: r-help at stat.math.ethz.ch
> Date: Sunday, 19 October, 2008, 9:29 PM
> Amarjit Singh Sethi <set_alt <at> yahoo.co.in>
> writes:
> 
> (Please do not use tabs  when sending a data sample, these
> must be 
> manually edited)
> 
> V1,V2,V3
> 15,10,4
> 6,4,7
> 10,5,2
> 8,6,6
> 
> This does the work. However, I fear that you are going to
> use it on 
> 100 variables, and I would strongly advice againts
> searching for 
> linear relations
> that way.
> 
> Dieter
> 
> x=read.table("sample.txt",header=T,sep=",")
> nm = names(x)
> for (i in 1:2)
> {
>   for(j in (i+1):3) # note that you need the ()!
>   {
>     formula=
> as.formula(paste(nm[i],"~",nm[j],sep=""))
>     slr=lm(formula, data=x)
>     smr=summary(slr)
>     print(smr)
>   }
> }
> 
> ______________________________________________
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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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