> library(fortunes)
> fortune('parse')
If the answer is parse() you should usually rethink the question.
-- Thomas Lumley
R-help (February 2005)
>
On Mon, May 17, 2010 at 5:08 AM, Stefan Petersson <
stefan.peters...@inizio.se> wrote:
> >
> >
> > I'm trying to dynamically build variable names to use on a list. Let's
> say I
> have a list like this one:
> >
> > l <- list(V1_1=c(1,2,3), V1_2=c('One','Two','Three'))
> >
> > And I succesfully build my variable name like this:
> >
> > paste('l$', 'V1_1', sep='')
> >
> > Why can't I just run a mean call with the pasted variable name?
> >
> > mean(paste('l$', 'V1_1', sep=''))
> >
> > So, my question is; How do one build variable names dynamically to be
> able to
> use them on an R list.
> >
>
> I found a solution. After three days of banging my head, it just took me
> three
> minutes after I posted.
>
> mean(unclass(eval(parse(text=paste('d$', 'V1_1', sep='')))))
>
> I have no idea if this is considered 'good R coding'. It works, but I would
> appreciate comments never the less...
>
> ______________________________________________
> R-help@r-project.org mailing list
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>
--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem that you are trying to solve?
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