?'[['

What I think you want is:

x <- "V1_1"
mean(l[[x]])

Also you need to look at 'get'.

On Mon, May 17, 2010 at 4:41 AM, Stefan Petersson <
stefan.petersson@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.
>
> -----------------------------------------------------------------------
> > sessionInfo()
> R version 2.11.0 (2010-04-22)
> i486-pc-linux-gnu
>
> locale:
>  [1] LC_CTYPE=en_US.utf8          LC_NUMERIC=C
>  [3] LC_TIME=en_US.utf8           LC_COLLATE=en_US.utf8
>  [5] LC_MONETARY=en_US.utf8       LC_MESSAGES=en_US.utf8
>  [7] LC_PAPER=en_US.utf8          LC_NAME=en_US.utf8
>  [9] LC_ADDRESS=en_US.utf8        LC_TELEPHONE=en_US.utf8
> [11] LC_MEASUREMENT=en_US.utf8    LC_IDENTIFICATION=en_US.utf8
>
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
>
> other attached packages:
> [1] foreign_0.8-40
>
> loaded via a namespace (and not attached):
> [1] tools_2.11.0
>
> ______________________________________________
> 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<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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