[R] looping through numbered variables

[Bert Gunter]

Have you read "An Introduction to R". If not, please do so before
osting and pay particular attention to the section on indexing. If so,
re-read the sections on indexing.

For a terser exposition, ?"["

-- Bert

On Mon, Aug 27, 2012 at 7:11 AM, Daniel Caro <dcarov at gmail.com> wrote:
> Hello,
>
> This is a beginner question. I am trying to loop through numbered
> variables with "apply" to calculate weighted means. My data is "data",
> the variables are "var1" to "var100", the weight is "weight". The
> command works using
>
> sapply(paste('data$var', 1:100, sep=''), function(x)
> weighted.mean(eval(parse(text=x)), data$weight))
>
> but is there a way to avoid eval(parse())?
>
> Thank you,
> Daniel
>
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-- 

Bert Gunter
Genentech Nonclinical Biostatistics

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