[R] how to evaluate a dynamic variable?

[Bobby Prill]

Mark,

You're right.  Thank you.  Look, it works:

 > a = c(1,2,3)
 > a
[1] 1 2 3

 > b = "a"
 > b
[1] "a"

 > get(b)
[1] 1 2 3


On Apr 27, 2007, at 5:05 PM, Leeds, Mark (IED) wrote:

> check out get using ?get. I'm not an expert but that might help or
> work.
>
>
>
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Bobby Prill
> Sent: Friday, April 27, 2007 4:35 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] how to evaluate a dynamic variable?
>
> Please help me evaluate a "dynamic variable" as show in the code  
> snippet
> below.
>
> # regular variable
> a = c(1,2,3,4)
>
> # dynamic variable set at runtime
> DV = "a"
>
> eval(DV)
> --> a
>
> eval(eval(DV))
> --> a
>
> # what I want
> something_goes_here(DV)
> -->  1,2,3,4
>
> Can someone teach me how to do this?  Thanks very much.
>
> - Bobby
>
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