[R] Sprintf to call data frame from environment

[David Winsemius]

> On May 24, 2016, at 2:01 PM, Beatriz <aguitatierra at hotmail.com> wrote:
> 
> 
> In my environment I have a data frame called Samples_1.txt.
> From this data frame I need to get variable V1.  My code doesn't work. Thanks!
> 
> 	$V1
> 
> Note: I need to do it in this way because I have the code into a for loop.

You are treating this as if R were a macro processor, which it's not. The only function that lets you pull in a data-object from the store of named objects using a character vector is `get`, so perhaps:

get( sprintf("Samples_%s.txt", 1) )$V1

And if you were considering the next step of hoping to pass a computed item to `$`, then forget that as well, and learn to use `[`.

-- 

David Winsemius
Alameda, CA, USA