> On May 24, 2016, at 2:01 PM, Beatriz <aguitatie...@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 ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.