[datatable-help] variable column names

[Eduard Antonyan]

with = FALSE will let you use literal column names


On Wed, Apr 24, 2013 at 3:29 PM, Sam Steingold <sds at gnu.org> wrote:

> What do I do if I want to operate on several columns?
> E.g.,
> --8<---------------cut here---------------start------------->8---
> length(names(dt)) = 25
> myvars = c("col1","col4","col7")
> myid = "user"
> setkeyv(dt,myid)
> --8<---------------cut here---------------end--------------->8---
> and I want to summarize columns in myvars by myid.
> the point is that nowhere in the code the literal "col4" or "user" may
> appear.
>
> Thanks.
>
> --
> Sam Steingold (http://sds.podval.org/) on Ubuntu 12.10 (quantal) X
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