with = FALSE will let you use literal column names
On Wed, Apr 24, 2013 at 3:29 PM, Sam Steingold <[email protected]> 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 > 11.0.11300000 > http://www.childpsy.net/ http://ffii.org http://palestinefacts.org > http://openvotingconsortium.org http://camera.org http://jihadwatch.org > The difference between genius and stupidity is that genius has its limits. > _______________________________________________ > datatable-help mailing list > [email protected] > https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help >
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