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
