All, I don't usually forward S.O. Q&A here, but this one is a bit of a milestone. First time := by group is being used but it's also using grouping by i (rather than by by) with join inherited scope too.
http://stackoverflow.com/questions/11030614/how-to-best-join-one-column-of-a-data-table-with-another-column-of-the-same-data/11037016#11037016 Matthew _______________________________________________ datatable-help mailing list [email protected] https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help
