Hi Steve, Have posted a follow up to your answer here :
http://stats.stackexchange.com/questions/7884/fast-ways-in-r-to-get-the-first-row-of-a-data-frame-grouped-by-an-identifier/7985#7985 Thought it might be of interest on list as it's such a large difference. I realise this probably isn't clear in the documentation or FAQs, so have added todo to make that clearer. Btw, could somebody vote me up please - I have 1 point and can't make comments! Matthew _______________________________________________ datatable-help mailing list [email protected] https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help
