search for: jbreichel

Sorry, maybe it's easy but I haven't found anything useful: how can I obtain a list C that contains all the members in the list B that are not in list A? This are lists of nanes, not numbers! Thank you Gabriele Zoppoli, MD Ph.D. Fellow, Experimental and Clinical Oncology and Hematology, University of Genova, Genova, Italy Guest Researcher, LMP, NCI, NIH, Bethesda MD Work: 301-451-8575

Hi all, Another one: Given a data frame with two columns, where the first column (let's call it 'id') has redundant entries, I'd like to get, for each unique value in 'id', a list or vector of all the values from the second column that corresponded to that value. Example: > df <-