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...tried to use %in% to match id and cond of mews with my.df, but I haven't been able to get it to work. Am I on the right track? What are some other solutions? Thanks for any help. jason -- View this message in context: http://n4.nabble.com/a-vectorized-solution-to-some-simple-dataframe-math-tp1692810p1692810.html Sent from the R help mailing list archive at Nabble.com.