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...ceeds 3 (also will have to handle NAs in the process). The resulting output would look like: x y 1 1 10 2 2 20 3 3 30 4 4 32 5 5 34 Can someone please explain how to do it? Thank you. Ravi -- View this message in context: http://r.789695.n4.nabble.com/Conditionally-adding-a-constant-tp4253049p4253049.html Sent from the R help mailing list archive at Nabble.com.