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Message-ID: <1320314991124-3984909.post@n4.nabble.com> Date: 2011-11-03T10:09:51Z From: Celine Subject: Sum with condition In-Reply-To: <BBE150A2-08FE-4486-A46B-AFFD68069C52@comcast.net> Problem solved, thanks everyone for your help. C?line -- View this message in context: http://r.789695.n4.nabble.com/Sum-with-condition-tp3972839p3984909.html Sent from the R help mailing list archive at Nabble.com.