Hello togehter, i have a litte problem. I have an output data.frame which look like this one: ID 1 10 2 11 3 12 Now I have another data.frame with more than one line for each ID: ID Group Value 1 10 1 10 2 10 2 20 3 10 3 30 4 10 4 40 5 10 5 50 6 11 3 60 7 11 4 70 8 12 4 80 How can i match these two data.frame for the following result: ID 1 2 3 4 5 1 10 10 20 30 40 50 2 11 60 70 3 12 80 -- View this message in context: http://r.789695.n4.nabble.com/match-from-a-data-frame-in-dependence-of-an-ID-tp4687745.html Sent from the R help mailing list archive at Nabble.com.