Dear List, I have two data.frame of the following form:
A: n V1 V2 1 12 0 2 10 8 3 3 8 4 8 4 6 7 3 7 12 0 8 1 0 9 18 0 10 1 0 13 2 0 B: n V1 V2 1 0 2 2 0 3 3 1 9 4 12 8 5 2 9 6 2 9 8 2 0 10 4 1 11 7 1 12 0 1 Now I want to merge those frame to one data.frame with summing up the columns V1 and V2 but not the column n. So the result in this example would be: AB: n V1 V2 1 12 2 2 10 11 3 4 17 4 20 12 5 2 9 6 9 12 7 12 0 8 3 0 9 18 0 10 5 1 11 7 1 12 0 1 13 2 0 So Columns V1 and V2 are the sum of A und B while n has its old value. Notice that there are different rows in n of A and B. I don't have a clue how to start here. Any hint is welcome. Thanks Dubravko Dolic Munich Germany ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html