Dear R users: > s4 <- seq(length=10, from=1, by=5) > s<-data.frame(s4,s4,s4) I would like to do some modification to s. And I want the form like the following,if it is possible, how should I do? The last column is the sum of previous three column. s4 s4.1 s4.2 sum 1 1 1 2 6 6 3 11 1 12 4 16 6 22 5 21 11 1 33 6 26 16 6 48 7 31 21 11 63 8 36 26 16 78 9 41 31 21 93 10 46 36 26 108
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