Hi,
I have the following matrix
cc <- matrix (1:21, 3)
cc[,3:4]<- 0
cc
[,1] [,2] [,3] [,4] [,5] [,6] [,7]
[1,] 1 4 0 0 13 16 19
[2,] 2 5 0 0 14 17 20
[3,] 3 6 0 0 15 18 21
and I would like to sum just the values in columns 2, 3 and 4, so to
have something like
1 4 13 16 19
2 5 14 17 20
3 6 15 18 21
Thanks
Lorenzo
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