Hello,
Try
sapply(seq_len(ncol(mt2)), function(j) mt1[mt2[, j], j])
Hope this helps,
Rui Barradas
Em 12-06-2012 17:19, Zhenjiang Lan escreveu:
mt1:
[,1] [,2] [,3]
[1,] "G" "A" "A"
[2,] "C" "T" "C"
mt2:
[,1] [,2] [,3]
[1,] 1 2 2
[2,] 2 1 2
[3,] 2 2 2
[4,] 1 1 1
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