Thank you, it works. by the way, sometime I guess *apply functions act like loop, because when I apply a complicated function, they run slowly and one by one.
On Tue, Jun 12, 2012 at 3:39 PM, Rui Barradas <ruipbarra...@sapo.pt> wrote: > 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 > > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
