Hello,
Try the following.
mat <- matrix(scan(text = "
1 1 1 1 1 1
2 2 2 2 2 2
3 3 3 3 3 3
5 5 5 5 5 5
2 2 2 2 2 2
3 3 3 3 3 3
6 6 6 6 6 6
2 2 2 2 2 2
3 3 3 3 3 3
1 1 1 1 1 1
2 2 2 2 2 2
3 3 3 3 3 3
"), ncol = 6, byrow = TRUE)
idx <- 1 + (seq_len(nrow(mat)) - 1) %% 3
aggregate(mat, list(idx), mean)
Hope this helps,
Rui Barradas
Em 16-05-2013 07:17, Zilefac Elvis escreveu:
Hello,
I need your help on this matrix:
1 1 1 1 1 1
2 2 2 2 2 2
3 3 3 3 3 3
5 5 5 5 5 5
2 2 2 2 2 2
3 3 3 3 3 3
6 6 6 6 6 6
2 2 2 2 2 2
3 3 3 3 3 3
1 1 1 1 1 1
2 2 2 2 2 2
3 3 3 3 3 3
First three rows represent first simulation, next three rows = second
simulation etc.
I would like to estimate the values in row 1 for example by taking the mean
of rows 1, 4, 7, 10. Do same for all other rows. So the resulting matrix is
3-by-6.
Thanks
Atem.
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