I've a Matrix like A =
1 1 1 2 2 2 3 3 3 4 4 4 5 5 5 6 6 6 7 7 7 8 8 8 9 9 9
I want this 9×3 Matrix to become a (9/n)x3 Matrix (n=3) where every third row is added up. The result would then be:
B =
12 12 12 %because 1+4+7
15 15 15 %because 2+5+8
18 18 18 %because 3+6+9
Is there a way e.g. to use sum() or so? I justed a loop over all rows but my actual Matrix contains a lot of data which is why that would take too long…
Thanks a lot!
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