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adding rows and storing into a matrix

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zozo
zozo 2012-1-10
Hello,
I have a matrix M of size 2880x501 containing 2880 rows. I want to select the first eight rows and all columns [that is, (1:8,:) ], add them and store the resulting row vector(1x501) in a variable 'out'. Then select the next 8 rows, add them and store the resulting row vector(again 1x501) into above variable 'out' and so on....
Finally, I shall have 360 combinations (of 8 rows each) and all these values should be stored in a single variable as
out(360x501)
Please help me achieve this.

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Michael
Michael 2012-1-10
This may be possible without a loop but I don't have the knowledge, however you can loop over i:
for i = 1:360;
out(i,:) = sum(M((i-1)*8+1 : i*8, :));
end
sum automatically operates on the matrix M(1:8,:) and returns the 1x501 vector of sums down the columns.

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