Sum every nth row or array

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Terence Ryan
Terence Ryan 2012-1-30
回答： Aubai 2017-1-20
Hello all,
I have an array which is 150x8192 elements. I want to sum every 4th row of this array, making the new array (150/4)x8192. I am running into issue determining the correct code. I have tried some simple nested for loops, but I always seem to get a new array with the same dimensions (150x8192). Thanks for any suggestions!

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回答（2 个）

Andreas Goser
Andreas Goser 2012-1-30
If this is your matrix
A=rand(150,8192);
Then this is "every 4th row"
A(1:4:end,:);
I am not 100% sure what you meand about "sum every 4th row" and still you have the same number of columns, but something like
sum(A(1:4:end,:),1)
may be what you need.
Aubai
Aubai 2017-1-20

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