Hi everyone, I need your help on ouple of questions. I need to do summation on a three dimensional array.

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Engdaw Chane
Engdaw Chane 2017-11-28
评论： Engdaw Chane 2017-11-28
My array has 59 rows, 77 columns and360 months. I need to get sum of 3 months for all 360 months so that I will have 59*77*120 matrix. What I did is the following;
k=matrix (:,:,1);
for j=1:length(matrix);
sumof3months(:,:,j)=sum(matrix(:,:,k:k+2));
k=k+3
end
Question two
I have 59x77x360 matrix. I need to do integration over the third dimension.
Intmatrix=integral (matrix,1,360)

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Walter Roberson
Walter Roberson 2017-11-28
sumof3months = matrix(:,:,1:3:end) + matrix(:,:,2:3:end) + matrix(:,:,3:3:end);
Intmatrix = trapz(matrix, [], 3);
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