Sum subarrays of a Matrix.

Hi Matlabsolutions community! Could someone give me a hand?

I’m having trouble trying to sum parts of the arrays of a matrix. Let’s say I have the following matrix A of r rows and c columns (rxc).

`A = [1,2,3,4,5,6,7,8,9; 10,11,12,13,14,15,16,17,18; 19,20,21,22,23,24,25,26,27]`

And what I would like to to is to divide each array in n subarrays (n=3) and sum each of those subarrays. In this case, it would be the sum of every three positions. Getting an output suchs as:

out = [5,15,24; 33,42,51; 60,69,78]

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One-liner

`transpose(reshape(sum(reshape(A',3,[])),3,[]))`

Or

`transpose(cell2mat(cellfun(@sum,mat2cell(A',[3,3,3],3),'unif',0)))`

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Simple! That is me, a simple person. I am passionate about knowledge and reading. That’s why I have decided to write and share a bit of my life and thoughts to.