sum slices of 3-d matrix

Question

Paolo 2018-3-24

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https://ww2.mathworks.cn/matlabcentral/answers/390367-sum-slices-of-3-d-matrix

评论： Joss Knight 2018-3-25

Hello, I have a 3-d matrix A(n,m,k) and I would like to sum each others, the slices A(n,m) such that the output is the new matrix B(n,m) = A(n,m,1) + A(n,m,2) + ... + A(n,m,k)

the matrix could be quite huge; so if you could suggest a solution which use the parallel computing toolbox / gpu it would be really useful.

Thank you Best regards, P

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Answer 1

Walter Roberson 2018-3-24

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https://ww2.mathworks.cn/matlabcentral/answers/390367-sum-slices-of-3-d-matrix#answer_311662

B = sum(A, 3)

For large matrices MATLAB will automatically invoke a high performance multithreaded library to do the calculation. You would not be able to get high performance by using the Parallel Computing toolbox.