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product of sum of the elements along the fourth dimension in a 4D matrix

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Athira Surendran
Athira Surendran 2017-1-17
回答： Adam 2017-1-17
Hi, I've a 4D matrix. I want to take the product of sum of the elements along the fourth dimension. Basically i want to do this "ΠΣ" operation.
For example, a(i,j,k,l) is a 4D matrix. I want the sum along fourth dimension for all i,j,k values and store it to a 3D matrix b(i,j,k). Then I want to find the product of all elements along the third dimension in b for all i,j values and store it to a 2D matrix c(i,j).
How to do this? Thanks in advance.

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Adam
Adam 2017-1-17
a = ones( 3, 4, 5, 6 );
b = sum( a, 4 );
c = prod( b, 3 );
seems to do the job

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