Matrix Manipulation

2011 11 19

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更新时间：2021 8 20

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Hello everyone!

I am a layman for Matlab, so please forgive me if the question sounds naive. Here is my question. Let's say I have a 3x3 matrix called X:

X = [1 2 3;4 5 6; 7 8 9]

I would like to generate a new matrix Z from X such that every cell Z(i,j) will be defined as follows:

Z(i,j) = X(i,k)*X(k,j) .

where the total number of X cells which are multiplied depends on the length of the matrix.

For example, the first cell of Z will be Z(1,1) = X(1,2)*X(2,1) * X(1,3)*X(3,1)* X(1,1)*X(1,1).

Can any one tell me how to code this in matlab?

Thanks! A.

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Andrei Bobrov 2011-11-19

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Z = prod(bsxfun(@times,permute(X,[1 3 2]),permute(X,[3 2 1])),3);

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