Because the matrix multiplication is associative; the product can be carried with different order, leading to the same result up to round-off error, MMTIMES usings "optimal" order of binary product to reduce the computational effort (probably accuracy is also improved)
The function assumes the cost of the product of (m x n) with (n x p) matrices is (m*n*p). This assumption is typically true for full matrix.
Bruno Luong (2021). mmtimes: matrix chain product (https://www.mathworks.com/matlabcentral/fileexchange/27950-mmtimes-matrix-chain-product), MATLAB Central File Exchange. Retrieved .
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