How to unfold/concatenate a 3D Matrix?

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I have a 3D matrix of 100x21x100 and I want to perform a vertical unfolding, i.e., to get a 10000x21 matrix.
Thanks for your attention.

Accepted Answer

Stephen23 on 10 Jan 2022
Making some guesses about the order you want, where A is your array:
B = reshape(permute(A,[1,3,2]),[],21)

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