Vec.m

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Stretches arrays into vectors - useful for situations when the stand- ard (:) syntax is not available. Syntax:

                             A=vec(A)

WARNING: for tensor trains this operation proceeds by stretching eve- ry core of the tensor train. the result is not the same as column-wise matrix stretching (it is an element permutation away from it), but the resulting order of elements is consi- stent with tensor train Kronecker product operation output.