unWvec function

Reverse vectorization operator that restores zeros

unWvec forms a square matrix from a vector of stacked columns where zeros are removed according to impact matrix constraints.

unWvec(Wvector, d, B_constraints)

Arguments

• Wvector: a length $d^2 - n_zeros$ vector where $n_zeros$ is the number of zero entries in the impact matrix.
• d: the number of rows in the square matrix to be formed.

Returns

a $(d x d)$ impact matrix $W$.