I am familiar with the $\textrm{vec}(A)$ operator, where the columns of a matrix $A$ are stacked into a vector. If my matrix $A$ has zero-entries, is there a standard notation/operator like $\textrm{vec}(A)$, which would similarly stack the columns of $A$ but ignores the zero-entries?
2026-03-25 14:22:30.1774448550
Vectorization of the nonzero entries of a matrix
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