e/Vectorization (mathematics)

Information
has gloss	eng: In mathematics, especially in linear algebra and matrix theory, the vectorization of a matrix is a linear transformation which converts the matrix into a column vector. Specifically, the vectorization of an m×n matrix A, denoted by vec(A), is the mn × 1 column vector obtain by stacking the columns of the matrix A on top of one another:
lexicalization	eng: vectorization
instance of	(noun) (mathematics) a rectangular array of quantities or expressions set out by rows and columns; treated as a single element and manipulated according to rules matrix