@vech—631

Creates a vector from the columns of the given matrix stacked one on top of each other. The vector will have the same number of elements as the source matrix.

Example:

vector v1 = @vec(m1)

Creates a vector from the columns of the lower triangle of the source square matrix o stacked on top of each another. The vector has the same number of elements as the source matrix has in its lower triangle. Example:

vector v1 = @vech(m1)

632—Appendix G. Matrix Reference