Non-Unity Variant of Echelon Matrix/Examples/Arbitrary Matrix 1

Examples of Non-Unity Echelon Matrices

 * $\begin {bmatrix}

0 & 1 & 2 & 3 \\ 0 & 0 & 0 & 1 \\ 0 & 0 & 0 & 0 \\ \end {bmatrix} $ is an echelon matrix.