Adjacency Matrix/Examples/Digraph

Example of Adjacency Matrix
The adjacency matrix for a directed graph is no longer symmetrical about the main diagonal:

$\qquad \begin{pmatrix} 0 & 1 & 0 & 1 \\ 0 & 0 & 0 & 1 \\ 0 & 0 & 0 & 0 \\ 1 & 0 & 1 & 0 \\ \end{pmatrix}$