Logical Matrix/Examples/Loop-Digraph

Example of Logical Matrix

The adjacency matrix for a loop-digraph is a logical matrix:

$\qquad \begin{pmatrix}

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