e adjacency matrix of a graph.
        </li>
        <li>
          <a href = "gr_adjacency_pointer.m">gr_adjacency_pointer.m</a>,
          returns the adjacency pointer of a graph.
        </li>
        <li>
          <a href = "gr_adjacency_structure.m">gr_adjacency_structure.m</a>,
          returns the adjacency structure of a graph.
        </li>
        <li>
          <a href = "gr_degree.m">gr_degree.m</a>,
          computes the degree of the nodes in a graph.
        </li>
        <li>
          <