 is an n-by-2 array of edges</span>
0006 <span class="comment">% If an end point is larger than the number of vertices, the graph is</span>
0007 <span class="comment">% extended. End points must be positive integers. Loops are ignored.</span>
0008 
0009 <span class="keyword">global</span> GRAPH_MAGIC
0010 n = <a href="nv.html" class="code" title="function n = nv(g)">nv</a>(g);
0011 
0012 
0013 <span class="keyword">if</span> nargin == 3
0014     <span class="keyword">if</span> (i==j) || (i&lt;1) || (j&lt;1)