>if</span> ~<a href="graph_system_exists.html" class="code" title="function tf = graph_system_exists">graph_system_exists</a>
0005     error(<span class="string">'Graph system has not been initialized.'</span>)
0006 <span class="keyword">end</span>
0007 
0008 <span class="keyword">global</span> GRAPH_MAGIC;
0009 max_graphs = GRAPH_MAGIC.ngraphs;</pre></div>
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