 function is called by:
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<h2><a name="_source"></a>SOURCE CODE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="fragment"><pre>0001 <a name="_sub0" href="#_subfunctions" class="code">function nfree = num_available</a>
0002 <span class="comment">% num_available --- number of free slots in the graph system</span>
0003 
0004 <span class="keyword">if</span> ~<a href="graph_system_exists.html" class="