)
                         throws java.lang.Exception</pre>
<div class="block">Calculates the radius of node.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>instList</code> - The indices array containing the indices of the 
 instances inside the node.</dd><dd><code>insts</code> - The actual instances object. instList points to 
 instances in this object.</dd><dd><code>pivot</code> - The centre/pivot of the node.</dd><dd><code>distanceFunction</code> - The distance fuction to use to calc