sp;instList,
                         <a href="../../../../weka/core/Instances.html" title="class in weka.core">Instances</a>&nbsp;insts)</pre>
<div class="block">Calculates the centroid pivot of a node. The node is given
 in the form of the portion of an indices array that 
 contains the indices of the points inside the node.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>start</code> - The start index marking the start of 
 the portion belonging to the node.</dd><dd><code>end</code> -