 The centre/pivot of the node.</dd><dd><code>distanceFunction</code> - The distance function to use to 
 calculate the radius.</dd>
<dt><span class="strong">Returns:</span></dt><dd>The radius of the node.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.Exception</code> - If there is some problem calculating the 
 radius.</dd></dl>
</li>
</ul>
<a name="calcPivot(weka.core.neighboursearch.balltrees.BallNode, weka.core.neighboursearch.balltrees.BallNode, weka.core.Instances)">
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