private boolean assignToCenters(KDTree tree,
protected boolean assignToCenters(KDTree tree,
  private boolean assignToCenters(KDTree tree,                                  Instances centers, 				  int [][] instOfCent,                                   int [] allInstList,				  int [] assignments,                                  int iterationCount) throws Exception {        boolean converged = true;    if (tree != null) {      // using KDTree structure for assigning      converged = assignToCenters(tree,				  centers, 				  instOfCent,				  assignments,				  iterationCount);    } else {      converged = assignToCenters(centers, 				  instOfCent,				  allInstList, 				  assignments);    }    return converged;  }