private double [] distortion(int[][] instOfCent, Instances centers)
protected double[] distortion(int[][] instOfCent, Instances centers)
  private double [] distortion(int[][] instOfCent, Instances centers)     throws Exception {    double [] distortion = new double [centers.numInstances()];    for (int i = 0; i < centers.numInstances(); i++) {      distortion[i] = 0.0;      for (int j = 0; j < instOfCent[i].length; j++) {	distortion[i] += m_DistanceF.distance(                                 m_Instances.instance(instOfCent[i][j]), 				 centers.instance(i));      }    }    /* diff not done in x-means    res *= 1.0 / (count - centers.numInstances());    */    return distortion;  }