samoa-api/src/main/java/org/apache/samoa/moa/clusterers/KMeans.java [100:127]:
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  private static SphereCluster calculateCenter(ArrayList<Cluster> cluster, int dimensions) {
    double[] res = new double[dimensions];
    for (int i = 0; i < res.length; i++) {
      res[i] = 0.0;
    }

    if (cluster.size() == 0) {
      return new SphereCluster(res, 0.0);
    }

    for (Cluster point : cluster) {
      double[] center = point.getCenter();
      for (int i = 0; i < res.length; i++) {
        res[i] += center[i];
      }
    }

    // Normalize
    for (int i = 0; i < res.length; i++) {
      res[i] /= cluster.size();
    }

    // Calculate radius
    double radius = 0.0;
    for (Cluster point : cluster) {
      double dist = distance(res, point.getCenter());
      if (dist > radius) {
        radius = dist;
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samoa-api/src/main/java/org/apache/samoa/moa/clusterers/clustream/Clustream.java [279:306]:
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  private static SphereCluster calculateCenter(ArrayList<Cluster> cluster, int dimensions) {
    double[] res = new double[dimensions];
    for (int i = 0; i < res.length; i++) {
      res[i] = 0.0;
    }

    if (cluster.size() == 0) {
      return new SphereCluster(res, 0.0);
    }

    for (Cluster point : cluster) {
      double[] center = point.getCenter();
      for (int i = 0; i < res.length; i++) {
        res[i] += center[i];
      }
    }

    // Normalize
    for (int i = 0; i < res.length; i++) {
      res[i] /= cluster.size();
    }

    // Calculate radius
    double radius = 0.0;
    for (Cluster point : cluster) {
      double dist = distance(res, point.getCenter());
      if (dist > radius) {
        radius = dist;
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