private static double distance(double[] pointA,double[] pointB){
  double distance=0.0;
  for (int i=0; i < pointA.length; i++) {
    double d=pointA[i] - pointB[i];
    distance+=d * d;
  }
  return Math.sqrt(distance);
}

private static double distance ( double [ ] pointA , double [ ] pointB ) { double distance = 0.0 ; for ( int i = 0 ; i < pointA . length ; i ++ ) { double d = pointA [ i ] - pointB [ i ] ; distance += d * d ; } return Math . sqrt ( distance ) ; }
distance between two vectors .
