docs: public void add(int numPoints, double[] sumPoints, double sumSquaredPoints) {
  		assert (this.sumPoints.length == sumPoints.length);
  		this.numPoints += numPoints;
  		super.setWeight(this.numPoints);
  		for (int i = 0; i < this.sumPoints.length; i++) {
  			this.sumPoints[i] += sumPoints[i];
  		}
  		this.sumSquaredLength += sumSquaredPoints;
  	}