docs: private void init( List<CalibrationObservation> observations )
  	{
  		int totalPoints = 0;
  		for (int i = 0; i < observations.size(); i++) {
  			totalPoints += observations.get(i).size();
  		}
  
  		A.reshape(2*totalPoints,X.numRows,false);
  		B.reshape(A.numRows,1,false);
  	}