Marlin 3D Printer Firmware Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
Based on Sprinter and grbl. Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/. Incremental Least Squares Best Fit By Roxy and Ed Williams
This algorithm is high speed and has a very small code footprint. Its results are identical to both the Iterative Least-Squares published earlier by Roxy and the QR_SOLVE solution. If used in place of QR_SOLVE it saves roughly 10K of program memory. And even better... the data fed into the algorithm does not need to all be present at the same time. A point can be probed and its values fed into the algorithm and then discarded.
1.8.16 
