TrackFitting/detail/Gx2fDeltaParams.cpp

0001 // This file is part of the ACTS project.
0002 //
0003 // Copyright (C) 2016 CERN for the benefit of the ACTS project
0004 //
0005 // This Source Code Form is subject to the terms of the Mozilla Public
0006 // License, v. 2.0. If a copy of the MPL was not distributed with this
0007 // file, You can obtain one at https://mozilla.org/MPL/2.0/.
0008
0009 // GX2F backend. One heavy Eigen decomposition per translation unit to keep
0010 // the peak compile memory low.
0011
0012 #include "Acts/TrackFitting/GlobalChiSquareFitterBackend.hpp"
0013
0014 Eigen::VectorXd Acts::Experimental::computeGx2fDeltaParams(
0015     const Acts::Experimental::Gx2fSystem& extendedSystem) {
0016   return extendedSystem.aMatrix().colPivHouseholderQr().solve(
0017       extendedSystem.bVector());
0018 }