Tools.h

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/* Copyright 2008-2010, Technische Universitaet Muenchen,
   Authors: Christian Hoeppner & Sebastian Neubert & Johannes Rauch

   This file is part of GENFIT.

   GENFIT is free software: you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published
   by the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   GENFIT 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 Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with GENFIT.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef genfit_Tools_h
#define genfit_Tools_h

#include <TVectorD.h>
#include <TMatrixD.h>
#include <TMatrixDSym.h>

namespace genfit {
namespace tools {

void invertMatrix(const TMatrixDSym &mat, TMatrixDSym &inv, double *determinant = nullptr);
void invertMatrix(TMatrixDSym &mat, double *determinant = nullptr);

bool transposedForwardSubstitution(const TMatrixD &R, TVectorD &b);
bool transposedForwardSubstitution(const TMatrixD &R, TMatrixD &b, int nCol);
bool transposedInvert(const TMatrixD &R, TMatrixD &inv);

void QR(TMatrixD &A);

void QR(TMatrixD &A, TVectorD &b);

void safeAverage(const TMatrixDSym &C1, const TMatrixDSym &C2, TMatrixDSym &result);

} /* End of namespace tools */
} /* End of namespace genfit */
#endif // genfit_Tools_h