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 = NULL);
  void invertMatrix(TMatrixDSym& mat, double* determinant = NULL);

  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