TMatrixConversion.h

/**************************************************************************
 * basf2 (Belle II Analysis Software Framework)                           *
 * Author: The Belle II Collaboration                                     *
 *                                                                        *
 * See git log for contributors and copyright holders.                    *
 * This file is licensed under LGPL-3.0, see LICENSE.md.                  *
 **************************************************************************/
#pragma once
 
#include <tracking/trackFindingCDC/numerics/CovarianceMatrix.h>
 
#include <TMatrixDSymfwd.h>

 
namespace Belle2 {
  namespace TrackFindingCDC {

    struct TMatrixConversion {

      template <int N>
      static CovarianceMatrix<N> fromTMatrix(const TMatrixDSym& tCov);

      template <int N>
      static TMatrixDSym toTMatrix(const CovarianceMatrix<N>& cov);
    };
  }
}

 
#include <TMatrixDSym.h>
 
namespace Belle2 {
  namespace TrackFindingCDC {
 
    template <int N>
    CovarianceMatrix<N> TMatrixConversion::fromTMatrix(const TMatrixDSym& tCov)
    {
      assert(tCov.GetNrows() == N);
      assert(tCov.GetNcols() == N);
      assert(tCov.GetRowLwb() == 0);
      assert(tCov.GetColLwb() == 0);
 
      CovarianceMatrix<N> result;
      for (int i = 0; i < N; ++i) {
        for (int j = 0; j < N; ++j) {
          result(i, j) = tCov(i, j);
        }
      }
      return result;
    }
 
    template <int N>
    TMatrixDSym TMatrixConversion::toTMatrix(const CovarianceMatrix<N>& cov)
    {
      TMatrixDSym result(N);
      for (int i = 0; i < N; ++i) {
        for (int j = 0; j < N; ++j) {
          result(i, j) = cov(i, j);
        }
      }
      return result;
    }
  }
}