CartesianTrajectoryError.h

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#ifndef _TRACKER_CARTESIANTRAJECTORYERROR_H_
#define _TRACKER_CARTESIANTRAJECTORYERROR_H_

#include "DataFormats/Math/interface/AlgebraicROOTObjects.h"
#include "DataFormats/GeometryCommonDetAlgo/interface/GlobalError.h"

class CartesianTrajectoryError {
public:
// construct
  CartesianTrajectoryError() {}

  CartesianTrajectoryError(const AlgebraicSymMatrix66& aCovarianceMatrix) :
    theCovarianceMatrix(aCovarianceMatrix) { }

// access

  const AlgebraicSymMatrix66 &matrix() const {
    return theCovarianceMatrix;
  }

  void operator *= (double factor) {
    theCovarianceMatrix *= factor;
  }


  const GlobalError position() const {
    return GlobalError( theCovarianceMatrix.Sub<AlgebraicSymMatrix33>(0,0));
  }


private:
  AlgebraicSymMatrix66 theCovarianceMatrix;
};

#endif