CurvilinearTrajectoryError Class Reference

#include <CurvilinearTrajectoryError.h>

Public Types
enum	{ dimension = 5 }
	parameter dimension More...
typedef math::Error< dimension > ::type	MathCovarianceMatrix
	5 parameter covariance matrix More...

Public Member Functions
	CurvilinearTrajectoryError ()
	CurvilinearTrajectoryError (InvalidError)
	CurvilinearTrajectoryError (const AlgebraicSymMatrix55 &aCovarianceMatrix)
bool	invalid () const
const AlgebraicSymMatrix55 &	matrix () const
	operator const MathCovarianceMatrix & () const
	operator MathCovarianceMatrix ()
void	operator*= (double factor)
bool	posDef () const
bool	valid () const
void	zeroFieldScaling (double factor)

Private Attributes
AlgebraicSymMatrix55	theCovarianceMatrix

Detailed Description

Parametrization of the error matrix in the curvilinear frame. This frame is tangent to the track at the point of definition, with Z_T parallel to the track. X_T is in the global xy plane and points to the left when looking into the direction of the track, and Y_T forms a right-handed frame with X_T and Z_T.

The error along Z_T is therefore zero. The parameters are
sigma^2( charge / abs_momentum)
sigma^2( lambda)
sigma^2( phi)
sigma^2( x_transverse))
sigma^2( y_transverse))

Please note that lambda and phi are defined in the global frame. Lambda is the helix dip angle (pi/2 minus theta (polar angle)), while phi is the angle of inclination with the global x-axis in the transverse (global xy) plane.

Definition at line 27 of file CurvilinearTrajectoryError.h.

Member Typedef Documentation

typedef math::Error<dimension>::type CurvilinearTrajectoryError::MathCovarianceMatrix

5 parameter covariance matrix

Definition at line 33 of file CurvilinearTrajectoryError.h.

Member Enumeration Documentation

anonymous enum

parameter dimension

Enumerator
dimension

Definition at line 31 of file CurvilinearTrajectoryError.h.

{ dimension = 5 };

Constructor & Destructor Documentation

CurvilinearTrajectoryError::CurvilinearTrajectoryError ( )

inline

Definition at line 36 of file CurvilinearTrajectoryError.h.

{}

CurvilinearTrajectoryError::CurvilinearTrajectoryError ( InvalidError  )

inline

Definition at line 38 of file CurvilinearTrajectoryError.h.

References theCovarianceMatrix.

{theCovarianceMatrix(0,0)=-99999.e10;}

CurvilinearTrajectoryError::CurvilinearTrajectoryError ( const AlgebraicSymMatrix55 &  aCovarianceMatrix )

inline

Constructing class from a full covariance matrix. The sequence of the parameters is the same as the one described above.

Definition at line 43 of file CurvilinearTrajectoryError.h.

                                                                            :
    theCovarianceMatrix(aCovarianceMatrix) { }

Member Function Documentation

bool CurvilinearTrajectoryError::invalid ( ) const

inline

Definition at line 46 of file CurvilinearTrajectoryError.h.

References theCovarianceMatrix.

Referenced by valid().

{ return theCovarianceMatrix(0,0)<-1.e10;}

const AlgebraicSymMatrix55& CurvilinearTrajectoryError::matrix ( void  ) const

inline

Returning the covariance matrix.

Definition at line 60 of file CurvilinearTrajectoryError.h.

References theCovarianceMatrix.

Referenced by MuonSeedsAnalyzer::analyze(), HTrack::computePull(), FreeTrajectoryState::createCartesianError(), BasicTrajectoryState::createLocalErrorFromCurvilinearError(), MuonErrorMatrix::divide(), AnalyticalImpactPointExtrapolator::extrapolateSingleState(), AnalyticalTrajectoryExtrapolatorToLine::extrapolateSingleState(), TrackAnalyzer::fillHistosForState(), GsfTrackProducerBase::fillMode(), PerigeeConversions::ftsToPerigeeError(), MatcherUsingTracksAlgorithm::getChi2(), TrajectoryStateAccessor::inversePtError(), FreeTrajectoryState::missingError(), MuonErrorMatrix::multiply(), TSCBLBuilderNoMaterial::operator()(), AnalyticalErrorPropagation::operator()(), operator<<(), TrackCandidateProducer::produce(), SteppingHelixStateInfo::SteppingHelixStateInfo(), and MuonNavigableLayer::trackingRange().

                                             {
    return theCovarianceMatrix;
  }

CurvilinearTrajectoryError::operator const MathCovarianceMatrix & ( ) const

inline

Definition at line 82 of file CurvilinearTrajectoryError.h.

References theCovarianceMatrix.

{ return theCovarianceMatrix; }

CurvilinearTrajectoryError::operator MathCovarianceMatrix ( )

inline

Definition at line 81 of file CurvilinearTrajectoryError.h.

References theCovarianceMatrix.

{ return theCovarianceMatrix; }

void CurvilinearTrajectoryError::operator*= ( double  factor )

inline

Enables the multiplication of the covariance matrix with the scalar "factor".

Definition at line 67 of file CurvilinearTrajectoryError.h.

References theCovarianceMatrix.

                                   {
    theCovarianceMatrix *= factor;
  }

bool CurvilinearTrajectoryError::posDef ( ) const

inline

Definition at line 50 of file CurvilinearTrajectoryError.h.

References theCovarianceMatrix.

                      { 
    return (theCovarianceMatrix(0,0)>=0) && (theCovarianceMatrix(1,1)>=0) && 
      (theCovarianceMatrix(2,2)>=0) && (theCovarianceMatrix(3,3)>=0) && (theCovarianceMatrix(4,4)>=0);
  }

bool CurvilinearTrajectoryError::valid ( ) const

inline

Definition at line 47 of file CurvilinearTrajectoryError.h.

References invalid().

Referenced by FreeTrajectoryState::hasCurvilinearError(), and FreeTrajectoryState::missingError().

{ return !invalid();}

void CurvilinearTrajectoryError::zeroFieldScaling ( double  factor )

inline

Definition at line 71 of file CurvilinearTrajectoryError.h.

References i, j, mathSSE::sqrt(), and theCovarianceMatrix.

Referenced by FreeTrajectoryState::rescaleError().

                                      {
    double root_of_factor = sqrt(factor);
    //scale the 0 indexed covariance by the factor
    for (unsigned int i=1;i!=5;++i)      theCovarianceMatrix(i,0)*=root_of_factor;

    //scale all others by the scared factor
    for (unsigned int i=1;i!=5;++i)  for (unsigned int j=i;j!=5;++j) theCovarianceMatrix(i,j)*=factor;
    //term 0,0 is not scaled at all
  }

Member Data Documentation

AlgebraicSymMatrix55 CurvilinearTrajectoryError::theCovarianceMatrix

private

Definition at line 85 of file CurvilinearTrajectoryError.h.

Referenced by CurvilinearTrajectoryError(), invalid(), matrix(), operator const MathCovarianceMatrix &(), operator MathCovarianceMatrix(), operator*=(), posDef(), and zeroFieldScaling().