LocalTrajectoryError Class Reference

#include <LocalTrajectoryError.h>

Public Member Functions
bool	invalid () const
	LocalTrajectoryError ()
	LocalTrajectoryError (InvalidError)
	LocalTrajectoryError (const AlgebraicSymMatrix55 &aCovarianceMatrix)
	LocalTrajectoryError (float dx, float dy, float dxdir, float dydir, float dpinv)
const AlgebraicSymMatrix55 &	matrix () const
LocalTrajectoryError &	operator*= (double factor)
bool	posDef () const
LocalError	positionError () const
bool	valid () const
const AlgebraicSymMatrix55 &	weightMatrix () const
	~LocalTrajectoryError ()

Private Attributes
AlgebraicSymMatrix55	theCovarianceMatrix
boost::shared_ptr < AlgebraicSymMatrix55 >	theWeightMatrixPtr

Detailed Description

Class providing access to the covariance matrix of a set of relevant parameters of a trajectory in a local, Cartesian frame. The errors provided are:

sigma^2(q/p) : charge (plus or minus one) divided by magnitude of momentum
sigma^2(dxdz) : direction tangent in local xz-plane
sigma^2(dydz) : direction tangent in local yz-plane
sigma^2(x) : local x-coordinate
sigma^2(y) : local y-coordinate

plus the relevant correlation terms.

Definition at line 21 of file LocalTrajectoryError.h.

Constructor & Destructor Documentation

LocalTrajectoryError::LocalTrajectoryError ( )

inline

Definition at line 24 of file LocalTrajectoryError.h.

{}

LocalTrajectoryError::LocalTrajectoryError ( InvalidError  )

inline

Definition at line 26 of file LocalTrajectoryError.h.

References theCovarianceMatrix.

: theCovarianceMatrix(ROOT::Math::SMatrixNoInit()) {theCovarianceMatrix(0,0)=-99999.e10;}

LocalTrajectoryError::~LocalTrajectoryError ( )

inline

Definition at line 28 of file LocalTrajectoryError.h.

{}

LocalTrajectoryError::LocalTrajectoryError ( 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 44 of file LocalTrajectoryError.h.

                                                                     :
    theCovarianceMatrix(aCovarianceMatrix), theWeightMatrixPtr() { }

LocalTrajectoryError::LocalTrajectoryError	(	float	dx,
		float	dy,
		float	dxdir,
		float	dydir,
		float	dpinv
	)

Constructing class from standard deviations of the individual parameters, making the covariance matrix diagonal. The sequence of the input parameters is sigma(x), sigma(y), sigma(dxdz), sigma(dydz), sigma(q/p), but the resulting covariance matrix has the same structure as the one described above.

Definition at line 7 of file LocalTrajectoryError.cc.

References theCovarianceMatrix.

                           : theCovarianceMatrix(), theWeightMatrixPtr()
{
  theCovarianceMatrix(3,3) = dx*dx;
  theCovarianceMatrix(4,4) = dy*dy;
  theCovarianceMatrix(1,1) = dxdir*dxdir;
  theCovarianceMatrix(2,2) = dydir*dydir;
  theCovarianceMatrix(0,0) = dpinv*dpinv;
  
}

Member Function Documentation

bool LocalTrajectoryError::invalid ( ) const

inline

Definition at line 30 of file LocalTrajectoryError.h.

References theCovarianceMatrix.

Referenced by valid().

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

const AlgebraicSymMatrix55& LocalTrajectoryError::matrix ( void  ) const

inline

Returns the covariance matrix.

Definition at line 61 of file LocalTrajectoryError.h.

References theCovarianceMatrix.

Referenced by CollinearFitAtTM2::CollinearFitAtTM2(), TrajectoryStateCombiner::combine(), CollinearFitAtTM::fit(), MuonKinkFinder::getChi2(), SeedMatcher::matchSimTrack(), MeasurementExtractor::measuredError(), operator<<(), TRecHit5DParamConstraint::parametersError(), trajectoryStateTransform::persistentState(), StraightLinePropagator::propagatedState(), ChargeSignificanceTrajectoryFilter::TBC(), Strip1DMeasurementTransformator::trajectoryError(), Tsos2DPhi::Tsos2DPhi(), Tsos2DZed::Tsos2DZed(), Tsos4D::Tsos4D(), GsfMaterialEffectsUpdator::updateState(), VolumeMaterialEffectsUpdator::updateState(), and MaterialEffectsUpdator::updateStateInPlace().

                                             {
    return theCovarianceMatrix;
  }

LocalTrajectoryError& LocalTrajectoryError::operator*= ( double  factor )

inline

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

Definition at line 73 of file LocalTrajectoryError.h.

References V0MonitoringClient_cfi::factor, theCovarianceMatrix, and theWeightMatrixPtr.

                                                     {
    theCovarianceMatrix *= factor;
    if ((theWeightMatrixPtr.get() != 0) && (factor != 0.0)) { (*theWeightMatrixPtr) /= factor; } 
    return *this;
  }

bool LocalTrajectoryError::posDef ( ) const

inline

Definition at line 34 of file LocalTrajectoryError.h.

References theCovarianceMatrix.

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

LocalError LocalTrajectoryError::positionError ( ) const

inline

Returns the two-by-two submatrix of the covariance matrix which yields the local position errors as well as the correlation between them.

Definition at line 83 of file LocalTrajectoryError.h.

References theCovarianceMatrix.

Referenced by ForwardDetLayer::compatible(), Chi2Strip1DEstimator::estimate(), Chi2MeasurementEstimatorBase::estimate(), AlignmentMonitorGeneric::event(), TkPixelMeasurementDet::hasBadComponents(), TRecHit5DParamConstraint::localPositionError(), Chi2MeasurementEstimatorBase::maximalLocalDisplacement(), ForwardMeasurementEstimator::maximalLocalDisplacement(), BarrelMeasurementEstimator::maximalLocalDisplacement(), and trajectoryToResiduals().

                                   {
    return LocalError( theCovarianceMatrix(3,3),theCovarianceMatrix(3,4),
               theCovarianceMatrix(4,4));
  }

bool LocalTrajectoryError::valid ( ) const

inline

Definition at line 31 of file LocalTrajectoryError.h.

References invalid().

{ return !invalid();}

const AlgebraicSymMatrix55 & LocalTrajectoryError::weightMatrix

(

void

)

const

Returns the inverse of covariance matrix.

Definition at line 18 of file LocalTrajectoryError.cc.

References invertPosDefMatrix(), theCovarianceMatrix, theWeightMatrixPtr, and unlikely.

                                                                      {
  if unlikely(theWeightMatrixPtr.get() == 0) {
    theWeightMatrixPtr.reset(new AlgebraicSymMatrix55());
    invertPosDefMatrix(theCovarianceMatrix,*theWeightMatrixPtr);
  }
  return *theWeightMatrixPtr;
}

Member Data Documentation

AlgebraicSymMatrix55 LocalTrajectoryError::theCovarianceMatrix

private

Definition at line 89 of file LocalTrajectoryError.h.

Referenced by invalid(), LocalTrajectoryError(), matrix(), operator*=(), posDef(), positionError(), and weightMatrix().

boost::shared_ptr<AlgebraicSymMatrix55> LocalTrajectoryError::theWeightMatrixPtr

mutableprivate

Definition at line 90 of file LocalTrajectoryError.h.

Referenced by operator*=(), and weightMatrix().