Chi2MeasurementEstimatorForTrackerHits Class Reference

#include <Chi2MeasurementEstimatorForTrackerHits.h>

Inheritance diagram for Chi2MeasurementEstimatorForTrackerHits:

List of all members.

Public Member Functions
	Chi2MeasurementEstimatorForTrackerHits (double maxChi2, double nSigma=3.)
	Chi2MeasurementEstimatorForTrackerHits (const Chi2MeasurementEstimatorBase &est)
void	clearCache ()
virtual Chi2MeasurementEstimatorForTrackerHits *	clone () const
virtual std::pair< bool, double >	estimate (const TrajectoryStateOnSurface &, const TransientTrackingRecHit &) const
Private Attributes
bool	cacheUpToDate_
AlgebraicSymMatrix22	tsosMeasuredError_
AlgebraicVector2	tsosMeasuredParameters_

---

Detailed Description

A Chi2 Measurement Estimator. Computhes the Chi^2 of a TrajectoryState with a RecHit or a BoundPlane. The TrajectoryState must have errors. Works for any RecHit dimension.

Definition at line 15 of file Chi2MeasurementEstimatorForTrackerHits.h.

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Constructor & Destructor Documentation

Chi2MeasurementEstimatorForTrackerHits::Chi2MeasurementEstimatorForTrackerHits	(	double	maxChi2,
		double	nSigma = 3.
	)		[inline, explicit]

Construct with cuts on chi2 and nSigma. The cut on Chi2 is used to define the acceptance of RecHits. The errors of the trajectory state are multiplied by nSigma to define acceptance of BoundPlane and maximalLocalDisplacement.

Definition at line 23 of file Chi2MeasurementEstimatorForTrackerHits.h.

Referenced by clone().

                                                                                      : 
    Chi2MeasurementEstimatorBase( maxChi2, nSigma), cacheUpToDate_(false) {}

Chi2MeasurementEstimatorForTrackerHits::Chi2MeasurementEstimatorForTrackerHits

(

const Chi2MeasurementEstimatorBase &

est

)

[inline, explicit]

Definition at line 26 of file Chi2MeasurementEstimatorForTrackerHits.h.

                                                                                           :
        Chi2MeasurementEstimatorBase( est.chiSquaredCut(), est.nSigmaCut()), 
        cacheUpToDate_(false) {}

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Member Function Documentation

void Chi2MeasurementEstimatorForTrackerHits::clearCache

(

)

[inline]

Definition at line 30 of file Chi2MeasurementEstimatorForTrackerHits.h.

References cacheUpToDate_.

{ cacheUpToDate_ = false; }

virtual Chi2MeasurementEstimatorForTrackerHits* Chi2MeasurementEstimatorForTrackerHits::clone

(

void

)

const [inline, virtual]

Implements MeasurementEstimator.

Definition at line 35 of file Chi2MeasurementEstimatorForTrackerHits.h.

References Chi2MeasurementEstimatorForTrackerHits().

                                                                {
    return new Chi2MeasurementEstimatorForTrackerHits(*this);
  }

std::pair< bool, double > Chi2MeasurementEstimatorForTrackerHits::estimate	(	const TrajectoryStateOnSurface &	ts,
		const TransientTrackingRecHit &	hit
	)		const [virtual]

Returns pair( true, value) if the TrajectoryStateOnSurface is compatible with the RecHit, and pair( false, value) if it is not compatible. The TrajectoryStateOnSurface must be on the same Surface as the RecHit. For an estimator where there is no value computed, e.g. fixed window estimator, only the first(bool) part is of interest.

Implements Chi2MeasurementEstimatorBase.

Definition at line 8 of file Chi2MeasurementEstimatorForTrackerHits.cc.

References cacheUpToDate_, invertPosDefMatrix(), TrajectoryStateOnSurface::localError(), TrajectoryStateOnSurface::localParameters(), LocalTrajectoryError::matrix(), TrackingRecHit::parameters(), TrackingRecHit::parametersError(), dttmaxenums::R, alignCSCRings::r, Chi2MeasurementEstimatorBase::returnIt(), tsosMeasuredError_, tsosMeasuredParameters_, and LocalTrajectoryParameters::vector().

                                                      {
        if (!cacheUpToDate_) {
                AlgebraicVector5 par5 = tsos.localParameters().vector();
                tsosMeasuredParameters_[0] = par5[3]; 
                tsosMeasuredParameters_[1] = par5[4]; 
                const AlgebraicSymMatrix55 &err5 = tsos.localError().matrix();
                tsosMeasuredError_ = err5.Sub<AlgebraicSymMatrix22>(3,3);
                cacheUpToDate_ = true;
        }
        AlgebraicVector2     r = asSVector<2>(aRecHit.parameters())      - tsosMeasuredParameters_;
        AlgebraicSymMatrix22 R = asSMatrix<2>(aRecHit.parametersError()) + tsosMeasuredError_;
        invertPosDefMatrix(R);
        return returnIt( ROOT::Math::Similarity(r, R) );
}

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Member Data Documentation

bool Chi2MeasurementEstimatorForTrackerHits::cacheUpToDate_ [mutable, private]

Definition at line 39 of file Chi2MeasurementEstimatorForTrackerHits.h.

Referenced by clearCache(), and estimate().

AlgebraicSymMatrix22 Chi2MeasurementEstimatorForTrackerHits::tsosMeasuredError_ [mutable, private]

Definition at line 41 of file Chi2MeasurementEstimatorForTrackerHits.h.

Referenced by estimate().

AlgebraicVector2 Chi2MeasurementEstimatorForTrackerHits::tsosMeasuredParameters_ [mutable, private]

Definition at line 40 of file Chi2MeasurementEstimatorForTrackerHits.h.

Referenced by estimate().