marlintpc::rb_Segment Class Reference

Row based segment. More...

#include <RowTripletBasedTrackFinderProcessor.h>

Public Member Functions
	rb_Segment (double, trpListType)
	Construct row based segment from (unused hits of) triplets. More...
	rb_Segment (double, hitListType, unsigned int=1)
	Construct row based segment from (unused) hits in list. More...
	rb_Segment (std::vector< rb_Segment * > segments)
	Construct row based segment from other segments. More...
double	getBzc () const
	Get Bz*c.
int	getFirstRow () const
	Get first row number.
int	getLastRow () const
	Get first last number.
void	getRefPoint (double *) const
	Get reference point. More...
int	getNdf () const
	Get number of degrees of freedom (of segment fit).
double	getChi2 () const
	Get chi2 from segment fit.
void	getPar (double *) const
	Get (all five helix) parameters from segment fit. More...
const hitListType &	getHitList () const
	Get list of hits.
const TVectorD &	getPar () const
	Get parameter vector.
const TMatrixDSym &	getCov () const
	Get covariance matrix.
bool	match (rb_Segment *, const double, const int) const
	Match segment with other segment. More...
bool	match (rb_Hit *, const double) const
	Match segment with unused hit. More...
void	match (hitListType &, hitListType &, const double) const
	Match segment with (list of) unused hits. More...
void	getLCIOStateAtRefPoint (const double *, TVectorD &, TMatrixDSym &) const
	Get segment state at reference point. More...
void	fillRowMap (std::map< int, int > &) const
	Fill row map. More...
int	getId () const
	Get segment ID.
void	setId (int)
	Set segment ID. More...
void	addHit (rb_Hit *)
	Add (unused) hit to segment. More...

Detailed Description

Row based segment.

Is build from (the unused hits) of matching triplets (from equivalence classes) and fitted in XY and ZS (or from other matching segments).

Constructor & Destructor Documentation

marlintpc::rb_Segment::rb_Segment	(	double	Bzc,
		trpListType	triplets
	)

Construct row based segment from (unused hits of) triplets.

Build and fit segments. Corresponding hits are flagged as used.

Parameters

[in]	Bzc	Bz*c
[in]	triplets	list of triplets

References marlintpc::rb_Hit::getRow(), marlintpc::rb_Hit::getUsed(), and marlintpc::rb_Hit::setUsed().

marlintpc::rb_Segment::rb_Segment	(	double	Bzc,
		hitListType	hits,
		unsigned int	maxHitsPerRow = 1
	)

Construct row based segment from (unused) hits in list.

Build and fit segments. Corresponding hits are flagged as used.

Parameters

[in]	Bzc	Bz*c
[in]	hits	list of hits
[in]	maxHitsPerRow	maximum number of hits per row

References marlintpc::rb_Hit::getRow(), marlintpc::rb_Hit::getUsed(), and marlintpc::rb_Hit::setUsed().

marlintpc::rb_Segment::rb_Segment

(

std::vector< rb_Segment * >

segments

)

Construct row based segment from other segments.

Combine segments.

Parameters

[in]

segments

list of segments

Remarks

better do weighted averaging at mid points?

References marlintpc::simpleHelix::getStateAt().

Member Function Documentation

void marlintpc::rb_Segment::addHit

(

rb_Hit *

hit

)

Add (unused) hit to segment.

Keeping row based ordering of hits. Hit is flagged as used.

Parameters

hit	hit to add

References marlintpc::rb_Hit::getRow(), and marlintpc::rb_Hit::setUsed().

Referenced by marlintpc::RowBasedFastHoughTransformationProcessor::processEvent().

void marlintpc::rb_Segment::fillRowMap

(

std::map< int, int > &

rowMap

)

const

Fill row map.

Parameters

[in,out]

rowMap

row map

Referenced by marlintpc::RowBasedFastHoughTransformationProcessor::processEvent().

void marlintpc::rb_Segment::getLCIOStateAtRefPoint	(	const double *	refPos,
		TVectorD &	newPar,
		TMatrixDSym &	newCov
	)		const

Get segment state at reference point.

Propagate track state at point and transform from helix to LCIO representation.

Parameters

[in]	refPos	reference point (X coordinate)
[out]	newPar	parameter vector
[out]	newCov	covariance matrix

References getCov(), getPar(), getRefPoint(), marlintpc::simpleHelix::getStateAt(), and marlintpc::simpleHelix::helixToLCIOJacobian().

void marlintpc::rb_Segment::getPar

(

double *

par

)

const

Get (all five helix) parameters from segment fit.

Parameters

[out]

par

helix parameter (curvature is zero for Bz*c = 0.)

Referenced by match().

void marlintpc::rb_Segment::getRefPoint

(

double *

position

)

const

Get reference point.

Parameters

[out]

position

position of reference point

Referenced by getLCIOStateAtRefPoint(), and match().

bool marlintpc::rb_Segment::match	(	rb_Segment *	seg,
		const double	chi2Cut,
		const int	trpStepSize
	)		const

Match segment with other segment.

Compare the (4 (line) or 5 (helix)) track parameters (at the mid point). The segments must not overlap (in rows) and the (row) gap must be smaller than the average length.

Parameters

[in]	seg	segment to compare with
[in]	chi2Cut	chi2/ndf cut for segment matching
[in]	trpStepSize	triplet step size (=2)

Returns

matching flag

References getCov(), getFirstRow(), getLastRow(), getPar(), getRefPoint(), and marlintpc::simpleHelix::getStateAt().

Referenced by match(), and marlintpc::RowBasedFastHoughTransformationProcessor::processEvent().

bool marlintpc::rb_Segment::match	(	rb_Hit *	hit,
		const double	chi2Cut
	)		const

Match segment with unused hit.

Compare the (2) positional track parameters at the hit with the hit measurements (are zero there) and errors.

Parameters

[in]	hit	hit to compare with
[in]	chi2Cut	chi2 cut for hit matching

Returns

matching flag

References getCov(), marlintpc::simpleHelix::getExpectedPlanePos(), getPar(), marlintpc::rb_Hit::getPhiMeas(), marlintpc::rb_Hit::getPos(), getRefPoint(), marlintpc::simpleHelix::getStateAt(), marlintpc::rb_Hit::getVarXY(), and marlintpc::rb_Hit::getVarZ().

void marlintpc::rb_Segment::match	(	hitListType &	hits,
		hitListType &	matchingHits,
		const double	chi2Cut
	)		const

Match segment with (list of) unused hits.

Parameters

[in]	hits	hits to compare with
[in]	matchingHits	matching hits
[in]	chi2Cut	chi2 cut for hit matching

References match().

void marlintpc::rb_Segment::setId

(

int

id

)

Set segment ID.

Parameters

[in]

id

ID

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The documentation for this class was generated from the following files:

• RowTripletBasedTrackFinderProcessor.h
• RowTripletBasedTrackFinderProcessor.cc