Acts::GaussianGridTrackDensity Class Reference

Implements a 1-dim density grid to be filled with track Gaussian distributions. More...

#include <Acts/Vertexing/GaussianGridTrackDensity.hpp>

Classes
struct	Config
	The configuration struct. More...

Public Types
using	MainGridVector = Eigen::Matrix<float, Eigen::Dynamic, 1>
	Type alias for main grid vector storing density values along z-axis.
using	TrackGridVector = Eigen::Matrix<float, Eigen::Dynamic, 1>
	Type alias for track grid vector storing single track density distribution.

Public Member Functions
	GaussianGridTrackDensity (const Config &cfg)
	Constructor with configuration.
std::pair< int, TrackGridVector >	addTrack (const BoundTrackParameters &trk, MainGridVector &mainGrid) const
	Adds a single track to the overall grid density.
const Config &	config () const
	Get the configuration object.
Result< float >	getMaxZPosition (MainGridVector &mainGrid) const
	Returns the z position of maximum track density.
Result< std::pair< float, float > >	getMaxZPositionAndWidth (MainGridVector &mainGrid) const
	Returns the z position of maximum track density and the estimated width.
void	removeTrackGridFromMainGrid (int zBin, const TrackGridVector &trkGrid, MainGridVector &mainGrid) const
	Removes a track from the overall grid density.

Detailed Description

Implements a 1-dim density grid to be filled with track Gaussian distributions.

Each single track is modelled as a 2(!)-dim Gaussian distribution grid in the d0-z0 plane, but only the overlap with the z-axis (i.e. a 1-dim density vector) needs to be calculated. The position of the highest track density (of either a single bin or the sum of a certain region) can be determined. Single tracks can be cached and removed from the overall density.

Member Typedef Documentation

MainGridVector

using Acts::GaussianGridTrackDensity::MainGridVector = Eigen::Matrix<float, Eigen::Dynamic, 1>

Type alias for main grid vector storing density values along z-axis.

TrackGridVector

using Acts::GaussianGridTrackDensity::TrackGridVector = Eigen::Matrix<float, Eigen::Dynamic, 1>

Type alias for track grid vector storing single track density distribution.

Constructor & Destructor Documentation

GaussianGridTrackDensity()

Acts::GaussianGridTrackDensity::GaussianGridTrackDensity ( const Config & cfg )

explicit

Constructor with configuration.

Parameters

cfg	Configuration for track density calculation

Member Function Documentation

addTrack()

std::pair< int, TrackGridVector > Acts::GaussianGridTrackDensity::addTrack	(	const BoundTrackParameters &	trk,
		MainGridVector &	mainGrid ) const

Adds a single track to the overall grid density.

Parameters

trk	The track to be added
mainGrid	The main 1-dim density grid along the z-axis

Returns

A pair storing information about the z-bin position the track was added (int) and the 1-dim density contribution of the track itself

config()

const Config & Acts::GaussianGridTrackDensity::config

(

)

const

Get the configuration object.

Returns

Reference to the configuration

getMaxZPosition()

Result< float > Acts::GaussianGridTrackDensity::getMaxZPosition

(

MainGridVector &

mainGrid

)

const

Returns the z position of maximum track density.

Parameters

mainGrid

The main 1-dim density grid along the z-axis

Returns

The z position of maximum track density

getMaxZPositionAndWidth()

Result< std::pair< float, float > > Acts::GaussianGridTrackDensity::getMaxZPositionAndWidth

(

MainGridVector &

mainGrid

)

const

Returns the z position of maximum track density and the estimated width.

Parameters

mainGrid

The main 1-dim density grid along the z-axis

Returns

The z position of maximum track density and width

removeTrackGridFromMainGrid()

void Acts::GaussianGridTrackDensity::removeTrackGridFromMainGrid	(	int	zBin,
		const TrackGridVector &	trkGrid,
		MainGridVector &	mainGrid ) const

Removes a track from the overall grid density.

Parameters

zBin	The center z-bin position the track needs to be removed from
trkGrid	The 1-dim density contribution of the track
mainGrid	The main 1-dim density grid along the z-axis