Acts::Experimental::Gx2fSystem Struct Reference

A container to manage all properties of a gx2f system. More...

#include <Acts/TrackFitting/GlobalChiSquareFitter.hpp>

Public Member Functions
	Gx2fSystem (std::size_t nDims)
	Constructor to initialize matrices and vectors to zero based on specified dimensions.
Eigen::MatrixXd &	aMatrix ()
	Accessor for the extended system matrix (mutable version).
const Eigen::MatrixXd &	aMatrix () const
	Accessor for the extended system matrix (const version).
Eigen::VectorXd &	bVector ()
	Accessor for the extended system vector (mutable version).
const Eigen::VectorXd &	bVector () const
	Accessor for the extended system vector (const version).
double &	chi2 ()
	Accessor for the accumulated chi-squared value (mutable version).
double	chi2 () const
	Accessor for the accumulated chi-squared value (const version).
std::size_t	findRequiredNdf ()
	Determines the minimum number of degrees of freedom required for the fit.
bool	isWellDefined ()
	Checks if the system has sufficient degrees of freedom for fitting.
std::size_t &	ndf ()
	Accessor for the number of degrees of freedom (mutable version).
std::size_t	ndf () const
	Accessor for the number of degrees of freedom (const version).
std::size_t	nDims () const
	Accessor for the number of dimensions of the extended system.

Detailed Description

A container to manage all properties of a gx2f system.

This struct manages the mathematical infrastructure for the gx2f. It initializes and maintains the extended aMatrix and extended bVector.

Constructor & Destructor Documentation

Gx2fSystem()

Acts::Experimental::Gx2fSystem::Gx2fSystem ( std::size_t nDims )

explicit

Constructor to initialize matrices and vectors to zero based on specified dimensions.

Parameters

nDims

Number of dimensions for the extended matrix and vector.

Member Function Documentation

aMatrix() [1/2]

Eigen::MatrixXd & Acts::Experimental::Gx2fSystem::aMatrix

(

)

Accessor for the extended system matrix (mutable version).

Returns

Mutable reference to the aMatrix for adding measurement and material contributions

aMatrix() [2/2]

const Eigen::MatrixXd & Acts::Experimental::Gx2fSystem::aMatrix

(

)

const

Accessor for the extended system matrix (const version).

Returns

Const reference to the aMatrix containing measurement and material contributions

bVector() [1/2]

Eigen::VectorXd & Acts::Experimental::Gx2fSystem::bVector

(

)

Accessor for the extended system vector (mutable version).

Returns

Mutable reference to the bVector for adding measurement and material contributions

bVector() [2/2]

const Eigen::VectorXd & Acts::Experimental::Gx2fSystem::bVector

(

)

const

Accessor for the extended system vector (const version).

Returns

Const reference to the bVector containing measurement and material contributions

chi2() [1/2]

double & Acts::Experimental::Gx2fSystem::chi2

(

)

Accessor for the accumulated chi-squared value (mutable version).

Returns

Mutable reference to chi-squared sum for modification during fitting

chi2() [2/2]

double Acts::Experimental::Gx2fSystem::chi2

(

)

const

Accessor for the accumulated chi-squared value (const version).

Returns

Current sum of chi-squared contributions from measurements and material

findRequiredNdf()

std::size_t Acts::Experimental::Gx2fSystem::findRequiredNdf

(

)

Determines the minimum number of degrees of freedom required for the fit.

Automatically deduces the required NDF based on the system configuration. We have only 3 cases, because we always have l0, l1, phi, theta:

• 4: no magnetic field -> q/p is empty
• 5: no time measurement -> time is not fittable
• 6: full fit with all parameters

Returns

Required NDF based on which parameters can be fitted

isWellDefined()

bool Acts::Experimental::Gx2fSystem::isWellDefined

(

)

Checks if the system has sufficient degrees of freedom for fitting.

Returns

True if NDF exceeds the minimum required for the parameter configuration

ndf() [1/2]

std::size_t & Acts::Experimental::Gx2fSystem::ndf

(

)

Accessor for the number of degrees of freedom (mutable version).

Returns

Mutable reference to NDF counter for incrementing during measurement processing

ndf() [2/2]

std::size_t Acts::Experimental::Gx2fSystem::ndf

(

)

const

Accessor for the number of degrees of freedom (const version).

Returns

Current number of degrees of freedom from processed measurements

nDims()

std::size_t Acts::Experimental::Gx2fSystem::nDims

(

)

const

Accessor for the number of dimensions of the extended system.

Returns

Number of dimensions for the aMatrix and bVector (bound parameters + scattering angles)