UncertainParameterLine2D Class Reference

A parameter line including including an line covariance matrix which is interpreted as located in the support point. More...

#include <UncertainParameterLine2D.h>

Public Member Functions
	UncertainParameterLine2D ()
	Default constructor for ROOT compatibility.
	UncertainParameterLine2D (const ParameterLine2D &parameterLine2D, const LineCovariance &lineCovariance=LineUtil::identity(), const double chi2=0.0, const size_t ndf=0)
	Attaching a covariance matrix to a parameter line.
const ParameterLine2D *	operator-> () const
	Access to the constant interface of the underlying parameter line Allows the user of this "super" class to use the getters and other methods to get inforamation about the line but disallows mutation of internal state.
	operator ParameterLine2D () const
	Downcast to the "super" class.
LineParameters	lineParameters () const
	Getter for the three perigee parameters in the order defined by EPerigeeParameter.h.
void	setLineCovariance (const LineCovariance &lineCovariance)
	Setter for the whole covariance matrix of the line parameters.
const LineCovariance &	lineCovariance () const
	Getter for the whole covariance matrix of the line parameters.
double	covariance (const ELineParameter &iRow, const ELineParameter &iCol) const
	Getter for individual elements of the covariance matrix.
double	variance (const ELineParameter &i) const
	Getter for individual diagonal elements of the covariance matrix.
double	chi2 () const
	Getter for the chi square value of the line fit.
void	setChi2 (const double chi2)
	Setter for the chi square value of the line fit.
std::size_t	ndf () const
	Getter for the number of degrees of freediom used in the line fit.
void	setNDF (std::size_t ndf)
	Setter for the number of degrees of freediom used in the line fit.
void	invalidate ()
	Sets all line parameters to zero including the covariance matrix.
void	reverse ()
	Reverses the direction of flight represented by this line.
UncertainParameterLine2D	reversed () const
	Returns a copy of the line corresponding to the reverse direction of travel.
void	passiveMoveBy (const Vector2D &by)
	Moves the coordinate system by the vector by.
LineJacobian	moveSupportByJacobian (double byAt) const
	Computes the Jacobi matrix for a move of the coordinate system by the given vector.
void	moveSupportBy (double byAt)
	Moves the coordinate system by the vector by and calculates the new line and its covariance matrix.
LineCovariance	movedSupportCovarianceBy (double byAt) const
	Getter for the covariance as if he coordinate system was moved by the given vector.

Private Attributes
ParameterLine2D	m_parameterLine2D
	Memory for the underlying parameter line.
LineCovariance	m_lineCovariance = LineUtil::identity()
	Memory for the 2x2 covariance matrix of the line phi0 and impact parameter relative to the support point.
double	m_chi2 = 0.0
	Memory for the chi square value of the fit of this line.
size_t	m_ndf = 0
	Memory for the number of degrees of freedim of the fit of this line.

Detailed Description

A parameter line including including an line covariance matrix which is interpreted as located in the support point.

Definition at line 24 of file UncertainParameterLine2D.h.

Constructor & Destructor Documentation

UncertainParameterLine2D() [1/2]

UncertainParameterLine2D ( )

inline

Default constructor for ROOT compatibility.

Definition at line 28 of file UncertainParameterLine2D.h.

      {
      }

UncertainParameterLine2D() [2/2]

UncertainParameterLine2D ( const ParameterLine2D &  parameterLine2D, const LineCovariance &  lineCovariance = LineUtil::identity(), const double  chi2 = 0.0, const size_t  ndf = 0  )

inlineexplicit

Attaching a covariance matrix to a parameter line.

Definition at line 33 of file UncertainParameterLine2D.h.

        : m_parameterLine2D(parameterLine2D)
        , m_lineCovariance(lineCovariance)
        , m_chi2(chi2)
        , m_ndf(ndf)
      {
      }

Member Function Documentation

chi2()

double chi2 ( ) const

inline

Getter for the chi square value of the line fit.

Definition at line 100 of file UncertainParameterLine2D.h.

      {
        return m_chi2;
      }

covariance()

double covariance ( const ELineParameter &  iRow, const ELineParameter &  iCol  ) const

inline

Getter for individual elements of the covariance matrix.

Definition at line 88 of file UncertainParameterLine2D.h.

      {
        return lineCovariance()(iRow, iCol);
      }

invalidate()

void invalidate ( )

inline

Sets all line parameters to zero including the covariance matrix.

Definition at line 124 of file UncertainParameterLine2D.h.

      {
        m_parameterLine2D.invalidate();
        m_lineCovariance = LineUtil::identity();
        m_chi2 = 0.0;
        m_ndf = 0;
      }

lineCovariance()

const LineCovariance & lineCovariance ( ) const

inline

Getter for the whole covariance matrix of the line parameters.

Definition at line 82 of file UncertainParameterLine2D.h.

      {
        return m_lineCovariance;
      }

lineParameters()

LineParameters lineParameters ( ) const

inline

Getter for the three perigee parameters in the order defined by EPerigeeParameter.h.

Definition at line 66 of file UncertainParameterLine2D.h.

      {
        using namespace NLineParameterIndices;
        LineParameters result;
        result(c_Phi0) = m_parameterLine2D.tangential().phi();
        result(c_I) = 0;
        return result;
      }

movedSupportCovarianceBy()

LineCovariance movedSupportCovarianceBy ( double  byAt ) const

inline

Getter for the covariance as if he coordinate system was moved by the given vector.

Definition at line 180 of file UncertainParameterLine2D.h.

      {
        LineJacobian jacobian = moveSupportByJacobian(byAt);
        return LineUtil::transported(jacobian, lineCovariance());
      }

moveSupportBy()

void moveSupportBy ( double  byAt )

inline

Moves the coordinate system by the vector by and calculates the new line and its covariance matrix.

Change is inplace.

Definition at line 171 of file UncertainParameterLine2D.h.

      {
        // Move the covariance matrix first to have access to the original parameters
        LineJacobian jacobian = moveSupportByJacobian(byAt);
        LineUtil::transport(jacobian, m_lineCovariance);
        m_parameterLine2D.passiveMoveAtBy(byAt);
      }

moveSupportByJacobian()

LineJacobian moveSupportByJacobian ( double  byAt ) const

inline

Computes the Jacobi matrix for a move of the coordinate system by the given vector.

Definition at line 161 of file UncertainParameterLine2D.h.

      {
        using namespace NLineParameterIndices;
        LineJacobian result = LineUtil::identity();
        result(c_I, c_Phi0) = -byAt * m_parameterLine2D.tangential().norm();
        return result;
      }

ndf()

std::size_t ndf ( ) const

inline

Getter for the number of degrees of freediom used in the line fit.

Definition at line 112 of file UncertainParameterLine2D.h.

      {
        return m_ndf;
      }

operator ParameterLine2D()

operator ParameterLine2D ( ) const

inline

Downcast to the "super" class.

Definition at line 59 of file UncertainParameterLine2D.h.

      {
        return m_parameterLine2D;
      }

operator->()

const ParameterLine2D * operator-> ( ) const

inline

Access to the constant interface of the underlying parameter line Allows the user of this "super" class to use the getters and other methods to get inforamation about the line but disallows mutation of internal state.

This ensures that the parameters are not changed without proper adjustment to the covariance matrix in this class, which can be achieved by the more limited set of methods in this class accessable by normal . method calls

Definition at line 53 of file UncertainParameterLine2D.h.

      {
        return &m_parameterLine2D;
      }

passiveMoveBy()

void passiveMoveBy ( const Vector2D &  by )

inline

Moves the coordinate system by the vector by.

Because the covariance matrix is pinned in the support point it does not change in this move operation

Definition at line 155 of file UncertainParameterLine2D.h.

      {
        m_parameterLine2D.passiveMoveBy(by);
      }

reverse()

void reverse ( )

inline

Reverses the direction of flight represented by this line.

Definition at line 134 of file UncertainParameterLine2D.h.

      {
        m_parameterLine2D.reverse();
        LineUtil::reverse(m_lineCovariance);
      }

reversed()

UncertainParameterLine2D reversed ( ) const

inline

Returns a copy of the line corresponding to the reverse direction of travel.

Definition at line 141 of file UncertainParameterLine2D.h.

      {
        return UncertainParameterLine2D(m_parameterLine2D.reversed(),
                                        LineUtil::reversed(lineCovariance()),
                                        m_chi2,
                                        m_ndf);
      }

setChi2()

void setChi2 ( const double  chi2 )

inline

Setter for the chi square value of the line fit.

Definition at line 106 of file UncertainParameterLine2D.h.

      {
        m_chi2 = chi2;
      }

setLineCovariance()

void setLineCovariance ( const LineCovariance &  lineCovariance )

inline

Setter for the whole covariance matrix of the line parameters.

Definition at line 76 of file UncertainParameterLine2D.h.

      {
        m_lineCovariance = lineCovariance;
      }

setNDF()

void setNDF ( std::size_t  ndf )

inline

Setter for the number of degrees of freediom used in the line fit.

Definition at line 118 of file UncertainParameterLine2D.h.

      {
        m_ndf = ndf;
      }

variance()

double variance ( const ELineParameter &  i ) const

inline

Getter for individual diagonal elements of the covariance matrix.

Definition at line 94 of file UncertainParameterLine2D.h.

      {
        return lineCovariance()(i, i);
      }

Member Data Documentation

m_chi2

double m_chi2 = 0.0

private

Memory for the chi square value of the fit of this line.

Definition at line 195 of file UncertainParameterLine2D.h.

m_lineCovariance

LineCovariance m_lineCovariance = LineUtil::identity()

private

Memory for the 2x2 covariance matrix of the line phi0 and impact parameter relative to the support point.

Definition at line 192 of file UncertainParameterLine2D.h.

m_ndf

size_t m_ndf = 0

private

Memory for the number of degrees of freedim of the fit of this line.

Definition at line 198 of file UncertainParameterLine2D.h.

m_parameterLine2D

ParameterLine2D m_parameterLine2D

private

Memory for the underlying parameter line.

Definition at line 188 of file UncertainParameterLine2D.h.

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

• tracking/trackFindingCDC/geometry/include/UncertainParameterLine2D.h