PerigeeUtil Struct Reference

Utility struct for functions and types related to the perigee parameters. More...

#include <PerigeeParameters.h>

Inheritance diagram for PerigeeUtil:

Collaboration diagram for PerigeeUtil:

Public Types
using	EParamaters = EPerigeeParameter
	Indices of the parameters.
using	ParameterVector = TrackFindingCDC::ParameterVector< c_N >
	The vector type representing the n related parameters.
using	CovarianceMatrix = TrackFindingCDC::CovarianceMatrix< c_N >
	The matrix type representing the covariance of the n related parameters.
using	PrecisionMatrix = TrackFindingCDC::PrecisionMatrix< c_N >
	The matrix type representing the precision of the n related parameters.
using	JacobianMatrix = TrackFindingCDC::JacobianMatrix< c_N >
	The matrix type used to translate covariances and precisions im auto mapping of the parameter space.

Static Public Member Functions
static ParameterVector	reversalSigns ()
	Getter for the signs which have to be applied to reverse the traversal direction.
static double	average (const PerigeeUtil::ParameterVector &fromPar, const PerigeeUtil::CovarianceMatrix &fromCov, const PerigeeUtil::ParameterVector &toPar, const PerigeeUtil::CovarianceMatrix &toCov, PerigeeUtil::ParameterVector &avgPar, PerigeeUtil::CovarianceMatrix &avgCov)
	Calculates the weighted average between two perigee parameter sets with their respective covariance matrix. More...
static void	transport (const JacobianMatrix &jacobian, CovarianceMatrix &cov)
	Transport the covariance matrix inplace with the given jacobian matrix.
static CovarianceMatrix	transported (const JacobianMatrix &jacobian, const CovarianceMatrix &cov)
	Return a copy of the covariance matrix transported with the given jacobian matrix.
static JacobianMatrix	reversalJacobian ()
	Jacobian matrix needed in the reversal operation of the parameter vector.
static void	reverse (CovarianceMatrix &cov)
	Reverse the covariance matrix inplace.
static CovarianceMatrix	reversed (const CovarianceMatrix &cov)
	Return a copy of the reversed covariance matrix.
static CovarianceMatrix	identity ()
	Returns an identity matrix.
static CovarianceMatrix	covarianceFromPrecision (const PrecisionMatrix &prec)
	Convert the precision matrix to the corresponding covariance matrix.
static PrecisionMatrix	precisionFromCovariance (const CovarianceMatrix &cov)
	Convert the covariance matrix to the corresponding precision matrix.
static CovarianceMatrix	covarianceFromFullPrecision (const PrecisionMatrix &prec)
	Convert the precision matrix to the corresponding covariance matrix. More...
static PrecisionMatrix	precisionFromFullCovariance (const CovarianceMatrix &cov)
	Convert the covariance matrix to the corresponding precision matrix. More...
static AParameterVector	getSubParameterVector (const ParameterVector &par)
	Getter for a sub part of the covariance matrix.
static ACovarianceMatrix	getSubCovarianceMatrix (const CovarianceMatrix &cov)
	Getter for a sub part of the covariance matrix.

Static Public Attributes
static const size_t	c_N
	Number of elements.

Detailed Description

Utility struct for functions and types related to the perigee parameters.

Definition at line 47 of file PerigeeParameters.h.

Member Function Documentation

average()

double average ( const PerigeeUtil::ParameterVector &  fromPar, const PerigeeUtil::CovarianceMatrix &  fromCov, const PerigeeUtil::ParameterVector &  toPar, const PerigeeUtil::CovarianceMatrix &  toCov, PerigeeUtil::ParameterVector &  avgPar, PerigeeUtil::CovarianceMatrix &  avgCov  )

static

Calculates the weighted average between two perigee parameter sets with their respective covariance matrix.

Returns the chi2 value of the average.

Definition at line 19 of file PerigeeParameters.cc.

{
  using namespace NPerigeeParameterIndices;
  PerigeeParameters refPar = (fromPar + toPar) / 2.0;
  refPar(c_Phi0) = AngleUtil::average(fromPar(c_Phi0), toPar(c_Phi0));
 
  PerigeeParameters relFromPar = fromPar - refPar;
  AngleUtil::normalise(relFromPar(c_Phi0));
 
  PerigeeParameters relToPar = toPar - refPar;
  AngleUtil::normalise(relToPar(c_Phi0));
 
  PerigeeParameters relAvgPar;
 
  double chi2 =
    CovarianceMatrixUtil::average(relFromPar, fromCov, relToPar, toCov, relAvgPar, avgCov);
 
  avgPar = relAvgPar + refPar;
  AngleUtil::normalise(avgPar(c_Phi0));
 
  return chi2;
}

covarianceFromFullPrecision()

auto covarianceFromFullPrecision ( const PrecisionMatrix &  prec )

staticinherited

Convert the precision matrix to the corresponding covariance matrix.

Faster version with foreknowledge that the precision is of full rank.

Definition at line 73 of file UncertainParameters.icc.h.

precisionFromFullCovariance()

auto precisionFromFullCovariance ( const CovarianceMatrix &  cov )

staticinherited

Convert the covariance matrix to the corresponding precision matrix.

Faster version with foreknowledge that the precision is of full rank.

Definition at line 79 of file UncertainParameters.icc.h.

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

• tracking/trackFindingCDC/geometry/include/PerigeeParameters.h
• tracking/trackFindingCDC/geometry/src/PerigeeParameters.cc