Acts::SympyStepper::State Struct Reference

State for track parameter propagation. More...

#include <Acts/Propagator/SympyStepper.hpp>

Collaboration diagram for Acts::SympyStepper::State:

Public Member Functions
	State (const Options &optionsIn, MagneticFieldProvider::Cache fieldCacheIn)
	Constructor from the initial bound track parameters.

Public Attributes
Covariance	cov = Covariance::Zero()
	Covariance matrix for error propagation.
bool	covTransport = false
	Covariance matrix (and indicator) associated with the initial error on track parameters.
FreeVector	derivative = FreeVector::Zero()
	The propagation derivative.
MagneticFieldProvider::Cache	fieldCache
	This caches the current magnetic field cell and stays (and interpolates) within it as long as this is valid.
Jacobian	jacobian = Jacobian::Identity()
	The full jacobian of the transport entire transport.
BoundToFreeMatrix	jacToGlobal = BoundToFreeMatrix::Zero()
	Jacobian from local to the global frame.
FreeMatrix	jacTransport = FreeMatrix::Identity()
	Pure transport jacobian part from runge kutta integration.
detail::MaterialEffectsAccumulator	materialEffectsAccumulator
	Accumulator for material effects along the trajectory.
std::size_t	nSteps = 0
	Total number of performed steps.
std::size_t	nStepTrials = 0
	Totoal number of attempted steps.
Options	options
	Configuration options for the stepper.
FreeVector	pars = FreeVector::Zero()
	Internal free vector parameters.
ParticleHypothesis	particleHypothesis = ParticleHypothesis::pion()
	Particle hypothesis.
double	pathAccumulated = 0.
	Accumulated path length state.
double	previousStepSize = 0.
	Last performed step (for overstep limit calculation).
StepperStatistics	statistics
	Statistics of the stepper.
ConstrainedStep	stepSize
	Adaptive step size of the runge-kutta integration.

Detailed Description

State for track parameter propagation.

It contains the stepping information and is provided thread local by the propagator

Constructor & Destructor Documentation

State()

Acts::SympyStepper::State::State	(	const Options &	optionsIn,
		MagneticFieldProvider::Cache	fieldCacheIn )

Constructor from the initial bound track parameters.

Parameters

[in]	optionsIn	is the configuration of the stepper
[in]	fieldCacheIn	is the cache object for the magnetic field

Note

the covariance matrix is copied when needed

Member Data Documentation

fieldCache

MagneticFieldProvider::Cache Acts::SympyStepper::State::fieldCache

This caches the current magnetic field cell and stays (and interpolates) within it as long as this is valid.

See step() code for details.