Acts::GenericRungeKuttaStepper::State Struct Reference

State for track parameter propagation. More...

#include <Acts/Propagator/GenericRungeKuttaStepper.hpp>

Collaboration diagram for Acts::GenericRungeKuttaStepper::State:

Public Member Functions
	State (const Options &optionsIn, MagneticFieldProvider::Cache fieldCacheIn)
	Constructor from the options and the field cache.

Public Attributes
std::optional< Covariance >	cov
	Covariance matrix for track parameter uncertainties, set if the covariance is transported.
FreeVector	derivative = FreeVector::Zero()
	The propagation derivative.
std::optional< FieldAndGradient >	field
	Magnetic field at the current position, reused as the first stage of the next step.
MagneticFieldProvider::Cache	fieldCache
	This caches the current magnetic field cell and stays (and interpolates) within it as long as this is valid.
bool	fieldHasGradient = false
	Whether field contains the gradient.
BoundToFreeMatrix	jacToGlobal = BoundToFreeMatrix::Zero()
	Jacobian from local to the global frame.
FreeMatrix	jacTransport = FreeMatrix::Identity()
	Pure transport jacobian part from the Runge-Kutta steps.
std::size_t	nSteps = 0
	Total number of performed 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 steps.

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

Constructor from the options and the field cache.

Parameters

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

Member Data Documentation

field

std::optional<FieldAndGradient> Acts::GenericRungeKuttaStepper::State::field

Magnetic field at the current position, reused as the first stage of the next step.

Reset whenever the position is set from outside.