ActsAlignment::detail Namespace Reference

Classes
class	AlignmentErrorCategory
struct	TrackAlignmentState
	struct to store info needed for track-based alignment More...

Functions
void	resetAlignmentDerivative (Acts::AlignmentToBoundMatrix &alignToBound, AlignmentMask mask)
template<typename traj_t , typename parameters_t = BoundTrackParameters>
TrackAlignmentState	trackAlignmentState (const GeometryContext &gctx, const traj_t &multiTraj, const size_t &entryIndex, const std::pair< ActsDynamicMatrix, std::unordered_map< size_t, size_t >> &globalTrackParamsCov, const std::unordered_map< const Surface *, size_t > &idxedAlignSurfaces, const AlignmentMask &alignMask)

Function Documentation

void ActsAlignment::detail::resetAlignmentDerivative	(	Acts::AlignmentToBoundMatrix &	alignToBound,
		AlignmentMask	mask
	)

Reset some columns of the alignment to bound derivative to zero if the relevant degree of freedom is fixed

Parameters

alignToBound	The alignment to bound parameters derivative
mask	The alignment mask

Definition at line 14 of file AlignmentEngine.cpp.

View newest version in sPHENIX GitHub at line 14 of file AlignmentEngine.cpp

References ACTS_CHECK_BIT, Acts::eAlignmentCenter0, Acts::eAlignmentCenter1, Acts::eAlignmentCenter2, Acts::eAlignmentRotation0, Acts::eAlignmentRotation1, and Acts::eAlignmentRotation2.

Referenced by trackAlignmentState().

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template<typename traj_t , typename parameters_t = BoundTrackParameters>

TrackAlignmentState ActsAlignment::detail::trackAlignmentState	(	const GeometryContext &	gctx,
		const traj_t &	multiTraj,
		const size_t &	entryIndex,
		const std::pair< ActsDynamicMatrix, std::unordered_map< size_t, size_t >> &	globalTrackParamsCov,
		const std::unordered_map< const Surface *, size_t > &	idxedAlignSurfaces,
		const AlignmentMask &	alignMask
	)

Calculate the first and second derivative of chi2 w.r.t. alignment parameters for a single track

Suppose there are n measurements on the track, and m (m<=n) of them are on alignable surface, then (eAlignmentSize*m) alignment parameters will be involved for this particular track, i.e. this track will contribute to at most (eAlignmentSize*m*2) elements of the full chi2 second derivative matrix

Template Parameters

source_link_t	The source link type of the trajectory
parameters_t	The track parameters type

Parameters

gctx	The current geometry context object
multiTraj	The MultiTrajectory containing the trajectory to be investigated
entryIndex	The trajectory entry index
globalTrackParamsCov	The global track parameters covariance for a single track and the starting row/column for smoothed states. This contains all smoothed track states including those non-measurement states. Selection of certain rows/columns for measurement states is needed.
idxedAlignSurfaces	The indexed surfaces to be aligned

Returns

The track alignment state containing fundamental alignment ingredients

Definition at line 105 of file AlignmentEngine.hpp.

View newest version in sPHENIX GitHub at line 105 of file AlignmentEngine.hpp

References ActsAlignment::detail::TrackAlignmentState::alignedSurfaces, ActsAlignment::detail::TrackAlignmentState::alignmentDof, ActsAlignment::detail::TrackAlignmentState::alignmentToChi2Derivative, ActsAlignment::detail::TrackAlignmentState::alignmentToChi2SecondDerivative, ActsAlignment::detail::TrackAlignmentState::alignmentToResidualDerivative, ActsAlignment::detail::TrackAlignmentState::chi2, Acts::eAlignmentSize, Acts::eBoundSize, Acts::eFreeDir0, Acts::MultiTrajectoryHelpers::freeSmoothed(), H, it, ActsAlignment::detail::TrackAlignmentState::measurementCovariance, ActsAlignment::detail::TrackAlignmentState::measurementDim, Acts::MeasurementFlag, ActsAlignment::detail::TrackAlignmentState::projectionMatrix, resetAlignmentDerivative(), ActsAlignment::detail::TrackAlignmentState::residual, ActsAlignment::detail::TrackAlignmentState::residualCovariance, filter::state, writeMapConfig::surface, ActsAlignment::detail::TrackAlignmentState::trackParametersCovariance, and ActsAlignment::detail::TrackAlignmentState::trackParametersDim.

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