Inheritance diagram for GraphSysErr::Combiner:

Classes
struct	Observation

struct	Result

Public Types
typedef Double_t(*	Wrapper_t )(Double_t , Double_t )

Public Member Functions
	Combiner ()

virtual	~Combiner ()

virtual Double_t	W (const Observation &r) const =0

virtual Double_t	StepW (Double_t guess, const Observation &r) const =0

virtual Double_t	StepOffset (Double_t guess, const Observation &r) const =0

virtual Double_t	VarTerm (Double_t guess, const Observation &r) const =0

Double_t	ChiTerm (Double_t guess, const Observation &r) const

Double_t	F (Double_t guess, Double_t chi2) const

Double_t	E (UShort_t nIter, Int_t sign, Double_t best, Double_t chi2, Double_t s)

Double_t	X (UShort_t nIter, Double_t lowest, Double_t highest)

Result *	Calculate (UShort_t nIter=50)

virtual Wrapper_t	Wrapper () const =0

TF1 *	MakeF (const Observation &r, Int_t j) const

TLine *	MakeL (TF1 *f) const

void	Draw (Option_t *option="")

	ClassDef (Combiner, 1)

The data store
void	Clear (Option_t *option="")

void	Add (const Observation &r)

void	Add (Double_t x, Double_t el, Double_t eh)

void	Print (Option_t *option="") const

Public Attributes
TClonesArray	fData

Result *	fResult

Detailed Description

Combining measurements

From http://www.slac.stanford.edu/~barlow/java/

Definition at line 4911 of file GraphSysErr.C.

Member Typedef Documentation

typedef Double_t(* GraphSysErr::Combiner::Wrapper_t)(Double_t *, Double_t *)

Definition at line 4913 of file GraphSysErr.C.

Constructor & Destructor Documentation

GraphSysErr::Combiner::Combiner ( )

inline

Constructor

Definition at line 5077 of file GraphSysErr.C.

virtual GraphSysErr::Combiner::~Combiner ( )

inlinevirtual

Virtual destructor

Definition at line 5085 of file GraphSysErr.C.

Member Function Documentation

void GraphSysErr::Combiner::Add ( const Observation & r )

inline

Add an obervation

Parameters

r	Observation

Definition at line 5106 of file GraphSysErr.C.

Referenced by GraphSysErr::Average(), and GraphSysErr::FWHM().

void GraphSysErr::Combiner::Add	(	Double_t	x,
		Double_t	el,
		Double_t	eh
	)

inline

Add an observation

Parameters

x	\( x_i\)
el	\( \sigma_i^-\)
eh	\( \sigma_i^+\)

Definition at line 5117 of file GraphSysErr.C.

Result* GraphSysErr::Combiner::Calculate ( UShort_t nIter = 50 )

inline

Do the calculation

Parameters

nIter How many iterations to do.

Returns: The best estimate of \( x\) and associated errors

Definition at line 5310 of file GraphSysErr.C.

Referenced by GraphSysErr::Average(), and GraphSysErr::FWHM().

Double_t GraphSysErr::Combiner::ChiTerm	(	Double_t	guess,
		const Observation &	r
	)		const

inline

Calculate the contribution variance to the \(\chi^2\) with the guess \( x'\).

\[ t_i(x') = (x' - x_i)^2 / v_i(x') \]

where \( v_i(x')\) is the term variance

Parameters

guess	\( x'\)
r	Obersvation

Returns: \( t(x')\)

Definition at line 5183 of file GraphSysErr.C.

Referenced by F().

GraphSysErr::Combiner::ClassDef	(	Combiner	,
		1
	)

void GraphSysErr::Combiner::Clear ( Option_t * option = "" )

inline

Clear the internal data

Parameters

option Not used

Definition at line 5095 of file GraphSysErr.C.

void GraphSysErr::Combiner::Draw ( Option_t * option = "" )

inline

Definition at line 5382 of file GraphSysErr.C.

Double_t GraphSysErr::Combiner::E	(	UShort_t	nIter,
		Int_t	sign,
		Double_t	best,
		Double_t	chi2,
		Double_t	s
	)

inline

Try to find best error

Parameters

nIter	Number of iterations
sign	Direction (-1 is low, +1 is high)
best	Current best \( x\) value
chi2	\( \chi^2\) of current best \( x\) value
s	Summed weights in the direction

Returns: The error in the chosen direction

Definition at line 5222 of file GraphSysErr.C.

Referenced by Calculate().

Double_t GraphSysErr::Combiner::F	(	Double_t	guess,
		Double_t	chi2
	)		const

inline

Calculate the \( \chi^2(x')\) where \( x'\) is current guess at the observation.

Parameters

guess	Current guess \( x'\)
chi2	Optional old \( \chi^2\) from best \( x\) value

Returns: \( \chi^2(x')\)

Definition at line 5199 of file GraphSysErr.C.

Referenced by Calculate(), and E().

TF1* GraphSysErr::Combiner::MakeF	(	const Observation &	r,
		Int_t	j
	)		const

inline

Make a function that represents to Log-likehood for a given observation.

Parameters

r	Observation
j	Serial number

Returns: Pointer to newly allocated function object

Definition at line 5355 of file GraphSysErr.C.

Referenced by Draw().

TLine* GraphSysErr::Combiner::MakeL ( TF1 * f ) const

inline

Make a line that represents the best found errors

Parameters

f	Log-likelyhood function to make it from

Returns

Definition at line 5372 of file GraphSysErr.C.

Referenced by Draw().

void GraphSysErr::Combiner::Print ( Option_t * option = "" ) const

inline

Print content of the list

Parameters

option not used

Definition at line 5129 of file GraphSysErr.C.

Referenced by GraphSysErr::FWHM().

virtual Double_t GraphSysErr::Combiner::StepOffset	(	Double_t	guess,
		const Observation &	r
	)		const

pure virtual

Calculate the bias.

Returns: \(\delta(x')\)

Implemented in GraphSysErr::LinearVarianceCombiner, and GraphSysErr::LinearSigmaCombiner.

Referenced by X().

virtual Double_t GraphSysErr::Combiner::StepW	(	Double_t	guess,
		const Observation &	r
	)		const

pure virtual

Calculate the weight based on a guess of best \( x'\)

Parameters

guess	Current guess \( x'\)
r	Observation

Returns: \( W(x')\)

Implemented in GraphSysErr::LinearVarianceCombiner, and GraphSysErr::LinearSigmaCombiner.

Referenced by X().

virtual Double_t GraphSysErr::Combiner::VarTerm	(	Double_t	guess,
		const Observation &	r
	)		const

pure virtual

Calculate the contribution variance to the \(\chi^2\) with the guess \(x'\).

Returns: \( v(x')\)

Implemented in GraphSysErr::LinearVarianceCombiner, and GraphSysErr::LinearSigmaCombiner.

Referenced by ChiTerm().

virtual Double_t GraphSysErr::Combiner::W ( const Observation & r ) const

pure virtual

Calculate the weight

Parameters

r	Observation

Returns: \( W\)

Implemented in GraphSysErr::LinearVarianceCombiner, and GraphSysErr::LinearSigmaCombiner.

virtual Wrapper_t GraphSysErr::Combiner::Wrapper ( ) const

pure virtual

Return function pointer to wrapper

Returns: Function pointer

Implemented in GraphSysErr::LinearVarianceCombiner, and GraphSysErr::LinearSigmaCombiner.

Referenced by MakeF().

Double_t GraphSysErr::Combiner::X	(	UShort_t	nIter,
		Double_t	lowest,
		Double_t	highest
	)

inline

Find best estimate of \( x\)

Parameters

nIter	Number of iterations
lowest	Lower bound
highest	Upper bound

Returns: \( x\)

Definition at line 5272 of file GraphSysErr.C.

Referenced by Calculate().

Member Data Documentation

TClonesArray GraphSysErr::Combiner::fData

Definition at line 5071 of file GraphSysErr.C.

Referenced by Add(), Calculate(), Clear(), Combiner(), Draw(), E(), F(), Print(), X(), and ~Combiner().

Result* GraphSysErr::Combiner::fResult

Definition at line 5072 of file GraphSysErr.C.

Referenced by GraphSysErr::Average(), Calculate(), Clear(), Draw(), and ~Combiner().

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

PWGLF/FORWARD/analysis2/gse/GraphSysErr.C

Classes

Public Types

Public Member Functions

Public Attributes

Detailed Description

Member Typedef Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation