TGo4FitModelFormula Class Reference

Model object, which uses ROOT TFormula class facility. More...

#include <TGo4FitModelFormula.h>

Inheritance diagram for TGo4FitModelFormula:


Public Member Functions
	TGo4FitModelFormula ()
	Default constructor.
	TGo4FitModelFormula (const char iName, const char iExpressionStr="", Int_t iNPars=0, Bool_t AddAmplitude=kFALSE)
	Create TGo4FitModelFormula object with given names.
virtual	~TGo4FitModelFormula ()
	Destroys TGo4FitModelFormula object.
virtual Bool_t	CanAmplTouch ()
	Signals that ampltide parameter can be removed from or introdeced to object.
const char *	GetExpression ()
	Return formula expression.
void	SetExpression (const char *expr)
	Sets formula expression.
Int_t	GetNumberOfExprPar ()
	Get number of parameters, which can be used in exprssion.
Bool_t	SetNumberOfExprPar (Int_t num)
	Sets number of parameters, which can be used in expression.
void	SetPosParIndex (Int_t naxis, Int_t indx=-1)
void	SetWidthParIndex (Int_t naxis, Int_t indx=-1)
virtual Bool_t	BeforeEval (Int_t ndim)
	Prepares (if necesary) some intermediate variables to be able calculate values of model via EvalN() function.
virtual Double_t	EvalN (const Double_t *v)
	Calculates value of model according current parameters values and provided axes values.
virtual void	AfterEval ()
	Clear buffers, which were created by BeforeEval() method.
virtual void	Print (Option_t *option) const
	Print information on standard output.
Protected Member Functions
virtual Bool_t	Initialize (Int_t UseBuffers=-1)
	Initialize model object.
virtual void	Finalize ()
	Deletes all buffers, created during initialization.
TGo4FitParameter *	GetExprPar (Int_t n)
TString	GetExprParName (Int_t n)
Bool_t	CompileFormula ()
void	CloseFormula ()
virtual Int_t	GetPosParIndex (Int_t naxis)
	Return index of parameter (if exist), which represent position of model for given axis.
virtual Int_t	GetWidthParIndex (Int_t naxis)
	Return index of parameter (if exist), which represent width of model component for given axis.
Protected Attributes
TString	fxExpression
	String, containig formula expression.
TArrayI	fxPosIndex
TArrayI	fxWidthIndex
TFormula *	fxFormula
	formula for evaluation expression in EvalN() method.
Private Attributes
Int_t	Par_ndim
	temporary variable for formula calculation in EvalN() method.

Detailed Description

Model object, which uses ROOT TFormula class facility.

Any kind of one-line expression can be analyzed by TFormula object and evaluated for given set of axis values and set of parameters. TGo4FitModelFormula in constructor creates additional parameters with names "Par0", "Par1" and so on, which can be used in equation and can be optimized. Optionally amplitude parameters with name "Ampl" can be created. In constructor expression, number of additional parameters and using of amplitude parameter should be specified. Fort instance, equation with 3 parameters and amplitude:

TGo4FitModelFormula *f = new TGo4FitModelFormula("Form","(x-Par0)*(y-Par1)*(z-Par2)", 3, kTRUE);

Definition at line 28 of file TGo4FitModelFormula.h.

Constructor & Destructor Documentation

TGo4FitModelFormula::TGo4FitModelFormula ( )

Default constructor.

Definition at line 21 of file TGo4FitModelFormula.cxx.

TGo4FitModelFormula::TGo4FitModelFormula	(	const char *	iName,
		const char *	iExpressionStr = `""`,
		Int_t	iNPars = `0`,
		Bool_t	AddAmplitude = `kFALSE`
	)

Create TGo4FitModelFormula object with given names.

Formula expression and number of parameters can be sets up. All using of amplitude parameter can be invoked.

Definition at line 25 of file TGo4FitModelFormula.cxx.

References GetExprParName(), and TGo4FitComponent::NewParameter().

TGo4FitModelFormula::~TGo4FitModelFormula ( ) [virtual]

Destroys TGo4FitModelFormula object.

Definition at line 34 of file TGo4FitModelFormula.cxx.

References CloseFormula().

Member Function Documentation

virtual Bool_t TGo4FitModelFormula::CanAmplTouch ( ) [inline, virtual]

Signals that ampltide parameter can be removed from or introdeced to object.

Reimplemented from TGo4FitComponent.

Definition at line 50 of file TGo4FitModelFormula.h.

const char* TGo4FitModelFormula::GetExpression ( ) [inline]

Return formula expression.

Definition at line 55 of file TGo4FitModelFormula.h.

References fxExpression.

void TGo4FitModelFormula::SetExpression ( const char * expr ) [inline]

Sets formula expression.

Definition at line 60 of file TGo4FitModelFormula.h.

References fxExpression.

Int_t TGo4FitModelFormula::GetNumberOfExprPar ( )

Get number of parameters, which can be used in exprssion.

Definition at line 38 of file TGo4FitModelFormula.cxx.

References TGo4FitComponent::GetAmplPar(), and TGo4FitParsList::NumPars().

Referenced by GetExprPar(), and SetNumberOfExprPar().

Bool_t TGo4FitModelFormula::SetNumberOfExprPar ( Int_t num )

Sets number of parameters, which can be used in expression.

Definition at line 50 of file TGo4FitModelFormula.cxx.

References GetExprPar(), GetExprParName(), GetNumberOfExprPar(), TGo4FitComponent::NewParameter(), and TGo4FitParsList::RemovePar().

void TGo4FitModelFormula::SetPosParIndex	(	Int_t	naxis,
		Int_t	indx = `-1`
	)

Definition at line 63 of file TGo4FitModelFormula.cxx.

References fxPosIndex.

void TGo4FitModelFormula::SetWidthParIndex	(	Int_t	naxis,
		Int_t	indx = `-1`
	)

Definition at line 73 of file TGo4FitModelFormula.cxx.

References fxWidthIndex.

Bool_t TGo4FitModelFormula::BeforeEval ( Int_t ndim ) [virtual]

Prepares (if necesary) some intermediate variables to be able calculate values of model via EvalN() function.

Number of axis, which will be used in evaluations, should be specified.

Reimplemented from TGo4FitModel.

Definition at line 106 of file TGo4FitModelFormula.cxx.

References CompileFormula(), fxFormula, TGo4FitParsList::GetPar(), TGo4FitModel::NumPars(), and Par_ndim.

Double_t TGo4FitModelFormula::EvalN ( const Double_t * v ) [virtual]

Calculates value of model according current parameters values and provided axes values.

BeforeEval(), EvalN() & AfterEval() virtual methods provides general interface, where user-specific code should be situated.

Reimplemented from TGo4FitModel.

Definition at line 114 of file TGo4FitModelFormula.cxx.

References fxFormula, and Par_ndim.

void TGo4FitModelFormula::AfterEval ( ) [virtual]

Clear buffers, which were created by BeforeEval() method.

Reimplemented from TGo4FitModel.

Definition at line 124 of file TGo4FitModelFormula.cxx.

References CloseFormula().

void TGo4FitModelFormula::Print ( Option_t * option ) const [virtual]

Print information on standard output.

Reimplemented from TGo4FitModel.

Definition at line 133 of file TGo4FitModelFormula.cxx.

References fxExpression, fxPosIndex, fxWidthIndex, and TGo4FitModel::Print().

Bool_t TGo4FitModelFormula::Initialize ( Int_t UseBuffers = -1 ) [protected, virtual]

Initialize model object.

If usage of buffers is specified (UseBuffers>0), method creates a number of buffers for representing model bins for each data, to which model was assign to.

Reimplemented from TGo4FitModel.

Definition at line 100 of file TGo4FitModelFormula.cxx.

References CloseFormula(), CompileFormula(), and TGo4FitModel::Initialize().

void TGo4FitModelFormula::Finalize ( ) [protected, virtual]

Deletes all buffers, created during initialization.

Reimplemented from TGo4FitModel.

Definition at line 128 of file TGo4FitModelFormula.cxx.

References CloseFormula(), and TGo4FitModel::Finalize().

TGo4FitParameter * TGo4FitModelFormula::GetExprPar ( Int_t n ) [protected]