template<class FunctionType>
class ROOT::Math::BasicFitMethodFunction< FunctionType >

FitMethodFunction class Interface for objective functions (like chi2 and likelihood used in the fit) In addition to normal function interface provide interface for calculating each data contrinution to the function which is required by some algorithm (like Fumili)

Definition at line 57 of file Fitter.h.

Public Types
enum	Type_t { kUndefined, kLeastSquare, kLogLikelihood }
	enumeration specyfing the possible fit method types More...

typedef FunctionType::BaseFunc	BaseFunction

Public Member Functions
	BasicFitMethodFunction (int dim, int npoint)

virtual	~BasicFitMethodFunction ()
	Virtual Destructor (no operations) More...

virtual unsigned int	NDim () const
	Number of dimension (parameters) . More...

virtual double	DataElement (const double x, unsigned int i, double g=0) const =0
	method returning the data i-th contribution to the fit objective function For example the residual for the least square functions or the pdf element for the likelihood functions. More...

virtual unsigned int	NPoints () const
	return the number of data points used in evaluating the function More...

virtual Type_t	Type () const
	return the type of method, override if needed More...

virtual unsigned int	NCalls () const
	return the total number of function calls (overrided if needed) More...

virtual void	UpdateNCalls () const
	update number of calls More...

virtual void	ResetNCalls ()
	reset number of function calls More...

Private Attributes
unsigned int	fNDim

unsigned int	fNPoints

unsigned int	fNCalls

#include <Fit/Fitter.h>

Inheritance diagram for ROOT::Math::BasicFitMethodFunction< FunctionType >:

Collaboration diagram for ROOT::Math::BasicFitMethodFunction< FunctionType >:

Member Typedef Documentation

template<class FunctionType>

typedef FunctionType::BaseFunc ROOT::Math::BasicFitMethodFunction< FunctionType >::BaseFunction

Definition at line 43 of file FitMethodFunction.h.

Constructor & Destructor Documentation

template<class FunctionType>

ROOT::Math::BasicFitMethodFunction< FunctionType >::BasicFitMethodFunction	(	int	dim,
		int	npoint
	)

inline

Definition at line 49 of file FitMethodFunction.h.

template<class FunctionType>

virtual ROOT::Math::BasicFitMethodFunction< FunctionType >::~BasicFitMethodFunction ( )

inlinevirtual

Virtual Destructor (no operations)

Definition at line 58 of file FitMethodFunction.h.

Member Function Documentation

template<class FunctionType>

virtual double ROOT::Math::BasicFitMethodFunction< FunctionType >::DataElement	(	const double *	x,
		unsigned int	i,
		double *	g = `0`
	)		const

pure virtual

method returning the data i-th contribution to the fit objective function For example the residual for the least square functions or the pdf element for the likelihood functions.

Estimating eventually also the gradient of the data element if the passed pointer is not null

Implemented in ROOT::Fit::Chi2FCN< FunType >, ROOT::Fit::LogLikelihoodFCN< FunType >, and ROOT::Fit::PoissonLikelihoodFCN< FunType >.

Referenced by ROOT::Math::LSResidualFunc::DoEval(), and TFumiliMinimizer::EvaluateFCN().

template<class FunctionType>

virtual unsigned int ROOT::Math::BasicFitMethodFunction< FunctionType >::NCalls ( ) const

inlinevirtual

return the total number of function calls (overrided if needed)

Definition at line 87 of file FitMethodFunction.h.

Referenced by ROOT::Fit::Fitter::GetNCallsFromFCN(), ROOT::Math::GSLNLSMinimizer::Minimize(), ROOT::Math::GSLMinimizer::NCalls(), and ROOT::Math::GSLNLSMinimizer::NCalls().

template<class FunctionType>

virtual unsigned int ROOT::Math::BasicFitMethodFunction< FunctionType >::NDim ( ) const

inlinevirtual