template<class Function>
class ROOT::Minuit2::FCNGradAdapter< Function >

template wrapped class for adapting to FCNBase signature a IGradFunction

Author: Lorenzo Moneta

Definition at line 35 of file FCNGradAdapter.h.

Public Member Functions
	FCNGradAdapter (const Function &f, double up=1.)

std::vector< double >	G2 (std::vector< double > const &x) const override
	return second derivatives (diagonal of the Hessian matrix)

std::vector< double >	Gradient (std::vector< double > const &v) const override

std::vector< double >	GradientWithPrevResult (std::vector< double > const &v, double previous_grad, double previous_g2, double *previous_gstep) const override

GradientParameterSpace	gradParameterSpace () const override

bool	HasG2 () const override

bool	HasGradient () const override

bool	HasHessian () const override

std::vector< double >	Hessian (std::vector< double > const &x) const override
	compute Hessian. Return Hessian as a std::vector of size(n*n)

double	operator() (const double *v) const

double	operator() (std::vector< double > const &v) const override
	The meaning of the vector of parameters is of course defined by the user, who uses the values of those parameters to calculate their function Value.

void	SetErrorDef (double up) override
	add interface to set dynamically a new error definition Re-implement this function if needed.

template<class Func >
void	SetG2Function (Func f)

template<class Func >
void	SetHessianFunction (Func f)

double	Up () const override
	Error definition of the function.

Public Member Functions inherited from ROOT::Minuit2::FCNBase
virtual	~FCNBase ()=default

virtual double	ErrorDef () const
	Error definition of the function.

Private Attributes
const Function &	fFunc

std::function< std::vector< double >(std::vector< double > const &)	fG2Func )

std::vector< double >	fG2Vec

std::vector< double >	fGrad

std::vector< double >	fHessian

std::function< bool(std::vector< double > const &, double *)	fHessianFunc )

double	fUp

#include <Minuit2/FCNGradAdapter.h>

Inheritance diagram for ROOT::Minuit2::FCNGradAdapter< Function >:

[legend]

Constructor & Destructor Documentation

◆ FCNGradAdapter()

template<class Function >

ROOT::Minuit2::FCNGradAdapter< Function >::FCNGradAdapter	(	const Function &	f,
		double	up = 1. )

inline

Definition at line 38 of file FCNGradAdapter.h.

Member Function Documentation

◆ G2()

template<class Function >

std::vector< double > ROOT::Minuit2::FCNGradAdapter< Function >::G2 ( std::vector< double > const & x ) const

inlineoverridevirtual

return second derivatives (diagonal of the Hessian matrix)

Reimplemented from ROOT::Minuit2::FCNBase.

Definition at line 68 of file FCNGradAdapter.h.

◆ Gradient()

template<class Function >

std::vector< double > ROOT::Minuit2::FCNGradAdapter< Function >::Gradient ( std::vector< double > const & v ) const

inlineoverridevirtual

Reimplemented from ROOT::Minuit2::FCNBase.

Definition at line 47 of file FCNGradAdapter.h.

◆ GradientWithPrevResult()

template<class Function >

std::vector< double > ROOT::Minuit2::FCNGradAdapter< Function >::GradientWithPrevResult	(	std::vector< double > const &	v,
		double *	previous_grad,
		double *	previous_g2,
		double *	previous_gstep ) const

inlineoverridevirtual

Reimplemented from ROOT::Minuit2::FCNBase.

Definition at line 52 of file FCNGradAdapter.h.

◆ gradParameterSpace()

template<class Function >

GradientParameterSpace ROOT::Minuit2::FCNGradAdapter< Function >::gradParameterSpace ( ) const

inlineoverridevirtual

Reimplemented from ROOT::Minuit2::FCNBase.

Definition at line 59 of file FCNGradAdapter.h.

◆ HasG2()

template<class Function >

bool ROOT::Minuit2::FCNGradAdapter< Function >::HasG2 ( ) const

inlineoverridevirtual

Reimplemented from ROOT::Minuit2::FCNBase.

Definition at line 105 of file FCNGradAdapter.h.

◆ HasGradient()

template<class Function >

bool ROOT::Minuit2::FCNGradAdapter< Function >::HasGradient ( ) const

inlineoverridevirtual

Reimplemented from ROOT::Minuit2::FCNBase.

Definition at line 40 of file FCNGradAdapter.h.

◆ HasHessian()

template<class Function >

bool ROOT::Minuit2::FCNGradAdapter< Function >::HasHessian ( ) const

inlineoverridevirtual

Reimplemented from ROOT::Minuit2::FCNBase.

Definition at line 108 of file FCNGradAdapter.h.

◆ Hessian()

template<class Function >

std::vector< double > ROOT::Minuit2::FCNGradAdapter< Function >::Hessian ( std::vector< double > const & x ) const

inlineoverridevirtual

compute Hessian. Return Hessian as a std::vector of size(n*n)

Reimplemented from ROOT::Minuit2::FCNBase.

Definition at line 89 of file FCNGradAdapter.h.

◆ operator()() [1/2]

template<class Function >

double ROOT::Minuit2::FCNGradAdapter< Function >::operator() ( const double * v ) const

inline

Definition at line 43 of file FCNGradAdapter.h.

◆ operator()() [2/2]

template<class Function >

double ROOT::Minuit2::FCNGradAdapter< Function >::operator() ( std::vector< double > const & v ) const

inlineoverridevirtual

The meaning of the vector of parameters is of course defined by the user, who uses the values of those parameters to calculate their function Value.

The order and the position of these parameters is strictly the one specified by the user when supplying the starting values for minimization. The starting values must be specified by the user, either via an std::vector<double> or the MnUserParameters supplied as input to the MINUIT minimizers such as VariableMetricMinimizer or MnMigrad. Later values are determined by MINUIT as it searches for the Minimum or performs whatever analysis is requested by the user.

Parameters

v	function parameters as defined by the user.

Returns: the Value of the function.

See also: MnUserParameters; VariableMetricMinimizer; MnMigrad

Implements ROOT::Minuit2::FCNBase.

Definition at line 42 of file FCNGradAdapter.h.

◆ SetErrorDef()

template<class Function >

void ROOT::Minuit2::FCNGradAdapter< Function >::SetErrorDef ( double )

inlineoverridevirtual

add interface to set dynamically a new error definition Re-implement this function if needed.

Reimplemented from ROOT::Minuit2::FCNBase.

Definition at line 118 of file FCNGradAdapter.h.

◆ SetG2Function()

template<class Function >

template<class Func >

void ROOT::Minuit2::FCNGradAdapter< Function >::SetG2Function ( Func f )

inline

Definition at line 113 of file FCNGradAdapter.h.

◆ SetHessianFunction()

template<class Function >

template<class Func >

void ROOT::Minuit2::FCNGradAdapter< Function >::SetHessianFunction ( Func f )

inline

Definition at line 116 of file FCNGradAdapter.h.

◆ Up()

template<class Function >

double ROOT::Minuit2::FCNGradAdapter< Function >::Up ( ) const

inlineoverridevirtual

Error definition of the function.

MINUIT defines Parameter errors as the change in Parameter Value required to change the function Value by up. Normally, for chisquared fits it is 1, and for negative log likelihood, its Value is 0.5. If the user wants instead the 2-sigma errors for chisquared fits, it becomes 4, as Chi2(x+n*sigma) = Chi2(x) + n*n.

Implements ROOT::Minuit2::FCNBase.

Definition at line 45 of file FCNGradAdapter.h.

Member Data Documentation

◆ fFunc

template<class Function >

const Function& ROOT::Minuit2::FCNGradAdapter< Function >::fFunc

private

Definition at line 121 of file FCNGradAdapter.h.

◆ fG2Func

template<class Function >

std::function<std::vector<double>(std::vector<double> const& ) ROOT::Minuit2::FCNGradAdapter< Function >::fG2Func)

private

Definition at line 127 of file FCNGradAdapter.h.

◆ fG2Vec

template<class Function >

std::vector<double> ROOT::Minuit2::FCNGradAdapter< Function >::fG2Vec

mutableprivate

Definition at line 125 of file FCNGradAdapter.h.

◆ fGrad

template<class Function >

std::vector<double> ROOT::Minuit2::FCNGradAdapter< Function >::fGrad

mutableprivate

Definition at line 123 of file FCNGradAdapter.h.

◆ fHessian

template<class Function >

std::vector<double> ROOT::Minuit2::FCNGradAdapter< Function >::fHessian

mutableprivate

Definition at line 124 of file FCNGradAdapter.h.

◆ fHessianFunc

template<class Function >

std::function<bool(std::vector<double> const& , double *) ROOT::Minuit2::FCNGradAdapter< Function >::fHessianFunc)

mutableprivate

Definition at line 128 of file FCNGradAdapter.h.

◆ fUp

template<class Function >

double ROOT::Minuit2::FCNGradAdapter< Function >::fUp

private

Definition at line 122 of file FCNGradAdapter.h.

math/minuit2/inc/Minuit2/FCNGradAdapter.h

Public Member Functions

Private Attributes

Constructor & Destructor Documentation

◆ FCNGradAdapter()

Member Function Documentation

◆ G2()

◆ Gradient()

◆ GradientWithPrevResult()

◆ gradParameterSpace()

◆ HasG2()

◆ HasGradient()

◆ HasHessian()

◆ Hessian()

◆ operator()() [1/2]

◆ operator()() [2/2]

◆ SetErrorDef()

◆ SetG2Function()

◆ SetHessianFunction()

◆ Up()

Member Data Documentation

◆ fFunc

◆ fG2Func

◆ fG2Vec

◆ fGrad

◆ fHessian

◆ fHessianFunc

◆ fUp