Similar to the AnalyticalGradientCalculator, the ExternalInternalGradientCalculator supplies Minuit with an externally calculated gradient.

The main difference is that ExternalInternalGradientCalculator expects that the external gradient calculator does things in Minuit2-internal parameter space, which means many int2ext and ext2int transformation steps are not necessary. This avoids loss of precision in some cases, where trigonometrically transforming parameters back and forth can lose a few bits of floating point precision on every pass.

Definition at line 30 of file ExternalInternalGradientCalculator.h.

Public Member Functions
	ExternalInternalGradientCalculator (const FCNGradientBase &fcn, const MnUserTransformation &state)

	~ExternalInternalGradientCalculator ()

virtual FunctionGradient	operator() (const MinimumParameters &) const

virtual FunctionGradient	operator() (const MinimumParameters &, const FunctionGradient &) const

Public Member Functions inherited from ROOT::Minuit2::AnalyticalGradientCalculator
	AnalyticalGradientCalculator (const FCNGradientBase &fcn, const MnUserTransformation &state)

	~AnalyticalGradientCalculator ()

virtual bool	CheckGradient () const

Public Member Functions inherited from ROOT::Minuit2::GradientCalculator
virtual	~GradientCalculator ()

Additional Inherited Members
Protected Attributes inherited from ROOT::Minuit2::AnalyticalGradientCalculator
const FCNGradientBase &	fGradCalc

const MnUserTransformation &	fTransformation

#include <Minuit2/ExternalInternalGradientCalculator.h>

Inheritance diagram for ROOT::Minuit2::ExternalInternalGradientCalculator:

[legend]

Constructor & Destructor Documentation

◆ ExternalInternalGradientCalculator()

ROOT::Minuit2::ExternalInternalGradientCalculator::ExternalInternalGradientCalculator	(	const FCNGradientBase &	fcn,
		const MnUserTransformation &	state
	)

inline

Definition at line 33 of file ExternalInternalGradientCalculator.h.

◆ ~ExternalInternalGradientCalculator()

ROOT::Minuit2::ExternalInternalGradientCalculator::~ExternalInternalGradientCalculator ( )

inline

Definition at line 38 of file ExternalInternalGradientCalculator.h.

Member Function Documentation

◆ operator()() [1/2]

FunctionGradient ROOT::Minuit2::ExternalInternalGradientCalculator::operator() ( const MinimumParameters & par ) const

virtual

Reimplemented from ROOT::Minuit2::AnalyticalGradientCalculator.

Definition at line 21 of file ExternalInternalGradientCalculator.cxx.

◆ operator()() [2/2]

FunctionGradient ROOT::Minuit2::ExternalInternalGradientCalculator::operator()	(	const MinimumParameters &	par,
		const FunctionGradient &	functionGradient
	)		const

virtual

Reimplemented from ROOT::Minuit2::AnalyticalGradientCalculator.

Definition at line 45 of file ExternalInternalGradientCalculator.cxx.

Libraries for ROOT::Minuit2::ExternalInternalGradientCalculator: