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 FCNBase &fcn, const MnUserTransformation &trafo)

	~ExternalInternalGradientCalculator () override

FunctionGradient	operator() (const MinimumParameters &) const override

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

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

	~AnalyticalGradientCalculator () override

virtual bool	CanComputeG2 () const

virtual bool	CanComputeHessian () const

bool	G2 (const MinimumParameters &, MnAlgebraicVector &) const override
	compute second derivatives (diagonal of Hessian)

bool	Hessian (const MinimumParameters &, MnAlgebraicSymMatrix &) const override
	compute Hessian matrix

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

Additional Inherited Members
Protected Attributes inherited from ROOT::Minuit2::AnalyticalGradientCalculator
const FCNBase &	fGradFunc

const MnUserTransformation &	fTransformation

#include <Minuit2/ExternalInternalGradientCalculator.h>

Inheritance diagram for ROOT::Minuit2::ExternalInternalGradientCalculator:

[legend]

Constructor & Destructor Documentation

◆ ExternalInternalGradientCalculator()

ROOT::Minuit2::ExternalInternalGradientCalculator::ExternalInternalGradientCalculator	(	const FCNBase &	fcn,
		const MnUserTransformation &	trafo
	)

inline

Definition at line 33 of file ExternalInternalGradientCalculator.h.

◆ ~ExternalInternalGradientCalculator()

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

inlineoverride

Definition at line 38 of file ExternalInternalGradientCalculator.h.

Member Function Documentation

◆ operator()() [1/2]

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

overridevirtual

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

overridevirtual

Reimplemented from ROOT::Minuit2::AnalyticalGradientCalculator.

Definition at line 45 of file ExternalInternalGradientCalculator.cxx.

Libraries for ROOT::Minuit2::ExternalInternalGradientCalculator: