ROOT::Minuit2::ExternalInternalGradientCalculator Class Reference

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)
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)
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
Static Public Member Functions inherited from ROOT::Minuit2::GradientCalculator
static bool	SetParallelOMP (bool doParallel=true)
	Enable parallelization of gradient calculation using OpenMP.
Protected Attributes inherited from ROOT::Minuit2::AnalyticalGradientCalculator
const FCNBase &	fGradFunc
const MnUserTransformation &	fTransformation
Static Protected Attributes inherited from ROOT::Minuit2::GradientCalculator
static bool	fDoParallelOMP = false
	flag to indicate if parallel OpenMP processing is used

#include <Minuit2/ExternalInternalGradientCalculator.h>

Inheritance diagram for ROOT::Minuit2::ExternalInternalGradientCalculator:

Constructor & Destructor Documentation

ExternalInternalGradientCalculator()

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

inline

Definition at line 33 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:

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The documentation for this class was generated from the following files:

• math/minuit2/inc/Minuit2/ExternalInternalGradientCalculator.h
• math/minuit2/src/ExternalInternalGradientCalculator.cxx