ROOT::Minuit2::MnHesse Class Reference

API class for calculating the numerical covariance matrix (== 2x Inverse Hessian == 2x Inverse 2nd derivative); can be used by the user or Minuit itself.

Definition at line 41 of file MnHesse.h.

Public Member Functions
	MnHesse ()
	default constructor with default strategy
	MnHesse (const MnStrategy &stra)
	conctructor with specific strategy
	MnHesse (unsigned int stra)
	constructor with user-defined strategy level
unsigned int	Ncycles () const
	forward interface of MnStrategy
MnUserParameterState	operator() (const FCNBase &, const MnUserParameterState &, unsigned int maxcalls=0) const
	FCN + MnUserParameterState.
void	operator() (const FCNBase &, FunctionMinimum &, unsigned int maxcalls=0) const
	API to use MnHesse after minimization when function minimum is avalilable, otherwise information on the last state will be lost.
MinimumState	operator() (const MnFcn &, const MinimumState &, const MnUserTransformation &, unsigned int maxcalls=0) const
	internal interface
double	TolerG2 () const
double	Tolerstp () const

Private Member Functions
MinimumState	ComputeAnalytical (const FCNBase &, const MinimumState &, const MnUserTransformation &) const
	internal function to compute the Hessian using an analytical computation or externally provided in the FCNBase class
MinimumState	ComputeNumerical (const MnFcn &, const MinimumState &, const MnUserTransformation &, unsigned int maxcalls) const
	internal function to compute the Hessian using numerical derivative computation

Private Attributes
MnStrategy	fStrategy

#include <Minuit2/MnHesse.h>

Constructor & Destructor Documentation

MnHesse() [1/3]

ROOT::Minuit2::MnHesse::MnHesse ( )

inline

default constructor with default strategy

Definition at line 45 of file MnHesse.h.

MnHesse() [2/3]

ROOT::Minuit2::MnHesse::MnHesse ( unsigned int  stra )

inline

constructor with user-defined strategy level

Definition at line 48 of file MnHesse.h.

MnHesse() [3/3]

ROOT::Minuit2::MnHesse::MnHesse ( const MnStrategy &  stra )

inline

conctructor with specific strategy

Definition at line 51 of file MnHesse.h.

Member Function Documentation

ComputeAnalytical()

MinimumState ROOT::Minuit2::MnHesse::ComputeAnalytical ( const FCNBase &  fcn, const MinimumState &  st, const MnUserTransformation &  trafo  ) const

private

internal function to compute the Hessian using an analytical computation or externally provided in the FCNBase class

Definition at line 80 of file MnHesse.cxx.

ComputeNumerical()

MinimumState ROOT::Minuit2::MnHesse::ComputeNumerical ( const MnFcn &  mfcn, const MinimumState &  st, const MnUserTransformation &  trafo, unsigned int  maxcalls  ) const

private

internal function to compute the Hessian using numerical derivative computation

Definition at line 151 of file MnHesse.cxx.

Ncycles()

unsigned int ROOT::Minuit2::MnHesse::Ncycles ( ) const

inline

forward interface of MnStrategy

Definition at line 68 of file MnHesse.h.

operator()() [1/3]

MnUserParameterState ROOT::Minuit2::MnHesse::operator()	(	const FCNBase &	fcn,
		const MnUserParameterState &	state,
		unsigned int	maxcalls = 0
	)		const

FCN + MnUserParameterState.

Definition at line 31 of file MnHesse.cxx.

operator()() [2/3]

void ROOT::Minuit2::MnHesse::operator()	(	const FCNBase &	fcn,
		FunctionMinimum &	min,
		unsigned int	maxcalls = 0
	)		const

API to use MnHesse after minimization when function minimum is avalilable, otherwise information on the last state will be lost.

(It would be needed to re-call the gradient and spend extra useless function calls) The Function Minimum is updated (modified) by adding the Hesse results as last state of minimization

Definition at line 57 of file MnHesse.cxx.

operator()() [3/3]

MinimumState ROOT::Minuit2::MnHesse::operator()	(	const MnFcn &	mfcn,
		const MinimumState &	st,
		const MnUserTransformation &	trafo,
		unsigned int	maxcalls = 0
	)		const

internal interface

Definition at line 67 of file MnHesse.cxx.

TolerG2()

double ROOT::Minuit2::MnHesse::TolerG2 ( ) const

inline

Definition at line 70 of file MnHesse.h.

Tolerstp()

double ROOT::Minuit2::MnHesse::Tolerstp ( ) const

inline

Definition at line 69 of file MnHesse.h.

Member Data Documentation

fStrategy

MnStrategy ROOT::Minuit2::MnHesse::fStrategy

private

Definition at line 80 of file MnHesse.h.

Libraries for ROOT::Minuit2::MnHesse:

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

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