Base Minimizer class, which defines the basic funcionality of various minimizer implementations (apart from Minuit and Minuit2) It provides support for storing parameter values, step size, parameter transofrmation etc.

. in case real minimizer impelmentations do not provide such functionality. This is an internal class and should not be used directly by the user

Definition at line 54 of file BasicMinimizer.h.

Public Member Functions
	BasicMinimizer ()
	Default constructor.

virtual	~BasicMinimizer ()
	Destructor.

virtual bool	FixVariable (unsigned int ivar)
	fix an existing variable

virtual bool	GetVariableSettings (unsigned int ivar, ROOT::Fit::ParameterSettings &varObj) const
	get variable settings in a variable object (like ROOT::Fit::ParamsSettings)

const ROOT::Math::IMultiGradFunction *	GradObjFunction () const
	return pointer to used gradient object function (NULL if gradient is not supported)

virtual bool	IsFixedVariable (unsigned int ivar) const
	query if an existing variable is fixed (i.e.

virtual bool	Minimize ()
	method to perform the minimization

virtual double	MinValue () const
	return minimum function value

virtual unsigned int	NDim () const
	number of dimensions

virtual unsigned int	NFree () const
	number of free variables (real dimension of the problem)

virtual unsigned int	NPar () const
	total number of parameter defined

const ROOT::Math::IMultiGenFunction *	ObjFunction () const
	return pointer to used objective function

void	PrintResult () const
	print result of minimization

virtual bool	ReleaseVariable (unsigned int ivar)
	release an existing variable

virtual bool	SetFixedVariable (unsigned int, const std::string &, double)
	set fixed variable (override if minimizer supports them )

virtual void	SetFunction (const ROOT::Math::IMultiGenFunction &func)
	set the function to minimize

virtual void	SetFunction (const ROOT::Math::IMultiGradFunction &func)
	set gradient the function to minimize

virtual bool	SetLimitedVariable (unsigned int ivar, const std::string &name, double val, double step, double, double)
	set upper/lower limited variable (override if minimizer supports them )

virtual bool	SetLowerLimitedVariable (unsigned int ivar, const std::string &name, double val, double step, double lower)
	set lower limit variable (override if minimizer supports them )

virtual bool	SetUpperLimitedVariable (unsigned int ivar, const std::string &name, double val, double step, double upper)
	set upper limit variable (override if minimizer supports them )

virtual bool	SetVariable (unsigned int ivar, const std::string &name, double val, double step)
	set free variable

virtual bool	SetVariableLimits (unsigned int ivar, double lower, double upper)
	set the limits of an already existing variable

virtual bool	SetVariableLowerLimit (unsigned int ivar, double lower)
	set the lower-limit of an already existing variable

virtual bool	SetVariableStepSize (unsigned int ivar, double step)
	set the step size of an already existing variable

virtual bool	SetVariableUpperLimit (unsigned int ivar, double upper)
	set the upper-limit of an already existing variable

virtual bool	SetVariableValue (unsigned int ivar, double val)
	set the value of an existing variable

virtual bool	SetVariableValues (const double *x)
	set the values of all existing variables (array must be dimensioned to the size of existing parameters)

virtual const double *	StepSizes () const
	accessor methods

const ROOT::Math::MinimTransformFunction *	TransformFunction () const
	return transformation function (NULL if not having a transformation)

virtual int	VariableIndex (const std::string &name) const
	get index of variable given a variable given a name return -1 if variable is not found

virtual std::string	VariableName (unsigned int ivar) const
	get name of variables (override if minimizer support storing of variable names)

virtual const double *	X () const
	return pointer to X values at the minimum

Public Member Functions inherited from ROOT::Math::Minimizer
	Minimizer ()
	Default constructor.

virtual	~Minimizer ()
	Destructor (no operations)

virtual void	Clear ()
	reset for consecutive minimizations - implement if needed

virtual bool	Contour (unsigned int ivar, unsigned int jvar, unsigned int &npoints, double xi, double xj)
	find the contour points (xi, xj) of the function for parameter ivar and jvar around the minimum The contour will be find for value of the function = Min + ErrorUp();

virtual double	Correlation (unsigned int i, unsigned int j) const
	return correlation coefficient between variable i and j.

virtual double	CovMatrix (unsigned int ivar, unsigned int jvar) const
	return covariance matrices element for variables ivar,jvar if the variable is fixed the return value is zero The ordering of the variables is the same as in the parameter and errors vectors

virtual int	CovMatrixStatus () const
	return status of covariance matrix using Minuit convention {0 not calculated 1 approximated 2 made pos def , 3 accurate} Minimizer who implements covariance matrix calculation will re-implement the method

virtual double	Edm () const
	return expected distance reached from the minimum (re-implement if minimizer provides it

double	ErrorDef () const
	return the statistical scale used for calculate the error is typically 1 for Chi2 and 0.5 for likelihood minimization

virtual const double *	Errors () const
	return errors at the minimum

virtual bool	GetCovMatrix (double *covMat) const
	Fill the passed array with the covariance matrix elements if the variable is fixed or const the value is zero.

virtual bool	GetHessianMatrix (double *hMat) const
	Fill the passed array with the Hessian matrix elements The Hessian matrix is the matrix of the second derivatives and is the inverse of the covariance matrix If the variable is fixed or const the values for that variables are zero.

virtual bool	GetMinosError (unsigned int ivar, double &errLow, double &errUp, int option=0)
	minos error for variable i, return false if Minos failed or not supported and the lower and upper errors are returned in errLow and errUp An extra flag specifies if only the lower (option=-1) or the upper (option=+1) error calculation is run

virtual double	GlobalCC (unsigned int ivar) const
	return global correlation coefficient for variable i This is a number between zero and one which gives the correlation between the i-th parameter and that linear combination of all other parameters which is most strongly correlated with i.

virtual bool	Hesse ()
	perform a full calculation of the Hessian matrix for error calculation

bool	IsValidError () const
	return true if Minimizer has performed a detailed error validation (e.g. run Hesse for Minuit)

unsigned int	MaxFunctionCalls () const
	max number of function calls

unsigned int	MaxIterations () const
	max iterations

virtual const double *	MinGradient () const
	return pointer to gradient values at the minimum

virtual int	MinosStatus () const
	status code of Minos (to be re-implemented by the minimizers supporting Minos)

virtual unsigned int	NCalls () const
	number of function calls to reach the minimum

virtual unsigned int	NIterations () const
	number of iterations to reach the minimum

virtual MinimizerOptions	Options () const
	retrieve the minimizer options (implement derived class if needed)

double	Precision () const
	precision of minimizer in the evaluation of the objective function ( a value <=0 corresponds to the let the minimizer choose its default one)

int	PrintLevel () const
	minimizer configuration parameters

virtual void	PrintResults ()
	return reference to the objective function virtual const ROOT::Math::IGenFunction & Function() const = 0;

virtual bool	ProvidesError () const
	minimizer provides error and error matrix

virtual bool	Scan (unsigned int ivar, unsigned int &nstep, double x, double y, double xmin=0, double xmax=0)
	scan function minimum for variable i.

void	SetDefaultOptions ()
	reset the defaut options (defined in MinimizerOptions)

void	SetErrorDef (double up)
	set scale for calculating the errors

void	SetMaxFunctionCalls (unsigned int maxfcn)
	set maximum of function calls

void	SetMaxIterations (unsigned int maxiter)
	set maximum iterations (one iteration can have many function calls)

void	SetOptions (const MinimizerOptions &opt)
	set all options in one go

void	SetPrecision (double prec)
	set in the minimizer the objective function evaluation precision ( a value <=0 means the minimizer will choose its optimal value automatically, i.e.

void	SetPrintLevel (int level)
	set print level

void	SetStrategy (int strategyLevel)
	set the strategy

void	SetTolerance (double tol)
	set the tolerance

void	SetValidError (bool on)
	flag to check if minimizer needs to perform accurate error analysis (e.g. run Hesse for Minuit)

virtual bool	SetVariableInitialRange (unsigned int, double, double)
	set the initial range of an existing variable

template<class VariableIterator >
int	SetVariables (const VariableIterator &begin, const VariableIterator &end)
	add variables . Return number of variables successfully added

int	Status () const
	status code of minimizer

int	Strategy () const
	strategy

double	Tolerance () const
	absolute tolerance

Protected Member Functions
bool	CheckDimension () const

bool	CheckObjFunction () const

MinimTransformFunction *	CreateTransformation (std::vector< double > &startValues, const ROOT::Math::IMultiGradFunction *func=0)

void	SetFinalValues (const double *x)

void	SetMinValue (double val)

Private Member Functions
	BasicMinimizer (const BasicMinimizer &)
	Copy constructor.

BasicMinimizer &	operator= (const BasicMinimizer &rhs)
	Assignment operator.

Private Attributes
std::map< unsigned int, std::pair< double, double > >	fBounds

unsigned int	fDim

double	fMinVal

std::vector< std::string >	fNames

const ROOT::Math::IMultiGenFunction *	fObjFunc

std::vector< double >	fSteps

std::vector< double >	fValues

std::vector< ROOT::Math::EMinimVariableType >	fVarTypes

Additional Inherited Members
Protected Attributes inherited from ROOT::Math::Minimizer
MinimizerOptions	fOptions

int	fStatus

bool	fValidError

#include <Math/BasicMinimizer.h>

Inheritance diagram for ROOT::Math::BasicMinimizer:

[legend]

Constructor & Destructor Documentation

◆ BasicMinimizer() [1/2]

ROOT::Math::BasicMinimizer::BasicMinimizer ( )

Default constructor.

Definition at line 43 of file BasicMinimizer.cxx.

◆ ~BasicMinimizer()

ROOT::Math::BasicMinimizer::~BasicMinimizer ( )

virtual

Destructor.

Definition at line 59 of file BasicMinimizer.cxx.

◆ BasicMinimizer() [2/2]

ROOT::Math::BasicMinimizer::BasicMinimizer ( const BasicMinimizer & )

inlineprivate

Copy constructor.

Definition at line 75 of file BasicMinimizer.h.

Member Function Documentation

◆ CheckDimension()

bool ROOT::Math::BasicMinimizer::CheckDimension ( ) const

protected

Definition at line 254 of file BasicMinimizer.cxx.

◆ CheckObjFunction()

bool ROOT::Math::BasicMinimizer::CheckObjFunction ( ) const

protected

Definition at line 263 of file BasicMinimizer.cxx.

◆ CreateTransformation()

MinimTransformFunction * ROOT::Math::BasicMinimizer::CreateTransformation	(	std::vector< double > &	startValues,
		const ROOT::Math::IMultiGradFunction *	func = `0`
	)

protected

Definition at line 272 of file BasicMinimizer.cxx.

◆ FixVariable()

bool ROOT::Math::BasicMinimizer::FixVariable ( unsigned int ivar )

virtual

fix an existing variable

Reimplemented from ROOT::Math::Minimizer.

Definition at line 182 of file BasicMinimizer.cxx.

◆ GetVariableSettings()

bool ROOT::Math::BasicMinimizer::GetVariableSettings	(	unsigned int	ivar,
		ROOT::Fit::ParameterSettings &	varObj
	)		const

virtual

get variable settings in a variable object (like ROOT::Fit::ParamsSettings)

Reimplemented from ROOT::Math::Minimizer.

Definition at line 211 of file BasicMinimizer.cxx.

◆ GradObjFunction()

const ROOT::Math::IMultiGradFunction * ROOT::Math::BasicMinimizer::GradObjFunction ( ) const

return pointer to used gradient object function (NULL if gradient is not supported)

Definition at line 348 of file BasicMinimizer.cxx.

◆ IsFixedVariable()

bool ROOT::Math::BasicMinimizer::IsFixedVariable ( unsigned int ivar ) const

virtual

query if an existing variable is fixed (i.e.

considered constant in the minimization) note that by default all variables are not fixed

Reimplemented from ROOT::Math::Minimizer.

Definition at line 206 of file BasicMinimizer.cxx.

◆ Minimize()

bool ROOT::Math::BasicMinimizer::Minimize ( )

virtual

method to perform the minimization

Implements ROOT::Math::Minimizer.

Reimplemented in ROOT::Math::GSLMinimizer, ROOT::Math::GSLNLSMinimizer, ROOT::Math::GSLSimAnMinimizer, and ROOT::Math::RMinimizer.

Definition at line 316 of file BasicMinimizer.cxx.

◆ MinValue()

virtual double ROOT::Math::BasicMinimizer::MinValue ( ) const

inlinevirtual

return minimum function value

Implements ROOT::Math::Minimizer.

Definition at line 136 of file BasicMinimizer.h.

◆ NDim()

virtual unsigned int ROOT::Math::BasicMinimizer::NDim ( ) const

inlinevirtual

number of dimensions

Implements ROOT::Math::Minimizer.

Definition at line 142 of file BasicMinimizer.h.

◆ NFree()

unsigned int ROOT::Math::BasicMinimizer::NFree ( ) const

virtual

number of free variables (real dimension of the problem)

Reimplemented from ROOT::Math::Minimizer.

Definition at line 356 of file BasicMinimizer.cxx.

◆ NPar()

virtual unsigned int ROOT::Math::BasicMinimizer::NPar ( ) const

inlinevirtual

total number of parameter defined

Definition at line 148 of file BasicMinimizer.h.

◆ ObjFunction()

const ROOT::Math::IMultiGenFunction * ROOT::Math::BasicMinimizer::ObjFunction ( ) const

inline

return pointer to used objective function

Definition at line 151 of file BasicMinimizer.h.

◆ operator=()

BasicMinimizer & ROOT::Math::BasicMinimizer::operator= ( const BasicMinimizer & rhs )

inlineprivate

Assignment operator.

Definition at line 80 of file BasicMinimizer.h.

◆ PrintResult()

void ROOT::Math::BasicMinimizer::PrintResult ( ) const

print result of minimization

Definition at line 336 of file BasicMinimizer.cxx.

◆ ReleaseVariable()

bool ROOT::Math::BasicMinimizer::ReleaseVariable ( unsigned int ivar )

virtual

release an existing variable

Reimplemented from ROOT::Math::Minimizer.

Definition at line 189 of file BasicMinimizer.cxx.

◆ SetFinalValues()

void ROOT::Math::BasicMinimizer::SetFinalValues ( const double * x )

protected

Definition at line 322 of file BasicMinimizer.cxx.

◆ SetFixedVariable()

bool ROOT::Math::BasicMinimizer::SetFixedVariable	(	unsigned int	ivar,
		const std::string &	name,
		double	val
	)

virtual

set fixed variable (override if minimizer supports them )

Reimplemented from ROOT::Math::Minimizer.

Definition at line 116 of file BasicMinimizer.cxx.

◆ SetFunction() [1/2]

void ROOT::Math::BasicMinimizer::SetFunction ( const ROOT::Math::IMultiGenFunction & func )

virtual

set the function to minimize

Implements ROOT::Math::Minimizer.

Reimplemented in ROOT::Math::GSLMinimizer, and ROOT::Math::GSLNLSMinimizer.

Definition at line 240 of file BasicMinimizer.cxx.

◆ SetFunction() [2/2]

void ROOT::Math::BasicMinimizer::SetFunction ( const ROOT::Math::IMultiGradFunction & func )

virtual

set gradient the function to minimize

Reimplemented from ROOT::Math::Minimizer.

Reimplemented in ROOT::Math::GSLMinimizer, and ROOT::Math::GSLNLSMinimizer.

Definition at line 246 of file BasicMinimizer.cxx.

◆ SetLimitedVariable()

bool ROOT::Math::BasicMinimizer::SetLimitedVariable	(	unsigned int	ivar,
		const std::string &	name,
		double	val,
		double	step,
		double	lower,
		double	upper
	)

virtual

set upper/lower limited variable (override if minimizer supports them )

Reimplemented from ROOT::Math::Minimizer.

Definition at line 107 of file BasicMinimizer.cxx.

◆ SetLowerLimitedVariable()

bool ROOT::Math::BasicMinimizer::SetLowerLimitedVariable	(	unsigned int	ivar,
		const std::string &	name,
		double	val,
		double	step,
		double	lower
	)

virtual

set lower limit variable (override if minimizer supports them )

Reimplemented from ROOT::Math::Minimizer.

Definition at line 88 of file BasicMinimizer.cxx.

◆ SetMinValue()

void ROOT::Math::BasicMinimizer::SetMinValue ( double val )

inlineprotected

Definition at line 175 of file BasicMinimizer.h.

◆ SetUpperLimitedVariable()

bool ROOT::Math::BasicMinimizer::SetUpperLimitedVariable	(	unsigned int	ivar,
		const std::string &	name,
		double	val,
		double	step,
		double	upper
	)

virtual

set upper limit variable (override if minimizer supports them )

Reimplemented from ROOT::Math::Minimizer.

Definition at line 97 of file BasicMinimizer.cxx.

◆ SetVariable()

bool ROOT::Math::BasicMinimizer::SetVariable	(	unsigned int	ivar,
		const std::string &	name,
		double	val,
		double	step
	)

virtual

set free variable

Implements ROOT::Math::Minimizer.

Definition at line 63 of file BasicMinimizer.cxx.

◆ SetVariableLimits()

bool ROOT::Math::BasicMinimizer::SetVariableLimits	(	unsigned int	ivar,
		double	lower,
		double	upper
	)

virtual

set the limits of an already existing variable

Reimplemented from ROOT::Math::Minimizer.

Definition at line 159 of file BasicMinimizer.cxx.

◆ SetVariableLowerLimit()

bool ROOT::Math::BasicMinimizer::SetVariableLowerLimit	(	unsigned int	ivar,
		double	lower
	)

virtual

set the lower-limit of an already existing variable

Reimplemented from ROOT::Math::Minimizer.

Definition at line 147 of file BasicMinimizer.cxx.

◆ SetVariableStepSize()

bool ROOT::Math::BasicMinimizer::SetVariableStepSize	(	unsigned int	ivar,
		double	step
	)

virtual

set the step size of an already existing variable

Reimplemented from ROOT::Math::Minimizer.

Definition at line 140 of file BasicMinimizer.cxx.

◆ SetVariableUpperLimit()

bool ROOT::Math::BasicMinimizer::SetVariableUpperLimit	(	unsigned int	ivar,
		double	upper
	)

virtual

set the upper-limit of an already existing variable

Reimplemented from ROOT::Math::Minimizer.

Definition at line 153 of file BasicMinimizer.cxx.

◆ SetVariableValue()

bool ROOT::Math::BasicMinimizer::SetVariableValue	(	unsigned int	ivar,
		double	val
	)

virtual

set the value of an existing variable

Reimplemented from ROOT::Math::Minimizer.

Definition at line 125 of file BasicMinimizer.cxx.

◆ SetVariableValues()

bool ROOT::Math::BasicMinimizer::SetVariableValues ( const double * x )

virtual

set the values of all existing variables (array must be dimensioned to the size of existing parameters)

Reimplemented from ROOT::Math::Minimizer.

Definition at line 133 of file BasicMinimizer.cxx.

◆ StepSizes()

virtual const double * ROOT::Math::BasicMinimizer::StepSizes ( ) const

inlinevirtual

accessor methods

Definition at line 163 of file BasicMinimizer.h.

◆ TransformFunction()

const MinimTransformFunction * ROOT::Math::BasicMinimizer::TransformFunction ( ) const

return transformation function (NULL if not having a transformation)

Definition at line 352 of file BasicMinimizer.cxx.

◆ VariableIndex()

int ROOT::Math::BasicMinimizer::VariableIndex ( const std::string & name ) const

virtual

get index of variable given a variable given a name return -1 if variable is not found

Reimplemented from ROOT::Math::Minimizer.

Definition at line 232 of file BasicMinimizer.cxx.

◆ VariableName()

std::string ROOT::Math::BasicMinimizer::VariableName ( unsigned int ivar ) const

virtual

get name of variables (override if minimizer support storing of variable names)

Reimplemented from ROOT::Math::Minimizer.

Definition at line 227 of file BasicMinimizer.cxx.

◆ X()

virtual const double * ROOT::Math::BasicMinimizer::X ( ) const

inlinevirtual

return pointer to X values at the minimum

Implements ROOT::Math::Minimizer.

Definition at line 139 of file BasicMinimizer.h.

Member Data Documentation

◆ fBounds

std::map< unsigned int, std::pair<double, double> > ROOT::Math::BasicMinimizer::fBounds

private

Definition at line 189 of file BasicMinimizer.h.

◆ fDim

unsigned int ROOT::Math::BasicMinimizer::fDim

private

Definition at line 180 of file BasicMinimizer.h.

◆ fMinVal

double ROOT::Math::BasicMinimizer::fMinVal

private

Definition at line 184 of file BasicMinimizer.h.

◆ fNames

std::vector<std::string> ROOT::Math::BasicMinimizer::fNames

private

Definition at line 187 of file BasicMinimizer.h.

◆ fObjFunc

const ROOT::Math::IMultiGenFunction* ROOT::Math::BasicMinimizer::fObjFunc

private

Definition at line 182 of file BasicMinimizer.h.

◆ fSteps

std::vector<double> ROOT::Math::BasicMinimizer::fSteps

private

Definition at line 186 of file BasicMinimizer.h.

◆ fValues

std::vector<double> ROOT::Math::BasicMinimizer::fValues

private

Definition at line 185 of file BasicMinimizer.h.

◆ fVarTypes

std::vector<ROOT::Math::EMinimVariableType> ROOT::Math::BasicMinimizer::fVarTypes

private

Definition at line 188 of file BasicMinimizer.h.

Libraries for ROOT::Math::BasicMinimizer:

[legend]

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

math/mathcore/inc/Math/BasicMinimizer.h
math/mathcore/src/BasicMinimizer.cxx

Public Member Functions

Protected Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ BasicMinimizer() [1/2]

◆ ~BasicMinimizer()

◆ BasicMinimizer() [2/2]

Member Function Documentation

◆ CheckDimension()

◆ CheckObjFunction()

◆ CreateTransformation()

◆ FixVariable()

◆ GetVariableSettings()

◆ GradObjFunction()

◆ IsFixedVariable()

◆ Minimize()

◆ MinValue()

◆ NDim()

◆ NFree()

◆ NPar()

◆ ObjFunction()

◆ operator=()

◆ PrintResult()

◆ ReleaseVariable()

◆ SetFinalValues()

◆ SetFixedVariable()

◆ SetFunction() [1/2]

◆ SetFunction() [2/2]

◆ SetLimitedVariable()

◆ SetLowerLimitedVariable()

◆ SetMinValue()

◆ SetUpperLimitedVariable()

◆ SetVariable()

◆ SetVariableLimits()

◆ SetVariableLowerLimit()

◆ SetVariableStepSize()

◆ SetVariableUpperLimit()

◆ SetVariableValue()

◆ SetVariableValues()

◆ StepSizes()

◆ TransformFunction()

◆ VariableIndex()

◆ VariableName()

◆ X()

Member Data Documentation

◆ fBounds

◆ fDim

◆ fMinVal

◆ fNames

◆ fObjFunc

◆ fSteps

◆ fValues

◆ fVarTypes