Class to Wrap a ROOT Function class (like TF1) in a IParamMultiFunction interface of multi-dimensions to be used in the ROOT::Math numerical algorithm This wrapper class does not own the TF1 pointer, so it assumes it exists during the wrapper lifetime.

The class copy the TF1 pointer only when it owns it

The class from ROOT version 6.03 does not contain anymore a copy of the parameters. The parameters are stored in the TF1 class.

Definition at line 44 of file WrappedMultiTF1.h.

Public Types
typedef ROOT::Math::IParamMultiGradFunction	BaseParamFunc

typedef ROOT::Math::IParamMultiFunction::BaseFunc	BaseFunc

Public Types inherited from ROOT::Math::IParametricGradFunctionMultiDim
typedef IParametricFunctionMultiDim	BaseParamFunc

typedef IGradientFunctionMultiDim	BaseGradFunc

typedef IParametricFunctionMultiDim::BaseFunc	BaseFunc

Public Types inherited from ROOT::Math::IParametricFunctionMultiDim
typedef IBaseFunctionMultiDim	BaseFunc

Public Types inherited from ROOT::Math::IBaseFunctionMultiDim
typedef IBaseFunctionMultiDim	BaseFunc

Public Member Functions
	WrappedMultiTF1 (TF1 &f, unsigned int dim=0)
	constructor from a function pointer to a TF1 If dim = 0 dimension is taken from TF1::GetNdim(). More...

virtual	~WrappedMultiTF1 ()
	Destructor (no operations). More...

	WrappedMultiTF1 (const WrappedMultiTF1 &rhs)
	Copy constructor. More...

WrappedMultiTF1 &	operator= (const WrappedMultiTF1 &rhs)
	Assignment operator. More...

interface inherited from IFunction
IMultiGenFunction *	Clone () const
	Clone the wrapper but not the original function. More...

unsigned int	NDim () const
	function dimension More...

Public Member Functions inherited from ROOT::Math::IParametricGradFunctionMultiDim
virtual	~IParametricGradFunctionMultiDim ()
	Virtual Destructor (no operations) More...

double	ParameterDerivative (const double x, const double p, unsigned int ipar=0) const
	Evaluate the partial derivative w.r.t a parameter ipar from values and parameters. More...

void	ParameterGradient (const double x, double grad) const
	Evaluate all derivatives using cached parameter values. More...

double	ParameterDerivative (const double *x, unsigned int ipar=0) const
	Evaluate partial derivative using cached parameter values. More...

Public Member Functions inherited from ROOT::Math::IParametricFunctionMultiDim
double	operator() (const double x, const double p) const
	Evaluate function at a point x and for given parameters p. More...

Public Member Functions inherited from ROOT::Math::IBaseFunctionMultiDim
	IBaseFunctionMultiDim ()

virtual	~IBaseFunctionMultiDim ()
	virtual destructor More...

double	operator() (const double *x) const
	Evaluate the function at a point x[]. More...

Public Member Functions inherited from ROOT::Math::IBaseParam
virtual	~IBaseParam ()
	Virtual Destructor (no operations) More...

interface inherited from IParamFunction
bool	fLinear

bool	fPolynomial

bool	fOwnFunc

TF1 *	fFunc

unsigned int	fDim

static double	fgEps = 0.001

const double *	Parameters () const
	get the parameter values (return values from TF1) More...

void	SetParameters (const double *p)
	set parameter values (only the cached one in this class,leave unchanges those of TF1) More...

unsigned int	NPar () const
	return number of parameters More...

std::string	ParameterName (unsigned int i) const
	return parameter name (from TF1) More...

void	ParameterGradient (const double x, const double par, double *grad) const
	evaluate the derivative of the function with respect to the parameters More...

const TF1 *	GetFunction () const
	method to retrieve the internal function pointer More...

void	SetAndCopyFunction (const TF1 *f=0)
	method to set a new function pointer and copy it inside. More...

static void	SetDerivPrecision (double eps)
	precision value used for calculating the derivative step-size h = eps * \|x\|. More...

static double	GetDerivPrecision ()
	get precision value used for calculating the derivative step-size More...

double	DoEvalPar (const double x, const double p) const
	evaluate function passing coordinates x and vector of parameters More...

double	DoEval (const double *x) const
	evaluate function using the cached parameter values (of TF1) re-implement for better efficiency More...

double	DoParameterDerivative (const double x, const double p, unsigned int ipar) const
	evaluate the partial derivative with respect to the parameter More...

#include <Math/WrappedMultiTF1.h>

Inheritance diagram for ROOT::Math::WrappedMultiTF1:

Collaboration diagram for ROOT::Math::WrappedMultiTF1:

Member Typedef Documentation

typedef ROOT::Math::IParamMultiFunction::BaseFunc ROOT::Math::WrappedMultiTF1::BaseFunc

Definition at line 49 of file WrappedMultiTF1.h.

typedef ROOT::Math::IParamMultiGradFunction ROOT::Math::WrappedMultiTF1::BaseParamFunc

Definition at line 48 of file WrappedMultiTF1.h.

Constructor & Destructor Documentation

ROOT::Math::WrappedMultiTF1::WrappedMultiTF1	(	TF1 &	f,
		unsigned int	dim = `0`
	)

constructor from a function pointer to a TF1 If dim = 0 dimension is taken from TF1::GetNdim().

IN case of multi-dimensional function created using directly TF1 object the dimension returned by TF1::GetNdim is always 1. The user must then pass the correct value of dim

Definition at line 138 of file WrappedTF1.cxx.

Referenced by Clone().

virtual ROOT::Math::WrappedMultiTF1::~WrappedMultiTF1 ( )

inlinevirtual

Destructor (no operations).

Function pointer is not owned

Definition at line 63 of file WrappedMultiTF1.h.

ROOT::Math::WrappedMultiTF1::WrappedMultiTF1 ( const WrappedMultiTF1 & rhs )

Copy constructor.

Definition at line 170 of file WrappedTF1.cxx.

Member Function Documentation

IMultiGenFunction* ROOT::Math::WrappedMultiTF1::Clone ( ) const

inlinevirtual

Clone the wrapper but not the original function.

Implements ROOT::Math::IBaseFunctionMultiDim.

Definition at line 81 of file WrappedMultiTF1.h.

double ROOT::Math::WrappedMultiTF1::DoEval ( const double * x ) const

inlineprivatevirtual

evaluate function using the cached parameter values (of TF1) re-implement for better efficiency

Reimplemented from ROOT::Math::IParametricFunctionMultiDim.

Definition at line 146 of file WrappedMultiTF1.h.

double ROOT::Math::WrappedMultiTF1::DoEvalPar	(	const double *	x,
		const double *	p
	)		const

inlineprivatevirtual

evaluate function passing coordinates x and vector of parameters

Implements ROOT::Math::IParametricFunctionMultiDim.

Definition at line 139 of file WrappedMultiTF1.h.

double ROOT::Math::WrappedMultiTF1::DoParameterDerivative	(	const double *	x,
		const double *	p,
		unsigned int	ipar
	)		const

privatevirtual

evaluate the partial derivative with respect to the parameter

Implements ROOT::Math::IParametricGradFunctionMultiDim.

Definition at line 216 of file WrappedTF1.cxx.

Referenced by ParameterGradient().

double ROOT::Math::WrappedMultiTF1::GetDerivPrecision ( )

static

get precision value used for calculating the derivative step-size

Definition at line 240 of file WrappedTF1.cxx.

const TF1* ROOT::Math::WrappedMultiTF1::GetFunction ( ) const

inline

method to retrieve the internal function pointer

Definition at line 128 of file WrappedMultiTF1.h.

unsigned int ROOT::Math::WrappedMultiTF1::NDim ( ) const

inlinevirtual

function dimension

Implements ROOT::Math::IBaseFunctionMultiDim.

Definition at line 86 of file WrappedMultiTF1.h.

Referenced by testMore().

unsigned int ROOT::Math::WrappedMultiTF1::NPar ( ) const

inlinevirtual

return number of parameters

Implements ROOT::Math::IBaseParam.

Definition at line 106 of file WrappedMultiTF1.h.

Referenced by ParameterGradient().

WrappedMultiTF1 & ROOT::Math::WrappedMultiTF1::operator= ( const WrappedMultiTF1 & rhs )

Assignment operator.

Definition at line 185 of file WrappedTF1.cxx.

void ROOT::Math::WrappedMultiTF1::ParameterGradient	(	const double *	x,
		const double *	par,
		double *	grad
	)		const

virtual

evaluate the derivative of the function with respect to the parameters

Reimplemented from ROOT::Math::IParametricGradFunctionMultiDim.

Definition at line 197 of file WrappedTF1.cxx.

std::string ROOT::Math::WrappedMultiTF1::ParameterName ( unsigned int i ) const

inlinevirtual

return parameter name (from TF1)

Reimplemented from ROOT::Math::IBaseParam.

Definition at line 112 of file WrappedMultiTF1.h.

const double* ROOT::Math::WrappedMultiTF1::Parameters ( ) const

inlinevirtual

get the parameter values (return values from TF1)

Implements ROOT::Math::IBaseParam.

Definition at line 94 of file WrappedMultiTF1.h.

void ROOT::Math::WrappedMultiTF1::SetAndCopyFunction ( const TF1 * f = 0 )

method to set a new function pointer and copy it inside.

By calling this method the class manages now the passed TF1 pointer

Definition at line 242 of file WrappedTF1.cxx.

Referenced by TFitResult::TFitResult(), and WrappedMultiTF1().

void ROOT::Math::WrappedMultiTF1::SetDerivPrecision ( double eps )

static

precision value used for calculating the derivative step-size h = eps * |x|.

The default is 0.001, give a smaller in case function changes rapidly

Definition at line 238 of file WrappedTF1.cxx.

void ROOT::Math::WrappedMultiTF1::SetParameters ( const double * p )

inlinevirtual

set parameter values (only the cached one in this class,leave unchanges those of TF1)

Implements ROOT::Math::IBaseParam.

Definition at line 100 of file WrappedMultiTF1.h.

Member Data Documentation

unsigned int ROOT::Math::WrappedMultiTF1::fDim

private

Definition at line 162 of file WrappedMultiTF1.h.

Referenced by DoParameterDerivative(), NDim(), operator=(), and WrappedMultiTF1().

TF1* ROOT::Math::WrappedMultiTF1::fFunc

private

Definition at line 161 of file WrappedMultiTF1.h.

Referenced by DoEval(), DoEvalPar(), DoParameterDerivative(), GetFunction(), NPar(), ParameterGradient(), ParameterName(), Parameters(), SetAndCopyFunction(), SetParameters(), WrappedMultiTF1(), and ~WrappedMultiTF1().

double ROOT::Math::WrappedMultiTF1::fgEps = 0.001

staticprivate

Definition at line 165 of file WrappedMultiTF1.h.

Referenced by DoParameterDerivative(), GetDerivPrecision(), ParameterGradient(), and SetDerivPrecision().

bool ROOT::Math::WrappedMultiTF1::fLinear

private

Definition at line 158 of file WrappedMultiTF1.h.

Referenced by DoParameterDerivative(), operator=(), ParameterGradient(), and WrappedMultiTF1().

bool ROOT::Math::WrappedMultiTF1::fOwnFunc

private

Definition at line 160 of file WrappedMultiTF1.h.

Referenced by operator=(), SetAndCopyFunction(), WrappedMultiTF1(), and ~WrappedMultiTF1().

bool ROOT::Math::WrappedMultiTF1::fPolynomial

private

Definition at line 159 of file WrappedMultiTF1.h.

Referenced by DoParameterDerivative(), operator=(), and WrappedMultiTF1().

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

hist/hist/inc/Math/WrappedMultiTF1.h
hist/hist/src/WrappedTF1.cxx

Public Types

Public Member Functions

interface inherited from IParamFunction

Member Typedef Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation