Class to Wrap a ROOT Function class (like TF1) in a IParamFunction interface of one dimensions to be used in the ROOT::Math numerical algorithms The wrapper does not own bby default the TF1 pointer, so it assumes it exists during the wrapper lifetime.

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 41 of file WrappedTF1.h.

Public Types
typedef ROOT::Math::IParamGradFunction::BaseFunc	BaseFunc

typedef ROOT::Math::IParamGradFunction	BaseGradFunc

typedef ROOT::Math::IGradientOneDim	IGrad

Public Types inherited from ROOT::Math::IParametricGradFunctionOneDim
typedef IParametricFunctionOneDim::BaseFunc	BaseFunc

typedef IGradientFunctionOneDim	BaseGradFunc

typedef IParametricFunctionOneDim	BaseParamFunc

Public Types inherited from ROOT::Math::IParametricFunctionOneDim
typedef IBaseFunctionOneDim	BaseFunc

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

Public Member Functions
	WrappedTF1 (TF1 &f)
	constructor from a TF1 function pointer. More...

	WrappedTF1 (const WrappedTF1 &rhs)
	Copy constructor. More...

virtual	~WrappedTF1 ()
	Destructor (no operations). More...

WrappedTF1 &	operator= (const WrappedTF1 &rhs)
	Assignment operator. More...

interface inherited from IFunction
ROOT::Math::IGenFunction *	Clone () const
	Clone the wrapper but not the original function. More...

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

double	ParameterDerivative (double x, const double *p, unsigned int ipar=0) const
	Partial derivative with respect a parameter. More...

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

double	ParameterDerivative (const double x, const double p, unsigned int ipar=0) const
	Partial derivative with respect a parameter Compatibility interface with multi-dimensional functions. More...

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

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

void	ParameterGradient (const double x, const double p, double *grad) const
	Compatibility interface with multi-dimensional functions. More...

void	ParameterGradient (const double x, double grad) const
	Evaluate all derivatives using cached parameter values (multi-dim like interface) More...

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

double	operator() (const double x, const double p) const
	multidim-like interface More...

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

virtual	~IBaseFunctionOneDim ()
	virtual destructor More...

double	operator() (double x) const
	Evaluate the function at a point x Use the a pure virtual private method DoEval which must be implemented by sub-classes. 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...

Public Member Functions inherited from ROOT::Math::IGradientOneDim
virtual	~IGradientOneDim ()
	virtual destructor More...

double	Derivative (double x) const
	Return the derivative of the function at a point x Use the private method DoDerivative. More...

double	Derivative (const double *x) const
	Compatibility method with multi-dimensional interface for partial derivative. More...

void	FdF (const double x, double &f, double df) const
	Compatibility method with multi-dimensional interface for Gradient and function evaluation. More...

void	Gradient (const double x, double g) const
	Compatibility method with multi-dimensional interface for Gradient. More...

interface inherited from IParamFunction
bool	fLinear

bool	fPolynomial

TF1 *	fFunc

double	fX [1]

static double	fgEps = 0.001
	cached vector for x value (needed for TF1::EvalPar signature) More...

const double *	Parameters () const
	get the parameter values (return values cachen inside, those inside TF1 might be different) More...

void	SetParameters (const double *p)
	set parameter values More...

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

std::string	ParameterName (unsigned int i) const
	return parameter name (this is stored in TF1) More...

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

void	FdF (double x, double &f, double &deriv) const
	calculate function and derivative at same time (required by IGradient interface) 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 (double x, const double *p) const
	evaluate function passing coordinates x and vector of parameters More...

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

double	DoDerivative (double x) const
	return the function derivatives w.r.t. x More...

double	DoParameterDerivative (double x, const double *p, unsigned int ipar) const
	evaluate the derivative of the function with respect to the parameters More...

#include <Math/WrappedTF1.h>

Inheritance diagram for ROOT::Math::WrappedTF1:

[legend]

Member Typedef Documentation

◆ BaseFunc

typedef ROOT::Math::IParamGradFunction::BaseFunc ROOT::Math::WrappedTF1::BaseFunc

Definition at line 47 of file WrappedTF1.h.

◆ BaseGradFunc

typedef ROOT::Math::IParamGradFunction ROOT::Math::WrappedTF1::BaseGradFunc

Definition at line 46 of file WrappedTF1.h.

◆ IGrad

typedef ROOT::Math::IGradientOneDim ROOT::Math::WrappedTF1::IGrad

Definition at line 45 of file WrappedTF1.h.

Constructor & Destructor Documentation

◆ WrappedTF1() [1/2]

ROOT::Math::WrappedTF1::WrappedTF1 ( TF1 & f )

constructor from a TF1 function pointer.

Definition at line 29 of file WrappedTF1.cxx.

◆ ~WrappedTF1()

virtual ROOT::Math::WrappedTF1::~WrappedTF1 ( )

inlinevirtual

Destructor (no operations).

TF1 Function pointer is not owned

Definition at line 58 of file WrappedTF1.h.

◆ WrappedTF1() [2/2]

ROOT::Math::WrappedTF1::WrappedTF1 ( const WrappedTF1 & rhs )

Copy constructor.

Definition at line 57 of file WrappedTF1.cxx.

Member Function Documentation

◆ Clone()

ROOT::Math::IGenFunction* ROOT::Math::WrappedTF1::Clone ( ) const

inlinevirtual

Clone the wrapper but not the original function.

Implements ROOT::Math::IBaseFunctionOneDim.

Definition at line 75 of file WrappedTF1.h.

◆ DoDerivative()

double ROOT::Math::WrappedTF1::DoDerivative ( double x ) const

privatevirtual

return the function derivatives w.r.t. x

Implements ROOT::Math::IGradientOneDim.

Definition at line 97 of file WrappedTF1.cxx.

◆ DoEval()

double ROOT::Math::WrappedTF1::DoEval ( double x ) const

inlineprivatevirtual

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

Reimplemented from ROOT::Math::IParametricFunctionOneDim.

Definition at line 137 of file WrappedTF1.h.

◆ DoEvalPar()

double ROOT::Math::WrappedTF1::DoEvalPar	(	double	x,
		const double *	p
	)		const

inlineprivatevirtual

evaluate function passing coordinates x and vector of parameters

Implements ROOT::Math::IParametricFunctionOneDim.

Definition at line 129 of file WrappedTF1.h.

◆ DoParameterDerivative()

double ROOT::Math::WrappedTF1::DoParameterDerivative	(	double	x,
		const double *	p,
		unsigned int	ipar
	)		const

privatevirtual

evaluate the derivative of the function with respect to the parameters

Implements ROOT::Math::IParametricGradFunctionOneDim.

Definition at line 105 of file WrappedTF1.cxx.

◆ FdF()

void ROOT::Math::WrappedTF1::FdF	(	double	x,
		double &	f,
		double &	deriv
	)		const

inlinevirtual

calculate function and derivative at same time (required by IGradient interface)

Implements ROOT::Math::IGradientOneDim.

Definition at line 113 of file WrappedTF1.h.

◆ GetDerivPrecision()

double ROOT::Math::WrappedTF1::GetDerivPrecision ( )

static

get precision value used for calculating the derivative step-size

Definition at line 131 of file WrappedTF1.cxx.

◆ NPar()

unsigned int ROOT::Math::WrappedTF1::NPar ( ) const

inlinevirtual

return number of parameters

Implements ROOT::Math::IBaseParam.

Definition at line 96 of file WrappedTF1.h.

◆ operator=()

WrappedTF1 & ROOT::Math::WrappedTF1::operator= ( const WrappedTF1 & rhs )

Assignment operator.

Definition at line 71 of file WrappedTF1.cxx.

◆ ParameterGradient()

void ROOT::Math::WrappedTF1::ParameterGradient	(	double	x,
		const double *	par,
		double *	grad
	)		const

virtual

evaluate the derivative of the function with respect to the parameters

Reimplemented from ROOT::Math::IParametricGradFunctionOneDim.

Definition at line 82 of file WrappedTF1.cxx.

◆ ParameterName()

std::string ROOT::Math::WrappedTF1::ParameterName ( unsigned int i ) const

inlinevirtual

return parameter name (this is stored in TF1)

Reimplemented from ROOT::Math::IBaseParam.

Definition at line 102 of file WrappedTF1.h.

◆ Parameters()

const double* ROOT::Math::WrappedTF1::Parameters ( ) const

inlinevirtual

get the parameter values (return values cachen inside, those inside TF1 might be different)

Implements ROOT::Math::IBaseParam.

Definition at line 83 of file WrappedTF1.h.

◆ SetDerivPrecision()

void ROOT::Math::WrappedTF1::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 129 of file WrappedTF1.cxx.

◆ SetParameters()

void ROOT::Math::WrappedTF1::SetParameters ( const double * p )

inlinevirtual

set parameter values

need to call also SetParameters in TF1 in ace some other operations (re-normalizations) are needed

Implements ROOT::Math::IBaseParam.

Definition at line 90 of file WrappedTF1.h.

Member Data Documentation

◆ fFunc

TF1* ROOT::Math::WrappedTF1::fFunc

private

Definition at line 153 of file WrappedTF1.h.

◆ fgEps

double ROOT::Math::WrappedTF1::fgEps = 0.001

staticprivate

cached vector for x value (needed for TF1::EvalPar signature)

Definition at line 157 of file WrappedTF1.h.

◆ fLinear

bool ROOT::Math::WrappedTF1::fLinear

private

Definition at line 151 of file WrappedTF1.h.

◆ fPolynomial

bool ROOT::Math::WrappedTF1::fPolynomial

private

Definition at line 152 of file WrappedTF1.h.

◆ fX

double ROOT::Math::WrappedTF1::fX[1]

mutableprivate

Definition at line 154 of file WrappedTF1.h.

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

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

Public Types

Public Member Functions

interface inherited from IParamFunction

Member Typedef Documentation

◆ BaseFunc

◆ BaseGradFunc

◆ IGrad

Constructor & Destructor Documentation

◆ WrappedTF1() [1/2]

◆ ~WrappedTF1()

◆ WrappedTF1() [2/2]

Member Function Documentation

◆ Clone()

◆ DoDerivative()

◆ DoEval()

◆ DoEvalPar()

◆ DoParameterDerivative()

◆ FdF()

◆ GetDerivPrecision()

◆ NPar()

◆ operator=()

◆ ParameterGradient()

◆ ParameterName()

◆ Parameters()

◆ SetDerivPrecision()

◆ SetParameters()

Member Data Documentation

◆ fFunc

◆ fgEps

◆ fLinear

◆ fPolynomial

◆ fX