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ROOT::Math::WrappedTF1 Class Reference

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 39 of file WrappedTF1.h.

Public Types

typedef ROOT::Math::IParamGradFunction::BaseFunc BaseFunc
 
typedef ROOT::Math::IParamGradFunction BaseGradFunc
 
typedef ROOT::Math::IGradientFunctionOneDim 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 Types inherited from ROOT::Math::IGradientFunctionOneDim
typedef IBaseFunctionOneDim BaseFunc
 
typedef IGradientFunctionOneDim BaseGrad
 

Public Member Functions

 WrappedTF1 (const WrappedTF1 &rhs)
 Copy constructor.
 
 WrappedTF1 (TF1 &f)
 constructor from a TF1 function pointer.
 
 ~WrappedTF1 () override
 Destructor (no operations).
 
WrappedTF1operator= (const WrappedTF1 &rhs)
 Assignment operator.
 
interface inherited from IFunction
ROOT::Math::IGenFunctionClone () const override
 Clone the wrapper but not the original function.
 
- Public Member Functions inherited from ROOT::Math::IParametricGradFunctionOneDim
 ~IParametricGradFunctionOneDim () override
 Virtual Destructor (no operations)
 
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.
 
double ParameterDerivative (const double *x, unsigned int ipar=0) const
 Evaluate partial derivative using cached parameter values (multi-dim like interface)
 
double ParameterDerivative (double x, const double *p, unsigned int ipar=0) const
 Partial derivative with respect a parameter.
 
double ParameterDerivative (double x, unsigned int ipar=0) const
 Evaluate partial derivative using cached parameter values.
 
void ParameterGradient (const double *x, const double *p, double *grad) const
 Compatibility interface with multi-dimensional functions.
 
void ParameterGradient (const double *x, double *grad) const
 Evaluate all derivatives using cached parameter values (multi-dim like interface)
 
void ParameterGradient (double x, double *grad) const
 Evaluate all derivatives using cached parameter values.
 
- Public Member Functions inherited from ROOT::Math::IParametricFunctionOneDim
double operator() (const double *x, const double *p) const
 multidim-like interface
 
double operator() (double x, const double *p) const
 Evaluate function at a point x and for given parameters p.
 
- Public Member Functions inherited from ROOT::Math::IBaseFunctionOneDim
virtual ~IBaseFunctionOneDim ()=default
 
double operator() (const double *x) const
 Evaluate the function at a point x[].
 
double operator() (double x) const
 Evaluate the function at a point x.
 
- Public Member Functions inherited from ROOT::Math::IBaseParam
virtual ~IBaseParam ()
 Virtual Destructor (no operations)
 
- Public Member Functions inherited from ROOT::Math::IGradientFunctionOneDim
double Derivative (const double *x) const
 Compatibility method with multi-dimensional interface for partial derivative.
 
double Derivative (double x) const
 Return the derivative of the function at a point x Use the private method DoDerivative.
 
void FdF (const double *x, double &f, double *df) const
 Compatibility method with multi-dimensional interface for Gradient and function evaluation.
 
void Gradient (const double *x, double *g) const
 Compatibility method with multi-dimensional interface for Gradient.
 
bool HasGradient () const override
 

interface inherited from IParamFunction

bool fLinear
 
bool fPolynomial
 
TF1fFunc
 
double fX [1]
 
const doubleParameters () const override
 get the parameter values (return values cachen inside, those inside TF1 might be different)
 
void SetParameters (const double *p) override
 set parameter values need to call also SetParameters in TF1 in ace some other operations (re-normalizations) are needed
 
unsigned int NPar () const override
 return number of parameters
 
std::string ParameterName (unsigned int i) const override
 return parameter name (this is stored in TF1)
 
void ParameterGradient (double x, const double *par, double *grad) const override
 evaluate the derivative of the function with respect to the parameters
 
void FdF (double x, double &f, double &deriv) const override
 calculate function and derivative at same time (required by IGradient interface)
 
static void SetDerivPrecision (double eps)
 precision value used for calculating the derivative step-size h = eps * |x|.
 
static double GetDerivPrecision ()
 get precision value used for calculating the derivative step-size
 
double DoEvalPar (double x, const double *p) const override
 evaluate function passing coordinates x and vector of parameters
 
double DoEval (double x) const override
 evaluate function using the cached parameter values (of TF1) re-implement for better efficiency
 
double DoDerivative (double x) const override
 return the function derivatives w.r.t. x
 
double DoParameterDerivative (double x, const double *p, unsigned int ipar) const override
 evaluate the derivative of the function with respect to the parameters
 

#include <Math/WrappedTF1.h>

Inheritance diagram for ROOT::Math::WrappedTF1:
[legend]

Member Typedef Documentation

◆ BaseFunc

◆ BaseGradFunc

◆ IGrad

Constructor & Destructor Documentation

◆ WrappedTF1() [1/2]

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

constructor from a TF1 function pointer.

Definition at line 41 of file WrappedTF1.cxx.

◆ ~WrappedTF1()

ROOT::Math::WrappedTF1::~WrappedTF1 ( )
inlineoverride

Destructor (no operations).

TF1 Function pointer is not owned

Definition at line 56 of file WrappedTF1.h.

◆ WrappedTF1() [2/2]

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

Copy constructor.

Definition at line 69 of file WrappedTF1.cxx.

Member Function Documentation

◆ Clone()

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

Clone the wrapper but not the original function.

Implements ROOT::Math::IBaseFunctionOneDim.

Definition at line 73 of file WrappedTF1.h.

◆ DoDerivative()

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

return the function derivatives w.r.t. x

Implements ROOT::Math::IGradientFunctionOneDim.

Definition at line 110 of file WrappedTF1.cxx.

◆ DoEval()

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

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

Reimplemented from ROOT::Math::IParametricFunctionOneDim.

Definition at line 142 of file WrappedTF1.h.

◆ DoEvalPar()

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

evaluate function passing coordinates x and vector of parameters

Implements ROOT::Math::IParametricFunctionOneDim.

Definition at line 133 of file WrappedTF1.h.

◆ DoParameterDerivative()

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

evaluate the derivative of the function with respect to the parameters

Implements ROOT::Math::IParametricGradFunctionOneDim.

Definition at line 119 of file WrappedTF1.cxx.

◆ FdF()

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

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

Reimplemented from ROOT::Math::IGradientFunctionOneDim.

Definition at line 116 of file WrappedTF1.h.

◆ GetDerivPrecision()

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

get precision value used for calculating the derivative step-size

Definition at line 147 of file WrappedTF1.cxx.

◆ NPar()

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

return number of parameters

Implements ROOT::Math::IBaseParam.

Definition at line 97 of file WrappedTF1.h.

◆ operator=()

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

Assignment operator.

Definition at line 83 of file WrappedTF1.cxx.

◆ ParameterGradient()

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

evaluate the derivative of the function with respect to the parameters

Reimplemented from ROOT::Math::IParametricGradFunctionOneDim.

Definition at line 95 of file WrappedTF1.cxx.

◆ ParameterName()

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

return parameter name (this is stored in TF1)

Reimplemented from ROOT::Math::IBaseParam.

Definition at line 104 of file WrappedTF1.h.

◆ Parameters()

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

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

Implements ROOT::Math::IBaseParam.

Definition at line 82 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 142 of file WrappedTF1.cxx.

◆ SetParameters()

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

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 159 of file WrappedTF1.h.

◆ fLinear

bool ROOT::Math::WrappedTF1::fLinear
private

Definition at line 157 of file WrappedTF1.h.

◆ fPolynomial

bool ROOT::Math::WrappedTF1::fPolynomial
private

Definition at line 158 of file WrappedTF1.h.

◆ fX

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

Definition at line 160 of file WrappedTF1.h.

Libraries for ROOT::Math::WrappedTF1:

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