ROOT::Minuit2::ParametricFunction Class Reference

Function which has parameters.

For example, one could define a one-dimensional Gaussian, by considering x as an input coordinate for the evaluation of the function, and the mean and the square root of the variance as parameters.

AS OF NOW PARAMETRICFUNCTION INHERITS FROM FCNBASE INSTEAD OF GENERICFUNCTION. THIS IS ONLY BECAUSE NUMERICAL2PGRADIENTCALCULATOR NEEDS AN FCNBASE OBJECT AND WILL BE CHANGED!!!!!!!!!!!!!!!!

Definition at line 43 of file ParametricFunction.h.

Public Member Functions
	ParametricFunction (const std::vector< double > &params)
	Constructor which initializes the ParametricFunction with the parameters given as input.
	ParametricFunction (int nparams)
	Constructor which initializes the ParametricFunction by setting the number of parameters.
virtual	~ParametricFunction ()
virtual std::vector< double >	GetGradient (const std::vector< double > &x) const
	Member function returning the Gradient of the function with respect to its variables (but without including gradients with respect to its internal parameters).
virtual const std::vector< double > &	GetParameters () const
	Accessor for the state of the parameters.
virtual unsigned int	NumberOfParameters () const
	Accessor for the number of parameters.
virtual double	operator() (const std::vector< double > &x) const =0
	Evaluates the function with the given coordinates.
virtual double	operator() (const std::vector< double > &x, const std::vector< double > &params) const
	Evaluates the function with the given coordinates and Parameter values.
virtual void	SetParameters (const std::vector< double > &params) const
	Sets the parameters of the ParametricFunction.
Public Member Functions inherited from ROOT::Minuit2::FCNBase
virtual	~FCNBase ()
virtual double	ErrorDef () const
	Error definition of the function.
virtual void	SetErrorDef (double)
	add interface to set dynamically a new error definition Re-implement this function if needed.
virtual double	Up () const =0
	Error definition of the function.
Public Member Functions inherited from ROOT::Minuit2::GenericFunction
virtual	~GenericFunction ()

Protected Attributes
std::vector< double >	par
	The vector containing the parameters of the function It is mutable for "historical reasons" as in the hierarchy methods and classes are const and all the implications of changing them back to non-const are not clear.

#include <Minuit2/ParametricFunction.h>

Inheritance diagram for ROOT::Minuit2::ParametricFunction:

Constructor & Destructor Documentation

ParametricFunction() [1/2]

ROOT::Minuit2::ParametricFunction::ParametricFunction ( const std::vector< double > &  params )

inline

Constructor which initializes the ParametricFunction with the parameters given as input.

Parameters

params

vector containing the initial Parameter values

Definition at line 55 of file ParametricFunction.h.

ParametricFunction() [2/2]

ROOT::Minuit2::ParametricFunction::ParametricFunction ( int  nparams )

inline

Constructor which initializes the ParametricFunction by setting the number of parameters.

Parameters

nparams

number of parameters of the parametric function

Definition at line 66 of file ParametricFunction.h.

~ParametricFunction()

virtual ROOT::Minuit2::ParametricFunction::~ParametricFunction ( )

inlinevirtual

Definition at line 68 of file ParametricFunction.h.

Member Function Documentation

GetGradient()

std::vector< double > ROOT::Minuit2::ParametricFunction::GetGradient ( const std::vector< double > &  x ) const

virtual

Member function returning the Gradient of the function with respect to its variables (but without including gradients with respect to its internal parameters).

Parameters

x	vector containing the coordinates of the point where the Gradient is to be calculated.

Returns

the Gradient vector of the function at the given point.

Definition at line 24 of file ParametricFunction.cxx.

GetParameters()

virtual const std::vector< double > & ROOT::Minuit2::ParametricFunction::GetParameters ( ) const

inlinevirtual

Accessor for the state of the parameters.

Returns

vector containing the present Parameter settings

Definition at line 93 of file ParametricFunction.h.

NumberOfParameters()

virtual unsigned int ROOT::Minuit2::ParametricFunction::NumberOfParameters ( ) const

inlinevirtual

Accessor for the number of parameters.

Returns

the number of function parameters

Definition at line 102 of file ParametricFunction.h.

operator()() [1/2]

virtual double ROOT::Minuit2::ParametricFunction::operator() ( const std::vector< double > &  x ) const

pure virtual

Evaluates the function with the given coordinates.

Parameters

x	vector containing the input coordinates

Returns

the result of the function evaluation with the given coordinates.

Implements ROOT::Minuit2::FCNBase.

operator()() [2/2]

virtual double ROOT::Minuit2::ParametricFunction::operator() ( const std::vector< double > &  x, const std::vector< double > &  params  ) const

inlinevirtual

Evaluates the function with the given coordinates and Parameter values.

This member function is useful to implement when speed is an issue as it is faster to call only one function instead of two (SetParameters and operator()). The default implementation, provided for convenience, does the latter.

Parameters

x	vector containing the input coordinates
params	vector containing the Parameter values

Returns

the result of the function evaluation with the given coordinates and parameters

Definition at line 137 of file ParametricFunction.h.

SetParameters()

virtual void ROOT::Minuit2::ParametricFunction::SetParameters ( const std::vector< double > &  params ) const

inlinevirtual

Sets the parameters of the ParametricFunction.

Parameters

params

vector containing the Parameter values

Definition at line 78 of file ParametricFunction.h.

Member Data Documentation

par

std::vector<double> ROOT::Minuit2::ParametricFunction::par

mutableprotected

The vector containing the parameters of the function It is mutable for "historical reasons" as in the hierarchy methods and classes are const and all the implications of changing them back to non-const are not clear.

Definition at line 168 of file ParametricFunction.h.

Libraries for ROOT::Minuit2::ParametricFunction:

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

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