ROOT::Math::LSResidualFunc Class Reference

LSResidualFunc class description.

Internal class used for accessing the residuals of the Least Square function and their derivates which are estimated numerically using GSL numerical derivation. The class contains a pointer to the fit method function and an index specifying the i-th residual and wraps it in a multi-dim gradient function interface ROOT::Math::IGradientFunctionMultiDim. The class is used by ROOT::Math::GSLNLSMinimizer (GSL non linear least square fitter)

Definition at line 67 of file GSLNLSMinimizer.h.

Public Member Functions
	LSResidualFunc ()
	LSResidualFunc (const ROOT::Math::FitMethodFunction &func, unsigned int i)
	LSResidualFunc (const LSResidualFunc &rhs)
IMultiGenFunction *	Clone () const
	Clone a function. More...
void	FdF (const double *x, double &f, double *g) const
	Optimized method to evaluate at the same time the function value and derivative at a point x. More...
void	Gradient (const double *x, double *g) const
	Evaluate all the vector of function derivatives (gradient) at a point x. More...
unsigned int	NDim () const
	Retrieve the dimension of the function. More...
LSResidualFunc &	operator= (const LSResidualFunc &rhs)
Public Member Functions inherited from ROOT::Math::IGradientFunctionMultiDim
virtual	~IGradientFunctionMultiDim ()
	Virtual Destructor (no operations) More...
Public Member Functions inherited from ROOT::Math::IBaseFunctionMultiDimTempl< T >
	IBaseFunctionMultiDimTempl ()
virtual	~IBaseFunctionMultiDimTempl ()
	virtual destructor More...
T	operator() (const T *x) const
	Evaluate the function at a point x[]. More...
Public Member Functions inherited from ROOT::Math::IGradientMultiDim
virtual	~IGradientMultiDim ()
	virual destructor More...
double	Derivative (const double *x, unsigned int icoord=0) const
	Return the partial derivative with respect to the passed coordinate. More...

Private Member Functions
double	DoDerivative (const double *x, unsigned int icoord) const
	function to evaluate the derivative with respect each coordinate. More...
double	DoEval (const double *x) const

Private Attributes
const ROOT::Math::FitMethodFunction *	fChi2
unsigned int	fIndex
std::vector< double >	fX2

Additional Inherited Members
Public Types inherited from ROOT::Math::IGradientFunctionMultiDim
typedef IBaseFunctionMultiDim	BaseFunc
typedef IGradientMultiDim	BaseGrad
Public Types inherited from ROOT::Math::IBaseFunctionMultiDimTempl< T >
typedef IBaseFunctionMultiDimTempl< T >	BaseFunc

#include <Math/GSLNLSMinimizer.h>

Inheritance diagram for ROOT::Math::LSResidualFunc:

Constructor & Destructor Documentation

LSResidualFunc() [1/3]

ROOT::Math::LSResidualFunc::LSResidualFunc ( )

inline

Definition at line 71 of file GSLNLSMinimizer.h.

LSResidualFunc() [2/3]

ROOT::Math::LSResidualFunc::LSResidualFunc ( const ROOT::Math::FitMethodFunction &  func, unsigned int  i  )

inline

Definition at line 75 of file GSLNLSMinimizer.h.

LSResidualFunc() [3/3]

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

inline

Definition at line 83 of file GSLNLSMinimizer.h.

Member Function Documentation

Clone()

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

inlinevirtual

Clone a function.

Each derived class must implement their version of the Clone method

Implements ROOT::Math::IBaseFunctionMultiDimTempl< T >.

Definition at line 99 of file GSLNLSMinimizer.h.

DoDerivative()

double ROOT::Math::LSResidualFunc::DoDerivative ( const double *  x, unsigned int  icoord  ) const

inlineprivatevirtual

function to evaluate the derivative with respect each coordinate.

To be implemented by the derived class

Implements ROOT::Math::IGradientMultiDim.

Definition at line 129 of file GSLNLSMinimizer.h.

DoEval()

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

inlineprivate

Definition at line 125 of file GSLNLSMinimizer.h.

FdF()

void ROOT::Math::LSResidualFunc::FdF ( const double *  x, double &  f, double *  df  ) const

inlinevirtual

Optimized method to evaluate at the same time the function value and derivative at a point x.

Often both value and derivatives are needed and it is often more efficient to compute them at the same time. Derived class should implement this method if performances play an important role and if it is faster to evaluate value and derivative at the same time

Reimplemented from ROOT::Math::IGradientFunctionMultiDim.

Definition at line 110 of file GSLNLSMinimizer.h.

Gradient()

void ROOT::Math::LSResidualFunc::Gradient ( const double *  x, double *  grad  ) const

inlinevirtual

Evaluate all the vector of function derivatives (gradient) at a point x.

Derived classes must re-implement it if more efficient than evaluting one at a time

Reimplemented from ROOT::Math::IGradientFunctionMultiDim.

Definition at line 105 of file GSLNLSMinimizer.h.

NDim()

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

inlinevirtual

Retrieve the dimension of the function.

Implements ROOT::Math::IBaseFunctionMultiDimTempl< T >.

Definition at line 103 of file GSLNLSMinimizer.h.

operator=()

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

inline

Definition at line 91 of file GSLNLSMinimizer.h.

Member Data Documentation

fChi2

const ROOT::Math::FitMethodFunction* ROOT::Math::LSResidualFunc::fChi2

private

Definition at line 138 of file GSLNLSMinimizer.h.

fIndex

unsigned int ROOT::Math::LSResidualFunc::fIndex

private

Definition at line 137 of file GSLNLSMinimizer.h.

fX2

std::vector<double> ROOT::Math::LSResidualFunc::fX2

mutableprivate

Definition at line 139 of file GSLNLSMinimizer.h.

---

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

• math/mathmore/inc/Math/GSLNLSMinimizer.h