Base class for GSL Root-Finding algorithms for one dimensional functions which do not use function derivatives.

For finding the roots users should not use this class directly but instantiate the derived classes, for example ROOT::Math::Roots::Brent for using the Brent algorithm. All the classes defining the alhorithms are defined in the header Math/RootFinderAlgorithm.h They possible types implementing root bracketing algorithms which they do not require function derivatives are:

See also the specific classes for the documentation. See the GSL online manual for information on the GSL Root-Finding algorithms

Definition at line 73 of file GSLRootFinder.h.

Public Types
typedef double(*	GSLFuncPointer) (double, void *)

Public Member Functions
	GSLRootFinder ()

virtual	~GSLRootFinder ()

int	Iterate ()
	This method is implemented only by the GSLRootFinder and GSLRootFinderDeriv classes and will return an error if it's not one of them. More...

int	Iterations () const
	Return number of iterations. More...

const char *	Name () const
	double GSLRootFinder::XLower() const { return fXlow; } More...

double	Root () const
	Returns the previously calculated root. More...

bool	SetFunction (const IGenFunction &f, double xlow, double xup)
	Sets the function for the rest of the algorithms. More...

virtual bool	SetFunction (const ROOT::Math::IGenFunction &, double, double)
	Sets the function for the rest of the algorithms. More...

virtual bool	SetFunction (const ROOT::Math::IGradFunction &, double)
	Sets the function for algorithms using derivatives. More...

bool	SetFunction (GSLFuncPointer f, void *params, double xlow, double xup)

bool	Solve (int maxIter=100, double absTol=1E-8, double relTol=1E-10)
	Find the root. More...

int	Status () const
	Return the status of last root finding. More...

Public Member Functions inherited from ROOT::Math::IRootFinderMethod
	IRootFinderMethod ()
	Default Constructor. More...

virtual	~IRootFinderMethod ()
	Default Destructor. More...

virtual int	Iterate ()
	This method is implemented only by the GSLRootFinder and GSLRootFinderDeriv classes and will return an error if it's not one of them. More...

virtual int	Iterations () const
	Return number of iterations used to find the root Must be implemented by derived classes. More...

virtual const char *	Name () const =0
	Return name of root finder algorithm. More...

virtual double	Root () const =0
	Returns the previously calculated root. More...

virtual bool	SetFunction (const ROOT::Math::IGenFunction &, double, double)
	Sets the function for the rest of the algorithms. More...

virtual bool	SetFunction (const ROOT::Math::IGradFunction &, double)
	Sets the function for algorithms using derivatives. More...

virtual bool	Solve (int maxIter=100, double absTol=1E-8, double relTol=1E-10)=0
	Stimates the root for the function. More...

virtual int	Status () const =0
	Returns the status of the previous estimate. More...

Protected Member Functions
void	FreeSolver ()

void	SetSolver (GSLRootFSolver *s)

Private Member Functions
	GSLRootFinder (const GSLRootFinder &)

GSLRootFinder &	operator= (const GSLRootFinder &)

Private Attributes
GSLFunctionWrapper *	fFunction

int	fIter

double	fRoot

GSLRootFSolver *	fS

int	fStatus

bool	fValidInterval

double	fXlow

double	fXup

#include <Math/GSLRootFinder.h>

Inheritance diagram for ROOT::Math::GSLRootFinder:

[legend]

Member Typedef Documentation

◆ GSLFuncPointer

typedef double(* ROOT::Math::GSLRootFinder::GSLFuncPointer) (double, void *)

Definition at line 96 of file GSLRootFinder.h.

Constructor & Destructor Documentation

◆ GSLRootFinder() [1/2]

ROOT::Math::GSLRootFinder::GSLRootFinder ( )

Definition at line 49 of file GSLRootFinder.cxx.

◆ ~GSLRootFinder()

ROOT::Math::GSLRootFinder::~GSLRootFinder ( )

virtual

Definition at line 59 of file GSLRootFinder.cxx.

◆ GSLRootFinder() [2/2]

ROOT::Math::GSLRootFinder::GSLRootFinder ( const GSLRootFinder & )

private

Definition at line 65 of file GSLRootFinder.cxx.

Member Function Documentation

◆ FreeSolver()

void ROOT::Math::GSLRootFinder::FreeSolver ( )

protected

Definition at line 113 of file GSLRootFinder.cxx.

◆ Iterate()

int ROOT::Math::GSLRootFinder::Iterate ( )

virtual

This method is implemented only by the GSLRootFinder and GSLRootFinderDeriv classes and will return an error if it's not one of them.

Reimplemented from ROOT::Math::IRootFinderMethod.

Definition at line 118 of file GSLRootFinder.cxx.

◆ Iterations()

int ROOT::Math::GSLRootFinder::Iterations ( ) const

inlinevirtual

Return number of iterations.

Reimplemented from ROOT::Math::IRootFinderMethod.

Definition at line 114 of file GSLRootFinder.h.

◆ Name()

const char * ROOT::Math::GSLRootFinder::Name ( ) const

virtual

double GSLRootFinder::XLower() const { return fXlow; }

double GSLRootFinder::XUpper() const { return fXup; }

Implements ROOT::Math::IRootFinderMethod.

Definition at line 159 of file GSLRootFinder.cxx.

◆ operator=()

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

private

Definition at line 69 of file GSLRootFinder.cxx.

◆ Root()

double ROOT::Math::GSLRootFinder::Root ( ) const

virtual

Returns the previously calculated root.

Implements ROOT::Math::IRootFinderMethod.

Definition at line 146 of file GSLRootFinder.cxx.

◆ SetFunction() [1/4]

bool ROOT::Math::GSLRootFinder::SetFunction	(	const IGenFunction &	,
		double	,
		double
	)

virtual

Sets the function for the rest of the algorithms.

The parameters set the interval where the root has to be calculated.

Reimplemented from ROOT::Math::IRootFinderMethod.

Definition at line 93 of file GSLRootFinder.cxx.

◆ SetFunction() [2/4]

virtual bool ROOT::Math::IRootFinderMethod::SetFunction	(	const ROOT::Math::IGenFunction &	,
		double	,
		double
	)

inlinevirtual

Sets the function for the rest of the algorithms.

The parameters set the interval where the root has to be calculated.

Reimplemented from ROOT::Math::IRootFinderMethod.

Definition at line 53 of file IRootFinderMethod.h.

◆ SetFunction() [3/4]

virtual bool ROOT::Math::IRootFinderMethod::SetFunction	(	const ROOT::Math::IGradFunction &	,
		double
	)

inlinevirtual

Sets the function for algorithms using derivatives.

Reimplemented from ROOT::Math::IRootFinderMethod.

Definition at line 45 of file IRootFinderMethod.h.

◆ SetFunction() [4/4]

bool ROOT::Math::GSLRootFinder::SetFunction	(	GSLFuncPointer	f,
		void *	params,
		double	xlow,
		double	xup
	)

Definition at line 77 of file GSLRootFinder.cxx.

◆ SetSolver()

void ROOT::Math::GSLRootFinder::SetSolver ( GSLRootFSolver * s )

protected

Definition at line 108 of file GSLRootFinder.cxx.

◆ Solve()

bool ROOT::Math::GSLRootFinder::Solve	(	int	maxIter = `100`,
		double	absTol = `1E-8`,
		double	relTol = `1E-10`
	)

virtual

Find the root.

Implements ROOT::Math::IRootFinderMethod.

Definition at line 164 of file GSLRootFinder.cxx.

◆ Status()

int ROOT::Math::GSLRootFinder::Status ( ) const

inlinevirtual

Return the status of last root finding.

Implements ROOT::Math::IRootFinderMethod.

Definition at line 119 of file GSLRootFinder.h.

Member Data Documentation

◆ fFunction

GSLFunctionWrapper* ROOT::Math::GSLRootFinder::fFunction

private

Definition at line 133 of file GSLRootFinder.h.

◆ fIter

int ROOT::Math::GSLRootFinder::fIter

private

Definition at line 139 of file GSLRootFinder.h.

◆ fRoot

double ROOT::Math::GSLRootFinder::fRoot

private

Definition at line 136 of file GSLRootFinder.h.

◆ fS

GSLRootFSolver* ROOT::Math::GSLRootFinder::fS

private

Definition at line 134 of file GSLRootFinder.h.

◆ fStatus

int ROOT::Math::GSLRootFinder::fStatus

private

Definition at line 140 of file GSLRootFinder.h.

◆ fValidInterval

bool ROOT::Math::GSLRootFinder::fValidInterval

private

Definition at line 141 of file GSLRootFinder.h.

◆ fXlow

double ROOT::Math::GSLRootFinder::fXlow

private

Definition at line 137 of file GSLRootFinder.h.

◆ fXup

double ROOT::Math::GSLRootFinder::fXup

private

Definition at line 138 of file GSLRootFinder.h.

Libraries for ROOT::Math::GSLRootFinder:

[legend]

Public Types

Public Member Functions

Protected Member Functions

Private Member Functions

Private Attributes

Member Typedef Documentation

◆ GSLFuncPointer

Constructor & Destructor Documentation

◆ GSLRootFinder() [1/2]

◆ ~GSLRootFinder()

◆ GSLRootFinder() [2/2]

Member Function Documentation

◆ FreeSolver()

◆ Iterate()

◆ Iterations()

◆ Name()

◆ operator=()

◆ Root()

◆ SetFunction() [1/4]

◆ SetFunction() [2/4]

◆ SetFunction() [3/4]

◆ SetFunction() [4/4]

◆ SetSolver()

◆ Solve()

◆ Status()

Member Data Documentation

◆ fFunction

◆ fIter

◆ fRoot

◆ fS

◆ fStatus

◆ fValidInterval

◆ fXlow

◆ fXup