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ROOT::Math::GSLMinimizer Class Reference

GSLMinimizer class.

Implementation of the ROOT::Math::Minimizer interface using the GSL multi-dimensional minimization algorithms.

See GSL doc from more info on the GSL minimization algorithms.

The class implements the ROOT::Math::Minimizer interface and can be instantiated using the ROOT plugin manager (plugin name is "GSLMultiMin"). The varius minimization algorithms (conjugatefr, conjugatepr, bfgs, etc..) can be passed as enumerations and also as a string. The default algorithm is conjugatefr (Fletcher-Reeves conjugate gradient algorithm).

Definition at line 79 of file GSLMinimizer.h.

Public Member Functions

 GSLMinimizer (const char *type)
 Constructor with a string giving name of algorithm.
 
 GSLMinimizer (ROOT::Math::EGSLMinimizerType type=ROOT::Math::kConjugateFR)
 Default constructor.
 
virtual ~GSLMinimizer ()
 Destructor.
 
virtual double CovMatrix (unsigned int, unsigned int) const
 return covariance matrices elements if the variable is fixed the matrix is zero The ordering of the variables is the same as in errors
 
virtual double Edm () const
 return expected distance reached from the minimum
 
virtual const doubleErrors () const
 return errors at the minimum
 
virtual const doubleMinGradient () const
 return pointer to gradient values at the minimum
 
virtual bool Minimize ()
 method to perform the minimization
 
virtual unsigned int NCalls () const
 number of function calls to reach the minimum
 
virtual bool ProvidesError () const
 minimizer provides error and error matrix
 
virtual void SetFunction (const ROOT::Math::IMultiGenFunction &func)
 set the function to minimize
 
virtual void SetFunction (const ROOT::Math::IMultiGradFunction &func)
 set the function to minimize
 
- Public Member Functions inherited from ROOT::Math::BasicMinimizer
 BasicMinimizer ()
 Default constructor.
 
virtual ~BasicMinimizer ()
 Destructor.
 
virtual bool FixVariable (unsigned int ivar)
 fix an existing variable
 
virtual bool GetVariableSettings (unsigned int ivar, ROOT::Fit::ParameterSettings &varObj) const
 get variable settings in a variable object (like ROOT::Fit::ParamsSettings)
 
const ROOT::Math::IMultiGradFunctionGradObjFunction () const
 return pointer to used gradient object function (NULL if gradient is not supported)
 
virtual bool IsFixedVariable (unsigned int ivar) const
 query if an existing variable is fixed (i.e.
 
virtual double MinValue () const
 return minimum function value
 
virtual unsigned int NDim () const
 number of dimensions
 
virtual unsigned int NFree () const
 number of free variables (real dimension of the problem)
 
virtual unsigned int NPar () const
 total number of parameter defined
 
const ROOT::Math::IMultiGenFunctionObjFunction () const
 return pointer to used objective function
 
void PrintResult () const
 print result of minimization
 
virtual bool ReleaseVariable (unsigned int ivar)
 release an existing variable
 
virtual bool SetFixedVariable (unsigned int, const std::string &, double)
 set fixed variable (override if minimizer supports them )
 
virtual bool SetLimitedVariable (unsigned int ivar, const std::string &name, double val, double step, double, double)
 set upper/lower limited variable (override if minimizer supports them )
 
virtual bool SetLowerLimitedVariable (unsigned int ivar, const std::string &name, double val, double step, double lower)
 set lower limit variable (override if minimizer supports them )
 
virtual bool SetUpperLimitedVariable (unsigned int ivar, const std::string &name, double val, double step, double upper)
 set upper limit variable (override if minimizer supports them )
 
virtual bool SetVariable (unsigned int ivar, const std::string &name, double val, double step)
 set free variable
 
virtual bool SetVariableLimits (unsigned int ivar, double lower, double upper)
 set the limits of an already existing variable
 
virtual bool SetVariableLowerLimit (unsigned int ivar, double lower)
 set the lower-limit of an already existing variable
 
virtual bool SetVariableStepSize (unsigned int ivar, double step)
 set the step size of an already existing variable
 
virtual bool SetVariableUpperLimit (unsigned int ivar, double upper)
 set the upper-limit of an already existing variable
 
virtual bool SetVariableValue (unsigned int ivar, double val)
 set the value of an existing variable
 
virtual bool SetVariableValues (const double *x)
 set the values of all existing variables (array must be dimensioned to the size of existing parameters)
 
virtual const doubleStepSizes () const
 accessor methods
 
const ROOT::Math::MinimTransformFunctionTransformFunction () const
 return transformation function (NULL if not having a transformation)
 
virtual int VariableIndex (const std::string &name) const
 get index of variable given a variable given a name return -1 if variable is not found
 
virtual std::string VariableName (unsigned int ivar) const
 get name of variables (override if minimizer support storing of variable names)
 
virtual const doubleX () const
 return pointer to X values at the minimum
 
- Public Member Functions inherited from ROOT::Math::Minimizer
 Minimizer ()
 Default constructor.
 
virtual ~Minimizer ()
 Destructor (no operations)
 
virtual void Clear ()
 reset for consecutive minimizations - implement if needed
 
virtual bool Contour (unsigned int ivar, unsigned int jvar, unsigned int &npoints, double *xi, double *xj)
 find the contour points (xi, xj) of the function for parameter ivar and jvar around the minimum The contour will be find for value of the function = Min + ErrorUp();
 
virtual double Correlation (unsigned int i, unsigned int j) const
 return correlation coefficient between variable i and j.
 
virtual int CovMatrixStatus () const
 return status of covariance matrix using Minuit convention {0 not calculated 1 approximated 2 made pos def , 3 accurate} Minimizer who implements covariance matrix calculation will re-implement the method
 
double ErrorDef () const
 return the statistical scale used for calculate the error is typically 1 for Chi2 and 0.5 for likelihood minimization
 
virtual bool GetCovMatrix (double *covMat) const
 Fill the passed array with the covariance matrix elements if the variable is fixed or const the value is zero.
 
virtual bool GetHessianMatrix (double *hMat) const
 Fill the passed array with the Hessian matrix elements The Hessian matrix is the matrix of the second derivatives and is the inverse of the covariance matrix If the variable is fixed or const the values for that variables are zero.
 
virtual bool GetMinosError (unsigned int ivar, double &errLow, double &errUp, int option=0)
 minos error for variable i, return false if Minos failed or not supported and the lower and upper errors are returned in errLow and errUp An extra flag specifies if only the lower (option=-1) or the upper (option=+1) error calculation is run
 
virtual double GlobalCC (unsigned int ivar) const
 return global correlation coefficient for variable i This is a number between zero and one which gives the correlation between the i-th parameter and that linear combination of all other parameters which is most strongly correlated with i.
 
virtual bool Hesse ()
 perform a full calculation of the Hessian matrix for error calculation
 
bool IsValidError () const
 return true if Minimizer has performed a detailed error validation (e.g. run Hesse for Minuit)
 
unsigned int MaxFunctionCalls () const
 max number of function calls
 
unsigned int MaxIterations () const
 max iterations
 
virtual int MinosStatus () const
 status code of Minos (to be re-implemented by the minimizers supporting Minos)
 
virtual unsigned int NIterations () const
 number of iterations to reach the minimum
 
virtual MinimizerOptions Options () const
 retrieve the minimizer options (implement derived class if needed)
 
double Precision () const
 precision of minimizer in the evaluation of the objective function ( a value <=0 corresponds to the let the minimizer choose its default one)
 
int PrintLevel () const
 minimizer configuration parameters
 
virtual void PrintResults ()
 return reference to the objective function virtual const ROOT::Math::IGenFunction & Function() const = 0;
 
virtual bool Scan (unsigned int ivar, unsigned int &nstep, double *x, double *y, double xmin=0, double xmax=0)
 scan function minimum for variable i.
 
void SetDefaultOptions ()
 reset the defaut options (defined in MinimizerOptions)
 
void SetErrorDef (double up)
 set scale for calculating the errors
 
void SetMaxFunctionCalls (unsigned int maxfcn)
 set maximum of function calls
 
void SetMaxIterations (unsigned int maxiter)
 set maximum iterations (one iteration can have many function calls)
 
void SetOptions (const MinimizerOptions &opt)
 set all options in one go
 
void SetPrecision (double prec)
 set in the minimizer the objective function evaluation precision ( a value <=0 means the minimizer will choose its optimal value automatically, i.e.
 
void SetPrintLevel (int level)
 set print level
 
void SetStrategy (int strategyLevel)
 set the strategy
 
void SetTolerance (double tol)
 set the tolerance
 
void SetValidError (bool on)
 flag to check if minimizer needs to perform accurate error analysis (e.g. run Hesse for Minuit)
 
virtual bool SetVariableInitialRange (unsigned int, double, double)
 set the initial range of an existing variable
 
template<class VariableIterator >
int SetVariables (const VariableIterator &begin, const VariableIterator &end)
 add variables . Return number of variables successfully added
 
int Status () const
 status code of minimizer
 
int Strategy () const
 strategy
 
double Tolerance () const
 absolute tolerance
 

Private Member Functions

 GSLMinimizer (const GSLMinimizer &)
 Copy constructor.
 
GSLMinimizeroperator= (const GSLMinimizer &rhs)
 Assignment operator.
 

Private Attributes

ROOT::Math::GSLMultiMinimizerfGSLMultiMin
 
double fLSTolerance
 

Additional Inherited Members

- Protected Member Functions inherited from ROOT::Math::BasicMinimizer
bool CheckDimension () const
 
bool CheckObjFunction () const
 
MinimTransformFunctionCreateTransformation (std::vector< double > &startValues, const ROOT::Math::IMultiGradFunction *func=0)
 
void SetFinalValues (const double *x)
 
void SetMinValue (double val)
 
- Protected Attributes inherited from ROOT::Math::Minimizer
MinimizerOptions fOptions
 
int fStatus
 
bool fValidError
 

#include <Math/GSLMinimizer.h>

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

Constructor & Destructor Documentation

◆ GSLMinimizer() [1/3]

ROOT::Math::GSLMinimizer::GSLMinimizer ( ROOT::Math::EGSLMinimizerType  type = ROOT::Math::kConjugateFR)

Default constructor.

Definition at line 51 of file GSLMinimizer.cxx.

◆ GSLMinimizer() [2/3]

ROOT::Math::GSLMinimizer::GSLMinimizer ( const char *  type)

Constructor with a string giving name of algorithm.

Definition at line 66 of file GSLMinimizer.cxx.

◆ ~GSLMinimizer()

ROOT::Math::GSLMinimizer::~GSLMinimizer ( )
virtual

Destructor.

Definition at line 93 of file GSLMinimizer.cxx.

◆ GSLMinimizer() [3/3]

ROOT::Math::GSLMinimizer::GSLMinimizer ( const GSLMinimizer )
inlineprivate

Copy constructor.

Definition at line 104 of file GSLMinimizer.h.

Member Function Documentation

◆ CovMatrix()

virtual double ROOT::Math::GSLMinimizer::CovMatrix ( unsigned int  ,
unsigned int   
) const
inlinevirtual

return covariance matrices elements if the variable is fixed the matrix is zero The ordering of the variables is the same as in errors

Reimplemented from ROOT::Math::Minimizer.

Definition at line 149 of file GSLMinimizer.h.

◆ Edm()

virtual double ROOT::Math::GSLMinimizer::Edm ( ) const
inlinevirtual

return expected distance reached from the minimum

Reimplemented from ROOT::Math::Minimizer.

Definition at line 127 of file GSLMinimizer.h.

◆ Errors()

virtual const double * ROOT::Math::GSLMinimizer::Errors ( ) const
inlinevirtual

return errors at the minimum

Reimplemented from ROOT::Math::Minimizer.

Definition at line 141 of file GSLMinimizer.h.

◆ MinGradient()

const double * ROOT::Math::GSLMinimizer::MinGradient ( ) const
virtual

return pointer to gradient values at the minimum

Reimplemented from ROOT::Math::Minimizer.

Definition at line 288 of file GSLMinimizer.cxx.

◆ Minimize()

bool ROOT::Math::GSLMinimizer::Minimize ( )
virtual

method to perform the minimization

Reimplemented from ROOT::Math::BasicMinimizer.

Definition at line 123 of file GSLMinimizer.cxx.

◆ NCalls()

unsigned int ROOT::Math::GSLMinimizer::NCalls ( ) const
virtual

number of function calls to reach the minimum

Reimplemented from ROOT::Math::Minimizer.

Definition at line 112 of file GSLMinimizer.cxx.

◆ operator=()

GSLMinimizer & ROOT::Math::GSLMinimizer::operator= ( const GSLMinimizer rhs)
inlineprivate

Assignment operator.

Definition at line 109 of file GSLMinimizer.h.

◆ ProvidesError()

virtual bool ROOT::Math::GSLMinimizer::ProvidesError ( ) const
inlinevirtual

minimizer provides error and error matrix

Reimplemented from ROOT::Math::Minimizer.

Definition at line 138 of file GSLMinimizer.h.

◆ SetFunction() [1/2]

void ROOT::Math::GSLMinimizer::SetFunction ( const ROOT::Math::IMultiGenFunction func)
virtual

set the function to minimize

Reimplemented from ROOT::Math::BasicMinimizer.

Definition at line 100 of file GSLMinimizer.cxx.

◆ SetFunction() [2/2]

virtual void ROOT::Math::GSLMinimizer::SetFunction ( const ROOT::Math::IMultiGradFunction func)
inlinevirtual

set the function to minimize

Reimplemented from ROOT::Math::BasicMinimizer.

Definition at line 120 of file GSLMinimizer.h.

Member Data Documentation

◆ fGSLMultiMin

ROOT::Math::GSLMultiMinimizer* ROOT::Math::GSLMinimizer::fGSLMultiMin
private

Definition at line 159 of file GSLMinimizer.h.

◆ fLSTolerance

double ROOT::Math::GSLMinimizer::fLSTolerance
private

Definition at line 161 of file GSLMinimizer.h.

Libraries for ROOT::Math::GSLMinimizer:

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