ROOT  6.06/09
Reference Guide
Public Member Functions | Private Attributes | List of all members
ROOT::Minuit2::GaussFcn2 Class Reference

Definition at line 22 of file GaussFcn2.h.

Public Member Functions

 GaussFcn2 (const std::vector< double > &meas, const std::vector< double > &pos, const std::vector< double > &mvar)
 
 ~GaussFcn2 ()
 
virtual void Init ()
 
virtual double Up () const
 Error definition of the function. More...
 
virtual double operator() (const std::vector< double > &) const
 The meaning of the vector of parameters is of course defined by the user, who uses the values of those parameters to calculate their function Value. More...
 
virtual double ErrorDef () const
 Error definition of the function. More...
 
std::vector< doubleMeasurements () const
 
std::vector< doublePositions () const
 
std::vector< doubleVariances () const
 
- Public Member Functions inherited from ROOT::Minuit2::FCNBase
virtual ~FCNBase ()
 
virtual void SetErrorDef (double)
 add interface to set dynamically a new error definition Re-implement this function if needed. More...
 
- Public Member Functions inherited from ROOT::Minuit2::GenericFunction
virtual ~GenericFunction ()
 

Private Attributes

std::vector< doublefMeasurements
 
std::vector< doublefPositions
 
std::vector< doublefMVariances
 
double fMin
 

#include </mnt/vdb/lsf/workspace/root-makedoc-v606/rootspi/rdoc/src/v6-06-00-patches/math/minuit2/test/MnSim/GaussFcn2.h>

+ Inheritance diagram for ROOT::Minuit2::GaussFcn2:
+ Collaboration diagram for ROOT::Minuit2::GaussFcn2:

Constructor & Destructor Documentation

ROOT::Minuit2::GaussFcn2::GaussFcn2 ( const std::vector< double > &  meas,
const std::vector< double > &  pos,
const std::vector< double > &  mvar 
)
inline

Definition at line 26 of file GaussFcn2.h.

ROOT::Minuit2::GaussFcn2::~GaussFcn2 ( )
inline

Definition at line 32 of file GaussFcn2.h.

Member Function Documentation

virtual double ROOT::Minuit2::GaussFcn2::ErrorDef ( ) const
inlinevirtual

Error definition of the function.

MINUIT defines Parameter errors as the change in Parameter Value required to change the function Value by up. Normally, for chisquared fits it is 1, and for negative log likelihood, its Value is 0.5. If the user wants instead the 2-sigma errors for chisquared fits, it becomes 4, as Chi2(x+n*sigma) = Chi2(x) + n*n.

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Reimplemented from ROOT::Minuit2::FCNBase.

Definition at line 38 of file GaussFcn2.h.

void ROOT::Minuit2::GaussFcn2::Init ( )
virtual

Definition at line 37 of file GaussFcn2.cxx.

Referenced by GaussFcn2().

std::vector<double> ROOT::Minuit2::GaussFcn2::Measurements ( ) const
inline

Definition at line 40 of file GaussFcn2.h.

Referenced by main().

double ROOT::Minuit2::GaussFcn2::operator() ( const std::vector< double > &  x) const
virtual

The meaning of the vector of parameters is of course defined by the user, who uses the values of those parameters to calculate their function Value.

The order and the position of these parameters is strictly the one specified by the user when supplying the starting values for minimization. The starting values must be specified by the user, either via an std::vector<double> or the MnUserParameters supplied as input to the MINUIT minimizers such as VariableMetricMinimizer or MnMigrad. Later values are determined by MINUIT as it searches for the Minimum or performs whatever analysis is requested by the user.

Parameters
parfunction parameters as defined by the user.
Returns
the Value of the function.
See also
MnUserParameters
VariableMetricMinimizer
MnMigrad

Implements ROOT::Minuit2::FCNBase.

Definition at line 21 of file GaussFcn2.cxx.

std::vector<double> ROOT::Minuit2::GaussFcn2::Positions ( ) const
inline

Definition at line 41 of file GaussFcn2.h.

Referenced by main().

virtual double ROOT::Minuit2::GaussFcn2::Up ( ) const
inlinevirtual

Error definition of the function.

MINUIT defines Parameter errors as the change in Parameter Value required to change the function Value by up. Normally, for chisquared fits it is 1, and for negative log likelihood, its Value is 0.5. If the user wants instead the 2-sigma errors for chisquared fits, it becomes 4, as Chi2(x+n*sigma) = Chi2(x) + n*n.

Implements ROOT::Minuit2::FCNBase.

Definition at line 36 of file GaussFcn2.h.

Referenced by ErrorDef().

std::vector<double> ROOT::Minuit2::GaussFcn2::Variances ( ) const
inline

Definition at line 42 of file GaussFcn2.h.

Member Data Documentation

std::vector<double> ROOT::Minuit2::GaussFcn2::fMeasurements
private

Definition at line 46 of file GaussFcn2.h.

Referenced by Init(), Measurements(), and operator()().

double ROOT::Minuit2::GaussFcn2::fMin
private

Definition at line 49 of file GaussFcn2.h.

Referenced by Init().

std::vector<double> ROOT::Minuit2::GaussFcn2::fMVariances
private

Definition at line 48 of file GaussFcn2.h.

Referenced by operator()(), and Variances().

std::vector<double> ROOT::Minuit2::GaussFcn2::fPositions
private

Definition at line 47 of file GaussFcn2.h.

Referenced by Init(), operator()(), and Positions().


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