ROOT  6.06/09
Reference Guide
Public Member Functions | Private Attributes | List of all members
ROOT::Minuit2::Quad1F Class Reference

Definition at line 17 of file Quad1F.h.

Public Member Functions

 Quad1F ()
 
 ~Quad1F ()
 
double operator() (const std::vector< double > &par) 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...
 
std::vector< doubleGradient (const std::vector< double > &par) const
 
void SetErrorDef (double up)
 add interface to set dynamically a new error definition Re-implement this function if needed. More...
 
double Up () const
 Error definition of the function. More...
 
const FCNBaseBase () const
 
- Public Member Functions inherited from ROOT::Minuit2::FCNGradientBase
virtual ~FCNGradientBase ()
 
virtual bool CheckGradient () const
 
- Public Member Functions inherited from ROOT::Minuit2::FCNBase
virtual ~FCNBase ()
 
virtual double ErrorDef () const
 Error definition of the function. More...
 
- Public Member Functions inherited from ROOT::Minuit2::GenericFunction
virtual ~GenericFunction ()
 

Private Attributes

double fErrorDef
 

#include </mnt/vdb/lsf/workspace/root-makedoc-v606/rootspi/rdoc/src/v6-06-00-patches/math/minuit2/test/MnTutorial/Quad1F.h>

+ Inheritance diagram for ROOT::Minuit2::Quad1F:
+ Collaboration diagram for ROOT::Minuit2::Quad1F:

Constructor & Destructor Documentation

ROOT::Minuit2::Quad1F::Quad1F ( )
inline

Definition at line 21 of file Quad1F.h.

ROOT::Minuit2::Quad1F::~Quad1F ( )
inline

Definition at line 23 of file Quad1F.h.

Member Function Documentation

const FCNBase* ROOT::Minuit2::Quad1F::Base ( ) const
inline

Definition at line 43 of file Quad1F.h.

std::vector<double> ROOT::Minuit2::Quad1F::Gradient ( const std::vector< double > &  par) const
inlinevirtual

Implements ROOT::Minuit2::FCNGradientBase.

Definition at line 32 of file Quad1F.h.

double ROOT::Minuit2::Quad1F::operator() ( const std::vector< double > &  x) const
inlinevirtual

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 25 of file Quad1F.h.

void ROOT::Minuit2::Quad1F::SetErrorDef ( double  )
inlinevirtual

add interface to set dynamically a new error definition Re-implement this function if needed.

Reimplemented from ROOT::Minuit2::FCNBase.

Definition at line 39 of file Quad1F.h.

Referenced by main().

double ROOT::Minuit2::Quad1F::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 41 of file Quad1F.h.

Member Data Documentation

double ROOT::Minuit2::Quad1F::fErrorDef
private

Definition at line 46 of file Quad1F.h.

Referenced by SetErrorDef(), and Up().


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