TFitter


class description - source file - inheritance tree

class TFitter : public TVirtualFitter


    public:
TFitter TFitter(Int_t maxpar = 25) TFitter TFitter(TFitter&) virtual void ~TFitter() TClass* Class() virtual void Clear(Option_t* option) virtual Int_t ExecuteCommand(const char* command, Double_t* args, Int_t nargs) virtual void FixParameter(Int_t ipar) virtual Int_t GetErrors(Int_t ipar, Double_t& eplus, Double_t& eminus, Double_t& eparab, Double_t& globcc) virtual Int_t GetMaxIterations() virtual TObject* GetObjectFit() virtual Int_t GetParameter(Int_t ipar, char* name, Double_t& value, Double_t& verr, Double_t& vlow, Double_t& vhigh) virtual Int_t GetStats(Double_t& amin, Double_t& edm, Double_t& errdef, Int_t& nvpar, Int_t& nparx) virtual Double_t GetSumLog(Int_t i) virtual TClass* IsA() const virtual void PrintResults(Int_t level, Double_t amin) virtual void ReleaseParameter(Int_t ipar) virtual void SetFCN(void* fcn) virtual void SetFCN(void (*)(Int_t&, Double_t*, Double_t&f, Double_t*, Int_t) fcn) virtual void SetMaxIterations(Int_t niter) virtual void SetObjectFit(TObject* obj) virtual Int_t SetParameter(Int_t ipar, const char* parname, Double_t value, Double_t verr, Double_t vlow, Double_t vhigh) virtual void ShowMembers(TMemberInspector& insp, char* parent) virtual void Streamer(TBuffer& b)

Data Members

private:
Int_t fNlog Number of elements in fSunLog Double_t* fSumLog Sum of logs (array of fNlog elements)

Class Description


TFitter(Int_t maxpar)
*-*-*-*-*-*-*-*-*-*-*default constructor*-*-*-*-*-*-*-*-*-*-*-*-*
*-*                  ===================

~TFitter()
*-*-*-*-*-*-*-*-*-*-*default destructor*-*-*-*-*-*-*-*-*-*-*-*-*-*
*-*                  ==================

void Clear(Option_t *)
 reset the fitter environment

Int_t ExecuteCommand(const char *command, Double_t *args, Int_t nargs)
 Execute a fitter command;
   command : command string
   args    : list of nargs command arguments

void FixParameter(Int_t ipar)
 Fix parameter ipar.

Int_t GetErrors(Int_t ipar,Double_t &eplus, Double_t &eminus, Double_t &eparab, Double_t &globcc)
 return current errors for a parameter
   ipar     : parameter number
   eplus    : upper error
   eminus   : lower error
   eparab   : parabolic error
   globcc   : global correlation coefficient

Int_t GetMaxIterations()
 return the maximum number of allowed iterations

TObject* GetObjectFit()
 return a pointer to the current object being fitted

Int_t GetParameter(Int_t ipar,char *parname,Double_t &value,Double_t &verr,Double_t &vlow, Double_t &vhigh)
 return current values for a parameter
   ipar     : parameter number
   parname  : parameter name
   value    : initial parameter value
   verr     : initial error for this parameter
   vlow     : lower value for the parameter
   vhigh    : upper value for the parameter

Int_t GetStats(Double_t &amin, Double_t &edm, Double_t &errdef, Int_t &nvpar, Int_t &nparx)
 return global fit parameters
   amin
   edm      : estimated distance to minimum
   errdef
   nvpar    : number of variable parameters
   nparx    : total number of parameters

Double_t GetSumLog(Int_t n)
 return Sum(log(i) i=0,n
 used by log likelihood fits

void PrintResults(Int_t level, Double_t amin)
 Print fit results

void ReleaseParameter(Int_t ipar)
 Release parameter ipar.

void SetFCN(void *fcn)
 Specify the address of the fitting algorithm (from the interpreter)

void SetFCN(void (*fcn)(Int_t &, Double_t *, Double_t &f, Double_t *, Int_t))
 Specify the address of the fitting algorithm

void SetMaxIterations(Int_t niter)
 set the maximum number of iterations

void SetObjectFit(TObject *obj)
 Specify the current object to be fitted

Int_t SetParameter(Int_t ipar,const char *parname,Double_t value,Double_t verr,Double_t vlow, Double_t vhigh)
 set initial values for a parameter
   ipar     : parameter number
   parname  : parameter name
   value    : initial parameter value
   verr     : initial error for this parameter
   vlow     : lower value for the parameter
   vhigh    : upper value for the parameter



Inline Functions


            TClass* Class()
            TClass* IsA() const
               void ShowMembers(TMemberInspector& insp, char* parent)
               void Streamer(TBuffer& b)
            TFitter TFitter(TFitter&)


Author: Rene Brun 31/08/99
Last update: 2.23/03 27/09/99 14.32.25 by Rene Brun
Copyright (c) 1995-1999, The ROOT System, All rights reserved. *


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