TVirtualFitter*¶
Abstract base class for fitting
TVirtualFitter 继承 TNamed
class¶
TVirtualFitter();
virtual ~TVirtualFitter();
virtual Double_t Chisquare(Int_t npar, Double_t *params) const = 0;
virtual void Clear(Option_t *option="") = 0;
virtual Int_t ExecuteCommand(const char *command, Double_t *args, Int_t nargs) = 0;
virtual void FixParameter(Int_t ipar) = 0;
virtual void GetConfidenceIntervals(Int_t n, Int_t ndim, const Double_t *x, Double_t *ci, Double_t cl=0.95);
///return confidence intervals in array x of dimension ndim
///implemented in TFitter and TLinearFitter
virtual void GetConfidenceIntervals(TObject *obj, Double_t cl=0.95);
///return confidence intervals in TObject obj
///implemented in TFitter and TLinearFitter
virtual Double_t *GetCovarianceMatrix() const = 0;
virtual Double_t GetCovarianceMatrixElement(Int_t i, Int_t j) const = 0;
virtual Int_t GetErrors(Int_t ipar,Double_t &eplus, Double_t &eminus, Double_t &eparab, Double_t &globcc) const = 0;
typedef void (* FCNFunc_t )(Int_t &npar, Double_t *gin, Double_t &f, Double_t *u, Int_t flag);
virtual FCNFunc_t GetFCN() { return fFCN; }
virtual Foption_t GetFitOption() const {return fOption;}
TMethodCall *GetMethodCall() const {return fMethodCall;}
virtual Int_t GetNumberTotalParameters() const = 0;
virtual Int_t GetNumberFreeParameters() const = 0;
virtual TObject *GetObjectFit() const {return fObjectFit;}
virtual Double_t GetParError(Int_t ipar) const = 0;
virtual Double_t GetParameter(Int_t ipar) const = 0;
virtual Int_t GetParameter(Int_t ipar,char *name,Double_t &value,Double_t &verr,Double_t &vlow, Double_t &vhigh) const = 0;
virtual const char *GetParName(Int_t ipar) const = 0;
virtual Int_t GetStats(Double_t &amin, Double_t &edm, Double_t &errdef, Int_t &nvpar, Int_t &nparx) const = 0;
virtual Double_t GetSumLog(Int_t i) = 0;
virtual TObject *GetUserFunc() const {return fUserFunc;}
virtual Int_t GetXfirst() const {return fXfirst;}
virtual Int_t GetXlast() const {return fXlast;}
virtual Int_t GetYfirst() const {return fYfirst;}
virtual Int_t GetYlast() const {return fYlast;}
virtual Int_t GetZfirst() const {return fZfirst;}
virtual Int_t GetZlast() const {return fZlast;}
virtual Bool_t IsFixed(Int_t ipar) const = 0;
virtual void PrintResults(Int_t level, Double_t amin) const = 0;
virtual void ReleaseParameter(Int_t ipar) = 0;
virtual Double_t *SetCache(Int_t npoints, Int_t psize);
/// Initialize the cache array
/// npoints is the number of points to be stored (or already stored) in the cache
/// psize is the number of elements per point
/// if (npoints*psize > fCacheSize) the existing cache is deleted
/// and a new array is created.
/// The function returns a pointer to the cache
virtual void SetFCN(void *fcn);
/// To set the address of the minimization objective function
/// this function is called by CINT instead of the function above
virtual void SetFCN(void (*fcn)(Int_t &, Double_t *, Double_t &f, Double_t *, Int_t));
/// To set the address of the minimization objective function
/// called by the native compiler (see function below when called by CINT)
virtual void SetFitMethod(const char *name) = 0;
virtual void SetFitOption(Foption_t option) {fOption = option;}
virtual void SetObjectFit(TObject *obj) {fObjectFit = obj;}
virtual Int_t SetParameter(Int_t ipar,const char *parname,Double_t value,Double_t verr,Double_t vlow, Double_t vhigh) = 0;
virtual void SetUserFunc(TObject *userfunc) {fUserFunc = userfunc;}
virtual void SetXfirst(Int_t first) {fXfirst = first;}
virtual void SetXlast (Int_t last) {fXlast = last;}
virtual void SetYfirst(Int_t first) {fYfirst = first;}
virtual void SetYlast (Int_t last) {fYlast = last;}
virtual void SetZfirst(Int_t first) {fZfirst = first;}
virtual void SetZlast (Int_t last) {fZlast = last;}
static TVirtualFitter *GetFitter();/// static: return the current Fitter
static TVirtualFitter *Fitter(TObject *obj, Int_t maxpar = 25);
/// Static function returning a pointer to the current fitter.
/// If the fitter does not exist, the default TFitter is created.
/// Don't delete the returned fitter object, it will be re-used.
static const char *GetDefaultFitter();/// static: return the name of the default fitter
static Int_t GetMaxIterations();
/// static: Return the maximum number of iterations
/// actually max number of function calls
static Double_t GetErrorDef();/// static: Return the Error Definition
static Double_t GetPrecision();/// static: Return the fit relative precision
static void SetDefaultFitter(const char* name = "");/// static: set name of default fitter
static void SetFitter(TVirtualFitter *fitter, Int_t maxpar = 25);/// Static function to set an alternative fitter
static void SetMaxIterations(Int_t niter=5000);
/// static: Set the maximum number of function calls for the minimization algorithm
/// For example for MIGRAD this is the maxcalls value passed as first argument
/// (see http://wwwasdoc.web.cern.ch/wwwasdoc/minuit/node18.html )
static void SetErrorDef(Double_t errdef=1);
/// static: Set the Error Definition (default=1)
/// For Minuit this is the value passed with the "SET ERR" command
/// (see http://wwwasdoc.web.cern.ch/wwwasdoc/minuit/node18.html)
static void SetPrecision(Double_t prec=1e-6);
/// static: Set the tolerance used in the minimization algorithm
/// For example for MIGRAD this is tolerance value passed as second argument
/// (see http://wwwasdoc.web.cern.ch/wwwasdoc/minuit/node18.html )