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From Anna Kreshuk:
- TLinearFitter class: Linear fitter is used to fit a set of data points with a linear
combination of specified functions (with or without weights). The "linear" in the name
stands for "linear in parameters", not variables. The main advantages,
compared to a general non-linear fitter, is that the linear fitter is considerably
faster and doesn't require setting the initial values of parameters.
The linear fitter can be used directly or through TH1::Fit and TGraph::Fit functions
When it's used directly, functions of more than 3 dimensions can be fitted.
- TFormula: a new data member fLinearParts and methods to process it are added. Now
one can create a function of the type that can be fit by the linear fitter.
Example: TFormula f("f", "x++sin(x)") is equivalent to
TFormula f("f","[0]*x + [1]*sin(x)"), but if a TH1::Fit or a TGraph::Fit is performed
with the 1st formula, it goes through the linear fitter, if it's performed with the
2nd formula, it goes through Minuit.
- TMultiGraph class: the Fit method is implemented, allowing to fit all the graphs
of a multigraph simultaneously
- TGraph, TGraphErrors, TGraphAsymmErrors, TGraphBentErrors - functions GetEXhigh(),
GetEXlow(), GetEYhigh(), GetEYlow() implemented to simplify the GraphFitChisquare()
function of the TFitter class
- TH1, TGraph, TGraph2D, TMultiGraph - changes in the Fit functions, allowing to use
the linear fitter. Fitting with "polN" functions redirected to use the linear fitter,
in cases where no options, except "range", are specified.
// @(#)root/graf:$Name: $:$Id: TMultiGraph.h,v 1.4 2002/11/06 21:16:43 brun Exp $
// Author: Rene Brun 12/10/2000
/*************************************************************************
* Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
* All rights reserved. *
* *
* For the licensing terms see $ROOTSYS/LICENSE. *
* For the list of contributors see $ROOTSYS/README/CREDITS. *
*************************************************************************/
#ifndef ROOT_TMultiGraph
#define ROOT_TMultiGraph
//////////////////////////////////////////////////////////////////////////
// //
// TMultiGraph //
// //
// A collection of TGraph objects //
// //
//////////////////////////////////////////////////////////////////////////
#ifndef ROOT_TNamed
#include "TNamed.h"
#endif
#include "TF1.h"
class TH1F;
class TAxis;
class TBrowser;
class TGraph;
class TMultiGraph : public TNamed {
protected:
TList *fGraphs; //Pointer to list of TGraphs
TList *fFunctions; //Pointer to list of functions (fits and user)
TH1F *fHistogram; //Pointer to histogram used for drawing axis
Double_t fMaximum; //Maximum value for plotting along y
Double_t fMinimum; //Minimum value for plotting along y
public:
TMultiGraph();
TMultiGraph(const char *name, const char *title);
virtual ~TMultiGraph();
virtual void Add(TGraph *graph, Option_t *chopt="");
virtual void Browse(TBrowser *b);
virtual Int_t DistancetoPrimitive(Int_t px, Int_t py);
virtual void Draw(Option_t *chopt="");
virtual Int_t Fit(const char *formula ,Option_t *option="" ,Option_t *goption="", Axis_t xmin=0, Axis_t xmax=0);
virtual Int_t Fit(TF1 *f1 ,Option_t *option="" ,Option_t *goption="", Axis_t rxmin=0, Axis_t rxmax=0);
virtual void LeastSquareLinearFit(Int_t ndata, Double_t &a0, Double_t &a1, Int_t &ifail, Double_t xmin, Double_t xmax);
virtual void LeastSquareFit(Int_t m, Double_t *a, Double_t xmin, Double_t xmax);
virtual void InitPolynom(Double_t xmin, Double_t xmax);
virtual void InitExpo(Double_t xmin, Double_t xmax);
virtual void InitGaus(Double_t xmin, Double_t xmax);
TH1F *GetHistogram() const;
TF1 *GetFunction(const char *name) const;
TList *GetListOfGraphs() const { return fGraphs; }
TList *GetListOfFunctions() const { return fFunctions; }
TAxis *GetXaxis() const;
TAxis *GetYaxis() const;
virtual void Paint(Option_t *chopt="");
virtual void Print(Option_t *chopt="") const;
virtual void RecursiveRemove(TObject *obj);
virtual void SavePrimitive(ofstream &out, Option_t *option);
virtual void SetMaximum(Double_t maximum=-1111);
virtual void SetMinimum(Double_t minimum=-1111);
ClassDef(TMultiGraph,2) //A collection of TGraph objects
};
#endif
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