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/Go4FitExample/Example1.cxx

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00001 //---------------------------------------------------------------
00002 //        Go4 Release Package v2.10-5 (build 21005) 
00003 //                      03-Nov-2005
00004 //---------------------------------------------------------------
00005 //       The GSI Online Offline Object Oriented (Go4) Project
00006 //       Experiment Data Processing at DVEE department, GSI
00007 //---------------------------------------------------------------
00008 //
00009 //Copyright (C) 2000- Gesellschaft f. Schwerionenforschung, GSI
00010 //                    Planckstr. 1, 64291 Darmstadt, Germany
00011 //Contact:            http://go4.gsi.de
00012 //----------------------------------------------------------------
00013 //This software can be used under the license agreements as stated
00014 //in Go4License.txt file which is part of the distribution.
00015 //----------------------------------------------------------------
00016 /* Go4Fit Examples
00017    This is small examples how to fit part of histogram
00018    with two gaussian and polynom function
00019 */
00020 
00021 #ifndef __CINT__
00022 
00023 #include "TH1.h"
00024 #include "TFile.h"
00025 #include "TApplication.h"
00026 
00027 #include "../Go4Fit/TGo4Fitter.h"
00028 
00029 void Example1();
00030 
00031 int main(int argc, char **argv)
00032 {
00033    TApplication theApp("Application", 0, 0);
00034 
00035    Example1();
00036 
00037    theApp.Run();
00038 
00039    return 0;
00040 }
00041 
00042 #endif
00043 
00044 // routine to read histogram from examples file
00045 TH1D* GetHistogram(const char* HistogramName) {
00046    TFile f1("histograms.root");
00047    TH1D* histo = (TH1D*) f1.Get(HistogramName);
00048    histo->SetDirectory(0);
00049    return histo;
00050 }
00051 
00052 void Example1()
00053 {
00054 // create fitter, select fit function and add standard actions list
00055    TGo4Fitter fitter("Fitter", TGo4Fitter::ff_ML_Poisson, kTRUE);
00056 
00057 // add histogram to fitter, which should be fitted
00058    fitter.AddH1("data1", GetHistogram("hDeg120_P_c"), kTRUE, 2200., 2900.);
00059 
00060 // create polynom of first order
00061    fitter.AddPolynomX("data1", "Pol", 1);
00062 
00063 // create two gaussians
00064    fitter.AddGauss1("data1", "Gauss1", 2553., 15.);
00065    fitter.AddGauss1("data1", "Gauss2", 2672., 15.);
00066 
00067 // execute all actions
00068    fitter.DoActions();
00069 
00070 // draw data, full model and two gaussains on new canvas
00071    fitter.Draw("#data1,Gauss1,Gauss2");
00072 }
00073 
00074 //----------------------------END OF GO4 SOURCE FILE ---------------------

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