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Hist_Fit.C
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Hist_Fit.C
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//** My simple Macro to Fit hists ***/
//Run AS
//root[0] .L Hist_Fit.C
//root[1] .X Hist_Fit.C
// Designed by 10Sr @2013 // norbe072@umn.edu
#include "TObject.h"
#include "TF1.h"
#include "TFile.h"
#include "TH1.h"
#include "TH1D.h"
#include "TFrame.h"
#include "TCanvas.h"
#include "TLegend.h"
#include "Riostream.h"
#include "TDirectory.h"
#include "TKey.h"
#include "TString.h"
#include "TStyle.h"
#include "TSystem.h"
#include "TMath.h"
#include "TROOT.h"
#include <iostream>
#include <string>
#include <cmath>
using namespace std;
//gROOT->Reset();
//gROOT->Clear();
double gauss2D(double *x, double *par) {
double z1 = 0;
if(par[2] != 0) z1 = double((x[0]-par[1])/par[2]);
double z2 = 0;
if(par[4] != 0 ) z2 = double((x[1]-par[3])/par[4]);
return par[0]*exp(-0.5*(z1*z1+z2*z2));
}
// private Defined gaus fxn
//
double mygaus(double *t, double *par){
double x = t[0];
double arg0 = par[0];
double arg1 = 0;
if(par[2] != 0) arg1 =double( ( x - par[1])/par[2] );
double f = arg0*TMath::Exp(-0.5*arg1*arg1);
return f;
}
//doing it the D**way
double low0 = -3.69;
double high0 = 2.41;
double low1 = 2.41;
double high1 = 3.39; //3.44
double low2 = 3.39; //3.44
double high2 = 5.30; //5.67
double low3 = 5.30; //5.67
double high3 = 8.1907;
double low4 = 8.1907;
double high4 = 10.63;
double low5 = 10.63;
double high5 = 13.2425;
double low6 = 13.2425;
double high6 = 15.8741;
double low7 = 15.8741;
double high7 = 18.7171;
double low8 = 18.7171;
double high8 = 23.9229;
double par[24];
//Generating Fit Function to Use//
TF1* g0 = new TF1("g0","gaus", low0, high0);
TF1* g1 = new TF1("g1","gaus", low1, high1);
TF1* g2 = new TF1("g2","gaus", low2, high2);
TF1* g3 = new TF1("g3","gaus", low3, high3);
TF1* g4 = new TF1("g4","gaus", low4, high4);
TF1* g5 = new TF1("g5","gaus", low5, high5);
TF1* g6 = new TF1("g6","gaus", low6, high6);
TF1* g7 = new TF1("g7","gaus", low7, high7);
TF1* g8 = new TF1("g8","gaus", low8, high8);
//double fitf(double *t, double *par){
TF1* fitf = new TF1("fitf", "gaus(0) + gaus(3) + gaus(6) + gaus(9) + gaus(12) + gaus(15) + gaus(18) + gaus(21) + gaus(24)", -5.0 , 25.0);
// double fitfunc += gaus(0) + gaus(3) + gaus(6) + gaus(9) + gaus(12) + gaus(15) + gaus(18) + gaus(21) + gaus(24);
// return fitfunc;
//}
//ALternative
TF1* TotalFitfxn(double *t, double *par){
double fxn = mygaus(t,par[0]) + mygaus(t,par[3]) + mygaus(t, par[6]) + mygaus(t,par[9]) + mygaus(t, par[12]) + mygaus(t,par[15]) + mygaus(t,par[18]) +mygau(t,par[21]) + mygaus(t,par[24]);
return fxn;
}
TF1 *fitFcn = fitf;
//TF1 *fitFcn = 0;
TH1F *IhistEEM = 0;
TH1F *IhistEEP = 0;
TH1F *IhistEB = 0;
//*** Main Fitting Fxn *****//
void Hist_Fit(char *Ifile){
TFile *ifile = new TFile(Ifile);
IhistEEM = (TH1F*)ifile->Get("BkgEst/my.ALL_EEM_pho_time"); // use EE- to get fit fxn and try in on EE+
IhistEEP = (TH1F*)ifile->Get("BkgEst/my.ALL_EEP_pho_time");
IhistEB = (TH1F*)ifile->Get("BkgEst/my.g_timeEB");
// gDirectory->GetObject("BkgEst/my.ALL_EEM_pho_time;1", IhistEEM);
// gDirectory->GetObject("BkgEst/my.ALL_EEP_pho_time;1", IhistEEP);
if(IhistEEM == 0){ std::cout <<"!! Histogram Does not exist!!" << std::endl; throw 1;}
if(IhistEEP == 0){ std::cout <<"!! Histogram Does not exist!!" << std::endl; throw 1;}
// fitFcn = new TF1("Totalfitfunc", "gaus(0) + gaus(3) + gaus(6) + gaus(9) + gaus(12) + gaus(15) + gaus(18) + gaus(21) + gaus(24)", -5.0 , 25.0,24);
// fitFcn = new TF1("fitFcn", fitf, -5.0, 25.0, 24);
fitFcn->SetNpx(500);
fitFcn->SetLineWidth(4);
fitFcn->SetLineColor(kBlue);
// Fit Each fxn and Add it to the List
IhistEEM->Fit(g0, "R");
IhistEEM->Fit(g1, "R+");
IhistEEM->Fit(g2, "R+");
IhistEEM->Fit(g3, "R+");
IhistEEM->Fit(g4, "R+");
IhistEEM->Fit(g5, "R+");
IhistEEM->Fit(g6, "R+");
IhistEEM->Fit(g7, "R+");
IhistEEM->Fit(g8, "R+");
// GetParameters from each fit first
g0->GetParameters(&par[0]);
g1->GetParameters(&par[3]);
g2->GetParameters(&par[6]);
g3->GetParameters(&par[9]);
g4->GetParameters(&par[12]);
g5->GetParameters(&par[15]);
g6->GetParameters(&par[18]);
g7->GetParameters(&par[21]);
g8->GetParameters(&par[24]);
//set parms as parms of Fit Fxn
fitFcn->SetParameters(par);
// Now Do the Final Fit to see How it looks on the Histogram
IhistEEM->Fit(fitFcn, "R+");
std::cout << "Printing Fit Parameters For EE- ...... " << std::endl;
fitFcn->GetParameters(par);
// Gets integral of function between fit limits
printf("Integral of function in EE- = %g\n",fitFcn->Integral(-2,2));
IhistEEP->Fit(fitFcn, "R+"); // Try Fit on EE+
std::cout << "Printing Fit Parameters For EE- ...... " << std::endl;
fitFcn->GetParameters(par);
printf("Integral of function in EE+ = %g\n",fitFcn->Integral(-2,2));
//test Fit on EB
IhistEB->Fit(fitFcn, "R+"); // Try Fit on EE+
std::cout << "Printing Fit Parameters For EB ...... " << std::endl;
fitFcn->GetParameters(par);
printf("Integral of function in EB = %g\n",fitFcn->Integral(-2,2));
TCanvas *c1 = new TCanvas("c1_fit","Fit Canvas EE-",200,10,800,900);
c1->SetGridx();
c1->SetGridy();
c1->GetFrame()->SetFillColor(21);
c1->GetFrame()->SetBorderMode(-1);
c1->GetFrame()->SetBorderSize(5);
// c1->Divide(2,1);
c1->cd();
IhistEEM->Draw();
fitFcn->Draw("sames");
// draw the legend
TLegend *leg = new TLegend(0.5,0.55,0.78,0.65);
leg->SetTextFont(72);
leg->SetTextSize(0.04);
leg->AddEntry(IhistEEM,"EE- Data","lpe");
leg->AddEntry(fitFcn,"Global Fit","l");
leg->Draw();
TCanvas *c2 = new TCanvas("c2_fit","Fit Canvas EE+",200,10,800,900);
c2->SetGridx();
c2->SetGridy();
c2->GetFrame()->SetFillColor(21);
c2->GetFrame()->SetBorderMode(-1);
c2->GetFrame()->SetBorderSize(5);
c2->cd();
IhistEEP->Draw();
fitFcn->Draw("sames");
TLegend *leg1 = new TLegend(0.5,0.55,0.78,0.65);
leg1->SetTextFont(72);
leg1->SetTextSize(0.04);
leg1->AddEntry(IhistEEP,"EE+ Data","lpe");
leg1->AddEntry(fitFcn,"Global Fit","l");
leg1->Draw();
TCanvas *c3 = new TCanvas("EB_fit","Fit Canvas EB",200,10,800,900);
c3->SetGridx();
c3->SetGridy();
c3->GetFrame()->SetFillColor(21);
c3->GetFrame()->SetBorderMode(-1);
c3->GetFrame()->SetBorderSize(5);
c3->cd();
IhistEB->Draw();
fitFcn->Draw("sames");
TLegend *leg2 = new TLegend(0.5,0.55,0.78,0.65);
leg2->SetTextFont(72);
leg2->SetTextSize(0.04);
leg2->AddEntry(IhistEB,"EB Data","lpe");
leg2->AddEntry(fitFcn,"Global Fit","l");
leg2->Draw();
}