//***############## main fitting Fxn ################ *****//
void FitPlotAndSave( char *Ifile ){
/** Plot Options***/
//gROOT->Reset();
// gROOT->Clear();
gROOT->SetStyle("Plain") ;
gROOT->SetBatch(kFALSE);
gStyle->SetOptTitle(1);
gStyle->SetOptStat(0);
gStyle->SetOptFit(1);
gStyle->SetStatX(.89);
gStyle->SetStatY(.89) ;
gStyle->SetStatBorderSize(0);
//gStyle->SetOptStat(1111111)
gStyle->SetCanvasColor(kWhite); // background is no longer mouse-dropping white
gStyle->SetPalette(1); // blue to red false color palette. Use 9 for b/w
gStyle->SetCanvasBorderMode(0); // turn off canvas borders
gStyle->SetPadBorderMode(0);
gStyle->SetPaintTextFormat("5.2f"); // What precision to put numbers if plotted with "TEXT"
// For publishing:
gStyle->SetLineWidth(2);
gStyle->SetTextSize(1.1);
gStyle->SetLabelSize(0.06,"xy");
gStyle->SetTitleSize(0.08,"xy");
gStyle->SetTitleOffset(1.2,"x");
gStyle->SetTitleOffset(1.0,"y");
gStyle->SetPadTopMargin(0.1);
gStyle->SetPadRightMargin(0.1);
gStyle->SetPadBottomMargin(0.16);
gStyle->SetPadLeftMargin(0.12);
TGaxis::SetMaxDigits(1); // Set Axis to be of the form 0.11 10^N
TFile *ifile = new TFile(Ifile);
TF1 *fitFcn = new TF1("fitFcn", mygaus, FitLowRange, FitHighRange, 3 );
fitFcn->SetNpx(500);
fitFcn->SetLineWidth(4);
fitFcn->SetLineStyle(5);
fitFcn->SetLineColor(kBlue);
cout <<" Calling Fitting Fxntion" << endl;
TH1F*h_Seed_TimeEBEB = (TH1F*)ifile->Get("EBEB/seed time");
if(h_Seed_TimeEBEB == 0){ std::cout <<"!! Histogram Does not exist!!" << std::endl; throw 1;}
h_Seed_TimeEBEB->SetTitle("Seed Time[ns]");
h_Seed_TimeEBEB->SetMarkerStyle(20);
h_Seed_TimeEBEB->SetMarkerSize(0.8);
h_Seed_TimeEBEB->SetStats(1);
h_Seed_TimeEBEB->SetTitleSize(0.08, "x");
h_Seed_TimeEBEB->SetTitleOffset(1.0, "x");
h_Seed_TimeEBEB->SetTitleSize(0.06, "y");
h_Seed_TimeEBEB->SetTitleOffset(0.95, "y");
h_Seed_TimeEBEB->SetYTitle("Number of Seeds/0.05ns");
h_Seed_TimeEBEB->SetXTitle("t_{seed}[ns]");
h_Seed_TimeEBEB->GetXaxis()->SetRangeUser(FitLowRange, FitHighRange);
/** Set parms as parms of Fit Fxn **/
fitFcn->SetParameters(500, h_Seed_TimeEBEB->GetMean(), h_Seed_TimeEBEB->GetRMS() );
fitFcn->SetParNames("CONST", "#mu(ns)", "#sigma(ns)");
h_Seed_TimeEBEB->Fit("fitFcn", "LL"); /**Fit with improved LL**/
std::cout << "Printing Fit Parameters for EBEB ...... " << std::endl;
printf("Integral of function in EBEB = %g\n", fitFcn->Integral( FitLowRange, FitHighRange));
//*** retrive fit results***//
int npar = fitFcn->GetNpar();
TVirtualFitter *fit = TVirtualFitter::GetFitter();
fit->PrintResults(2,0.);
TMatrixD *CovMatrix = new TMatrixD ( npar, npar, fit->GetCovarianceMatrix() );
CovMatrix->Print();
TCanvas *c1 = new TCanvas("c1","EB-EB",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();
h_Seed_TimeEBEB->Draw();
fitFcn->Draw("sames");
c1->SetLogy(0);
// draw the legend
TLegend *leg = new TLegend(0.15,0.72,0.3,0.85);
leg->SetTextFont(72);
leg->SetTextSize(0.04);
leg->AddEntry(h_Seed_TimeEBEB,"EB","lpe");
leg->AddEntry(fitFcn,"GAUS","l");
leg->Draw();
c1->SaveAs("Seed_Time_DoubleElectron_Run2012A-EB-EB.png");
}
