// histograms filled and drawn in a loop
void hsum() {
//
// To see the output of this macro, click begin_html <a href="gif/hsum.gif" >here</a> end_html
// Simple example illustrating how to use the C++ interpreter
// to fill histograms in a loop and show the graphics results
//Author: Rene Brun
TCanvas *c1 = new TCanvas("c1","The HSUM example",200,10,600,400);
c1->SetGrid();
gBenchmark->Start("hsum");
// Create some histograms.
auto total = new TH1F("total","This is the total distribution",100,-4,4);
auto main = new TH1F("main","Main contributor",100,-4,4);
auto s1 = new TH1F("s1","This is the first signal",100,-4,4);
auto s2 = new TH1F("s2","This is the second signal",100,-4,4);
total->Sumw2(); // store the sum of squares of weights
total->SetMarkerStyle(21);
total->SetMarkerSize(0.7);
main->SetFillColor(16);
s1->SetFillColor(42);
s2->SetFillColor(46);
TSlider *slider = 0;
// Fill histograms randomly
gRandom->SetSeed();
const Int_t kUPDATE = 500;
Float_t xs1, xs2, xmain;
for ( Int_t i=0; i<10000; i++) {
xmain = gRandom->Gaus(-1,1.5);
xs1 = gRandom->Gaus(-0.5,0.5);
xs2 = gRandom->Landau(1,0.15);
main->Fill(xmain);
s1->Fill(xs1,0.3);
s2->Fill(xs2,0.2);
total->Fill(xmain);
total->Fill(xs1,0.3);
total->Fill(xs2,0.2);
if (i && (i%kUPDATE) == 0) {
if (i == kUPDATE) {
total->Draw("e1p");
main->Draw("same");
s1->Draw("same");
s2->Draw("same");
c1->Update();
slider = new TSlider("slider",
"test",4.2,0,4.6,total->GetMaximum(),38);
slider->SetFillColor(46);
}
if (slider) slider->SetRange(0,Float_t(i)/10000.);
c1->Modified();
c1->Update();
}
}
slider->SetRange(0,1);
total->Draw("sameaxis"); // to redraw axis hidden by the fill area
c1->Modified();
gBenchmark->Show("hsum");
}
TH1F *getH(TString name,int bins, float xmin, float xmax, int color = kBlue)
{
// histcounter++;
// TString name = "hist"+TString::Itoa(histcounter,10);
auto h = new TH1F(name,name,bins,xmin,xmax);
h->SetLineColor(color); h->SetMarkerColor(color); h->Sumw2();
return h;
}
void checkvertex(TString datafilename, TString mcfilename)
{
TFile *fmc = new TFile(mcfilename);
auto ntmc = (TTree *)fmc->Get("nt");
TFile *fdt = new TFile(datafilename);
auto ntdt = (TTree *)fdt->Get("nt");
auto vdt0 = new TH1F("vdt0","Data no weighting",30,-15,15); vdt0->Sumw2();
auto vmc0 = new TH1F("vmc0","MC no weighting",30,-15,15); vmc0->Sumw2();
ntdt->Project("vdt0","vz","weight*(jtpt2>120 && jtpt2>30)");
ntmc->Project("vmc0","vz","pthatweight*(jtpt2>120 && jtpt2>30 && pthatsample>30)");
vdt0->Scale(1/vdt0->Integral());
vmc0->Scale(1/vmc0->Integral());
plotylog = false;
Draw({vdt0,vmc0});
auto vdt = new TH1F("vdt","Data weighted",30,-15,15); vdt->Sumw2();
auto vmc = new TH1F("vmc","MC weighted",30,-15,15); vmc->Sumw2();
ntdt->Project("vdt","vz","weight*(jtpt2>120 && jtpt2>30)");
ntmc->Project("vmc","vz","weight*(jtpt2>120 && jtpt2>30 && pthatsample>30)");
vdt->Scale(1/vdt->Integral());
vmc->Scale(1/vmc->Integral());
SetMC({vmc, vmc0});
SetData({vdt,vdt0});
SetInc({vmc, vmc0});
fout->cd();
vdt->Write();
vmc->Write();
vdt0->Write();
vmc0->Write();
fmc->Close();
fdt->Close();
}
CH3D(const char *a,const char* b, int c, double d, double e, int f, double g, double h,int i, double j, double k,double *w):TH3D(a,b,c,d,e,f,g,h,i,j,k),weight(w){Sumw2();};
CH2D(const char *a,const char* b, int c, double d, double e, int f, double g, double h,double *w):TH2D(a,b,c,d,e,f,g,h),weight(w){Sumw2();};
CH1D(const char *a,const char* b, int c, double d, double e,double *w):TH1D(a,b,c,d,e),weight(w){Sumw2();};