doc/master/hist009__TH1__normalize_8C.html

void hist009_TH1_normalize()

{

   const std::array<double, 6> binsx{0, 5, 10, 20, 50, 100};

   TH1D *orig = new TH1D("orig", "Original histogram before normalization", binsx.size() - 1, binsx.data());


   gStyle->SetTitleFontSize(0.06);


   // Filling histogram with random entries

   TRandom2 rand;

   for (int i = 0; i < 100000; ++i) {

      double r = rand.Rndm() * 100;

      orig->Fill(r);

   }


   TH1D *norm = static_cast<TH1D *>(orig->Clone("norm"));

   norm->SetTitle("Normalized Histogram");


   // Normalizing the Histogram by scaling by 1 / the integral and taking width into account

   norm->Scale(1. / norm->Integral(), "width");


   // Drawing everything

   TCanvas *c1 = new TCanvas("c1", "Histogram Normalization", 700, 900);

   c1->Divide(1, 2);


   c1->cd(1);

   orig->Draw();

   c1->cd(2);

   norm->Draw();

}

TRangeDynCast
ROOT::Detail::TRangeCast< T, true > TRangeDynCast
TRangeDynCast is an adapter class that allows the typed iteration through a TCollection.
Definition TCollection.h:358

r
Option_t Option_t TPoint TPoint const char GetTextMagnitude GetFillStyle GetLineColor GetLineWidth GetMarkerStyle GetTextAlign GetTextColor GetTextSize void char Point_t Rectangle_t WindowAttributes_t Float_t r
Definition TGWin32VirtualXProxy.cxx:168

gStyle
R__EXTERN TStyle * gStyle
Definition TStyle.h:436

ROOT::Detail::TRangeCast
Definition TCollection.h:311

TCanvas
The Canvas class.
Definition TCanvas.h:23

TH1D
1-D histogram with a double per channel (see TH1 documentation)
Definition TH1.h:693

TRandom2
Random number generator class based on the maximally quidistributed combined Tausworthe generator by ...
Definition TRandom2.h:27

TStyle::SetTitleFontSize
void SetTitleFontSize(Float_t size=0)
Definition TStyle.h:407

c1
return c1
Definition legend1.C:41