doc/v634/NormalizeHistogram_8C.html

#include "TH2F.h"

#include "TRandom.h"

#include "TCanvas.h"


void NormalizeHistogram()

{


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

   TH1F *orig = new TH1F("orig", "Original histogram before normalization", binsx.size() - 1, &binsx[0]);


   gStyle->SetTitleFontSize(0.06);


   TRandom2 rand;


   // Filling histogram with random entries

   for (int i = 0; i < 100'000; ++i) {

      double r = rand.Rndm() * 100;

      orig->Fill(r);

   }


   TH1F *norm = (TH1F *)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();

}

TCanvas.h

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

TH2F.h

TRandom.h

gStyle
R__EXTERN TStyle * gStyle
Definition TStyle.h:436

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

TCanvas
The Canvas class.
Definition TCanvas.h:23

TH1F
1-D histogram with a float per channel (see TH1 documentation)
Definition TH1.h:622

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