doc/hackathon/hist010__TH1__two__scales_8C.html

void hist010_TH1_two_scales()

{

   TCanvas *c1 = new TCanvas("c1", "hists with different scales", 600, 400);


   // create/fill draw h1

   gStyle->SetOptStat(kFALSE);

   TH1D *h1 = new TH1D("h1", "my histogram", 100, -3, 3);

   TRandom3 rng;

   for (int i = 0; i < 10000; i++)

      h1->Fill(rng.Gaus(0, 1));

   h1->Draw();

   c1->Update();


   // create hint1 filled with the bins integral of h1

   TH1D *hint1 = new TH1D("hint1", "h1 bins integral", 100, -3, 3);

   double sum = 0;

   for (int i = 1; i <= 100; i++) {

      sum += h1->GetBinContent(i);

      hint1->SetBinContent(i, sum);

   }


   // scale hint1 to the pad coordinates

   double rightmax = 1.1 * hint1->GetMaximum();

   double scale = gPad->GetUymax() / rightmax;

   hint1->SetLineColor(kRed);

   hint1->Scale(scale);

   hint1->Draw("same");


   // draw an axis on the right side

   TGaxis *axis =

      new TGaxis(gPad->GetUxmax(), gPad->GetUymin(), gPad->GetUxmax(), gPad->GetUymax(), 0, rightmax, 510, "+L");

   axis->SetLineColor(kRed);

   axis->SetLabelColor(kRed);

   axis->Draw();

}

kFALSE
constexpr Bool_t kFALSE
Definition RtypesCore.h:108

kRed
@ kRed
Definition Rtypes.h:67

gStyle
externTStyle * gStyle
Definition TStyle.h:442

gPad
#define gPad
Definition TVirtualPad.h:322

TAttLine::SetLineColor
virtual void SetLineColor(Color_t lcolor)
Set the line color.
Definition TAttLine.h:44

TCanvas
The Canvas class.
Definition TCanvas.h:23

TGaxis
Definition TGaxis.h:26

TGaxis::SetLabelColor
void SetLabelColor(Int_t labelcolor)
Definition TGaxis.h:106

TH1D
1-D histogram with a double per channel (see TH1 documentation)
Definition TH1.h:926

TH1::GetMaximum
virtual Double_t GetMaximum(Double_t maxval=FLT_MAX) const
Return maximum value smaller than maxval of bins in the range, unless the value has been overridden b...
Definition TH1.cxx:8682

TH1::Draw
void Draw(Option_t *option="") override
Draw this histogram with options.
Definition TH1.cxx:3097

TH1::SetBinContent
virtual void SetBinContent(Int_t bin, Double_t content)
Set bin content see convention for numbering bins in TH1::GetBin In case the bin number is greater th...
Definition TH1.cxx:9356

TH1::Scale
virtual void Scale(Double_t c1=1, Option_t *option="")
Multiply this histogram by a constant c1.
Definition TH1.cxx:6719

TObject::Draw
virtual void Draw(Option_t *option="")
Default Draw method for all objects.
Definition TObject.cxx:293

TRandom3
Random number generator class based on M.
Definition TRandom3.h:27

TRandom::Gaus
virtual Double_t Gaus(Double_t mean=0, Double_t sigma=1)
Samples a random number from the standard Normal (Gaussian) Distribution with the given mean and sigm...
Definition TRandom.cxx:274

c1
return c1
Definition legend1.C:41

h1
TH1F * h1
Definition legend1.C:5

hist010_TH1_two_scales
Definition hist010_TH1_two_scales.py:1

sum
static uint64_t sum(uint64_t i)
Definition Factory.cxx:2338