ROOT   Reference Guide
twoscales.C
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1/// \file
2/// \ingroup tutorial_hist
3/// \notebook
4/// Example of macro illustrating how to superimpose two histograms
5/// with different scales in the "same" pad.
6///
7/// \macro_image
8/// \macro_code
9///
10/// \author Rene Brun
11
12#include "TCanvas.h"
13#include "TStyle.h"
14#include "TH1.h"
15#include "TGaxis.h"
16#include "TRandom.h"
17
18void twoscales()
19{
20 TCanvas *c1 = new TCanvas("c1","hists with different scales",600,400);
21
22 //create/fill draw h1
24 TH1F *h1 = new TH1F("h1","my histogram",100,-3,3);
25 Int_t i;
26 for (i=0;i<10000;i++) h1->Fill(gRandom->Gaus(0,1));
27 h1->Draw();
28 c1->Update();
29
30 //create hint1 filled with the bins integral of h1
31 TH1F *hint1 = new TH1F("hint1","h1 bins integral",100,-3,3);
32 Float_t sum = 0;
33 for (i=1;i<=100;i++) {
34 sum += h1->GetBinContent(i);
35 hint1->SetBinContent(i,sum);
36 }
37
38 //scale hint1 to the pad coordinates
39 Float_t rightmax = 1.1*hint1->GetMaximum();
41 hint1->SetLineColor(kRed);
42 hint1->Scale(scale);
43 hint1->Draw("same");
44
45 //draw an axis on the right side
48 axis->SetLineColor(kRed);
49 axis->SetLabelColor(kRed);
50 axis->Draw();
51}
int Int_t
Definition: RtypesCore.h:45
const Bool_t kFALSE
Definition: RtypesCore.h:101
float Float_t
Definition: RtypesCore.h:57
@ kRed
Definition: Rtypes.h:66
R__EXTERN TRandom * gRandom
Definition: TRandom.h:62
R__EXTERN TStyle * gStyle
Definition: TStyle.h:414
virtual void SetLineColor(Color_t lcolor)
Set the line color.
Definition: TAttLine.h:40
The Canvas class.
Definition: TCanvas.h:23
The axis painter class.
Definition: TGaxis.h:23
void SetLabelColor(Int_t labelcolor)
Definition: TGaxis.h:107
1-D histogram with a float per channel (see TH1 documentation)}
Definition: TH1.h:577
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:8412
virtual Int_t Fill(Double_t x)
Increment bin with abscissa X by 1.
Definition: TH1.cxx:3338
void Draw(Option_t *option="") override
Draw this histogram with options.
Definition: TH1.cxx:3060
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:9089
virtual Double_t GetBinContent(Int_t bin) const
Return content of bin number bin.
Definition: TH1.cxx:5025
virtual void Scale(Double_t c1=1, Option_t *option="")
Multiply this histogram by a constant c1.
Definition: TH1.cxx:6586
virtual void Draw(Option_t *option="")
Default Draw method for all objects.
Definition: TObject.cxx:274
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
void SetOptStat(Int_t stat=1)
The type of information printed in the histogram statistics box can be selected via the parameter mod...
Definition: TStyle.cxx:1589
return c1
Definition: legend1.C:41
TH1F * h1
Definition: legend1.C:5
static uint64_t sum(uint64_t i)
Definition: Factory.cxx:2345