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ratioplotOld.C
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1/// \file
2/// \ingroup tutorial_hist
3/// Example displaying two histograms and their ratio. This macro does not use the
4/// class TRatioPlot. For ROOT version >= 6.08 TRatioPlot should be used. See
5/// the other ratio plots examples in this folder.
6///
7/// \macro_image
8/// \macro_code
9///
10/// \author Olivier Couet
11
12void ratioplotOld( ) {
13 // Define two gaussian histograms. Note the X and Y title are defined
14 // at booking time using the convention "Hist_title ; X_title ; Y_title"
15 TH1F *h1 = new TH1F("h1", "Two gaussian plots and their ratio;x title; h1 and h2 gaussian histograms", 100, -5, 5);
16 TH1F *h2 = new TH1F("h2", "h2", 100, -5, 5);
17 h1->FillRandom("gaus");
18 h2->FillRandom("gaus");
19
20 // Define the Canvas
21 TCanvas *c = new TCanvas("c", "canvas", 800, 800);
22
23 // Upper plot will be in pad1
24 TPad *pad1 = new TPad("pad1", "pad1", 0, 0.3, 1, 1.0);
25 pad1->SetBottomMargin(0); // Upper and lower plot are joined
26 pad1->SetGridx(); // Vertical grid
27 pad1->Draw(); // Draw the upper pad: pad1
28 pad1->cd(); // pad1 becomes the current pad
29 h1->SetStats(0); // No statistics on upper plot
30 h1->Draw(); // Draw h1
31 h2->Draw("same"); // Draw h2 on top of h1
32
33#if ROOT_VERSION_CODE >= ROOT_VERSION(6,8,0)
34 // Avoid the first label (0) to be clipped.
35 TAxis *axis = h1->GetYaxis();
36 axis->ChangeLabel(1, -1, -1, -1, -1, -1, " ");
37 axis->SetLabelFont(43); // Absolute font size in pixel (precision 3)
38 axis->SetLabelSize(15);
39#else
40 // Do not draw the Y axis label on the upper plot and redraw a small
41 // axis instead, in order to avoid the first label (0) to be clipped.
42 h1->GetYaxis()->SetLabelSize(0.);
43 TGaxis *axis = new TGaxis( -5, 20, -5, 220, 20,220,510,"");
44 axis->SetLabelFont(43); // Absolute font size in pixel (precision 3)
45 axis->SetLabelSize(15);
46 axis->Draw();
47#endif
48
49 // lower plot will be in pad
50 c->cd(); // Go back to the main canvas before defining pad2
51 TPad *pad2 = new TPad("pad2", "pad2", 0, 0.05, 1, 0.3);
52 pad2->SetTopMargin(0);
53 pad2->SetBottomMargin(0.2);
54 pad2->SetGridx(); // vertical grid
55 pad2->Draw();
56 pad2->cd(); // pad2 becomes the current pad
57
58 // Define the ratio plot
59 TH1F *h3 = (TH1F*)h1->Clone("h3");
61 h3->SetMinimum(0.8); // Define Y ..
62 h3->SetMaximum(1.35); // .. range
63 h3->Sumw2();
64 h3->SetStats(0); // No statistics on lower plot
65 h3->Divide(h2);
66 h3->SetMarkerStyle(21);
67 h3->Draw("ep"); // Draw the ratio plot
68
69 // h1 settings
71 h1->SetLineWidth(2);
72
73 // Y axis h1 plot settings
74 h1->GetYaxis()->SetTitleSize(20);
75 h1->GetYaxis()->SetTitleFont(43);
76 h1->GetYaxis()->SetTitleOffset(1.55);
77
78 // h2 settings
79 h2->SetLineColor(kRed);
80 h2->SetLineWidth(2);
81
82 // Ratio plot (h3) settings
83 h3->SetTitle(""); // Remove the ratio title
84
85 // Y axis ratio plot settings
86 h3->GetYaxis()->SetTitle("ratio h1/h2 ");
87 h3->GetYaxis()->SetNdivisions(505);
88 h3->GetYaxis()->SetTitleSize(20);
89 h3->GetYaxis()->SetTitleFont(43);
90 h3->GetYaxis()->SetTitleOffset(1.55);
91 h3->GetYaxis()->SetLabelFont(43); // Absolute font size in pixel (precision 3)
92 h3->GetYaxis()->SetLabelSize(15);
93
94 // X axis ratio plot settings
95 h3->GetXaxis()->SetTitleSize(20);
96 h3->GetXaxis()->SetTitleFont(43);
97 h3->GetXaxis()->SetTitleOffset(1);
98 h3->GetXaxis()->SetLabelFont(43); // Absolute font size in pixel (precision 3)
99 h3->GetXaxis()->SetLabelSize(15);
100}
#define c(i)
Definition: RSha256.hxx:101
@ kRed
Definition: Rtypes.h:66
@ kBlack
Definition: Rtypes.h:65
@ kBlue
Definition: Rtypes.h:66
virtual void SetTitleOffset(Float_t offset=1)
Set distance between the axis and the axis title.
Definition: TAttAxis.cxx:301
virtual void SetLabelSize(Float_t size=0.04)
Set size of axis labels.
Definition: TAttAxis.cxx:206
virtual void SetTitleFont(Style_t font=62)
Set the title font.
Definition: TAttAxis.cxx:330
virtual void SetLabelFont(Style_t font=62)
Set labels' font.
Definition: TAttAxis.cxx:183
virtual void SetTitleSize(Float_t size=0.04)
Set size of axis title.
Definition: TAttAxis.cxx:312
virtual void SetNdivisions(Int_t n=510, Bool_t optim=kTRUE)
Set the number of divisions for this axis.
Definition: TAttAxis.cxx:236
virtual void SetLineWidth(Width_t lwidth)
Set the line width.
Definition: TAttLine.h:43
virtual void SetLineColor(Color_t lcolor)
Set the line color.
Definition: TAttLine.h:40
virtual void SetMarkerStyle(Style_t mstyle=1)
Set the marker style.
Definition: TAttMarker.h:40
virtual void SetBottomMargin(Float_t bottommargin)
Set Pad bottom margin in fraction of the pad height.
Definition: TAttPad.cxx:99
virtual void SetTopMargin(Float_t topmargin)
Set Pad top margin in fraction of the pad height.
Definition: TAttPad.cxx:129
Class to manage histogram axis.
Definition: TAxis.h:30
void ChangeLabel(Int_t labNum=0, Double_t labAngle=-1., Double_t labSize=-1., Int_t labAlign=-1, Int_t labColor=-1, Int_t labFont=-1, TString labText="")
Define new text attributes for the label number "labNum".
Definition: TAxis.cxx:906
The Canvas class.
Definition: TCanvas.h:23
The axis painter class.
Definition: TGaxis.h:23
void SetLabelFont(Int_t labelfont)
Definition: TGaxis.h:105
void SetLabelSize(Float_t labelsize)
Definition: TGaxis.h:107
1-D histogram with a float per channel (see TH1 documentation)}
Definition: TH1.h:574
void SetTitle(const char *title) override
See GetStatOverflows for more information.
Definition: TH1.cxx:6708
TAxis * GetXaxis()
Get the behaviour adopted by the object about the statoverflows. See EStatOverflows for more informat...
Definition: TH1.h:319
virtual void FillRandom(const char *fname, Int_t ntimes=5000, TRandom *rng=nullptr)
Fill histogram following distribution in function fname.
Definition: TH1.cxx:3523
virtual void SetMaximum(Double_t maximum=-1111)
Definition: TH1.h:397
TAxis * GetYaxis()
Definition: TH1.h:320
void Draw(Option_t *option="") override
Draw this histogram with options.
Definition: TH1.cxx:3070
virtual void SetMinimum(Double_t minimum=-1111)
Definition: TH1.h:398
TObject * Clone(const char *newname="") const override
Make a complete copy of the underlying object.
Definition: TH1.cxx:2737
virtual Bool_t Divide(TF1 *f1, Double_t c1=1)
Performs the operation: this = this/(c1*f1) if errors are defined (see TH1::Sumw2),...
Definition: TH1.cxx:2825
virtual void Sumw2(Bool_t flag=kTRUE)
Create structure to store sum of squares of weights.
Definition: TH1.cxx:8895
virtual void SetStats(Bool_t stats=kTRUE)
Set statistics option on/off.
Definition: TH1.cxx:8865
virtual void SetTitle(const char *title="")
Set the title of the TNamed.
Definition: TNamed.cxx:164
virtual void Draw(Option_t *option="")
Default Draw method for all objects.
Definition: TObject.cxx:197
The most important graphics class in the ROOT system.
Definition: TPad.h:26
void SetGridx(Int_t value=1) override
Definition: TPad.h:327
TVirtualPad * cd(Int_t subpadnumber=0) override
Set Current pad.
Definition: TPad.cxx:605
void Draw(Option_t *option="") override
Draw Pad in Current pad (re-parent pad if necessary).
Definition: TPad.cxx:1291
TH1F * h1
Definition: legend1.C:5