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multigraph.C
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1/// \file
2/// \ingroup tutorial_graphs
3/// \notebook
4/// Create and Draw a TMultiGraph.
5///
6/// \macro_image
7/// \macro_code
8///
9/// \author Rene Brun
10
11
12void multigraph()
13{
15 auto c1 = new TCanvas("c1","multigraph",700,500);
16 c1->SetGrid();
17
18 // draw a frame to define the range
19 auto mg = new TMultiGraph();
20
21 // create first graph
22 const Int_t n1 = 10;
23 Double_t px1[] = {-0.1, 0.05, 0.25, 0.35, 0.5, 0.61,0.7,0.85,0.89,0.95};
24 Double_t py1[] = {-1,2.9,5.6,7.4,9,9.6,8.7,6.3,4.5,1};
25 Double_t ex1[] = {.05,.1,.07,.07,.04,.05,.06,.07,.08,.05};
26 Double_t ey1[] = {.8,.7,.6,.5,.4,.4,.5,.6,.7,.8};
27 auto gr1 = new TGraphErrors(n1,px1,py1,ex1,ey1);
28 gr1->SetMarkerColor(kBlue);
29 gr1->SetMarkerStyle(21);
30 gr1->Fit("pol6","q");
31 mg->Add(gr1);
32
33 // create second graph
34 const Int_t n2 = 10;
35 Float_t x2[] = {-0.28, 0.005, 0.19, 0.29, 0.45, 0.56,0.65,0.80,0.90,1.01};
36 Float_t y2[] = {2.1,3.86,7,9,10,10.55,9.64,7.26,5.42,2};
37 Float_t ex2[] = {.04,.12,.08,.06,.05,.04,.07,.06,.08,.04};
38 Float_t ey2[] = {.6,.8,.7,.4,.3,.3,.4,.5,.6,.7};
39 auto gr2 = new TGraphErrors(n2,x2,y2,ex2,ey2);
40 gr2->SetMarkerColor(kRed);
41 gr2->SetMarkerStyle(20);
42 gr2->Fit("pol5","q");
43
44 mg->Add(gr2);
45
46 mg->Draw("ap");
47
48 //force drawing of canvas to generate the fit TPaveStats
49 c1->Update();
50 auto stats1 = (TPaveStats*)gr1->GetListOfFunctions()->FindObject("stats");
51 auto stats2 = (TPaveStats*)gr2->GetListOfFunctions()->FindObject("stats");
52 stats1->SetTextColor(kBlue);
53 stats2->SetTextColor(kRed);
54 stats1->SetX1NDC(0.12); stats1->SetX2NDC(0.32); stats1->SetY1NDC(0.75);
55 stats2->SetX1NDC(0.72); stats2->SetX2NDC(0.92); stats2->SetY1NDC(0.78);
56 c1->Modified();
57}
int Int_t
Definition: RtypesCore.h:45
float Float_t
Definition: RtypesCore.h:57
double Double_t
Definition: RtypesCore.h:59
@ kRed
Definition: Rtypes.h:66
@ kBlue
Definition: Rtypes.h:66
Option_t Option_t TPoint TPoint const char x2
Option_t Option_t TPoint TPoint const char y2
R__EXTERN TStyle * gStyle
Definition: TStyle.h:414
The Canvas class.
Definition: TCanvas.h:23
A TGraphErrors is a TGraph with error bars.
Definition: TGraphErrors.h:26
A TMultiGraph is a collection of TGraph (or derived) objects.
Definition: TMultiGraph.h:34
The histogram statistics painter class.
Definition: TPaveStats.h:18
void SetOptFit(Int_t fit=1)
The type of information about fit parameters printed in the histogram statistics box can be selected ...
Definition: TStyle.cxx:1542
return c1
Definition: legend1.C:41
static constexpr double mg