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Reference Guide
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 
12 TCanvas* multigraph()
13 {
14  gStyle->SetOptFit();
15  TCanvas *c1 = new TCanvas("c1","multigraph",700,500);
16  c1->SetGrid();
17 
18  // draw a frame to define the range
19  TMultiGraph *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  TGraphErrors *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  TGraphErrors *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  TPaveStats *stats1 = (TPaveStats*)gr1->GetListOfFunctions()->FindObject("stats");
51  TPaveStats *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  return c1;
58 }
virtual TFitResultPtr Fit(const char *formula, Option_t *option="", Option_t *goption="", Axis_t xmin=0, Axis_t xmax=0)
Fit this graph with function with name fname.
Definition: TGraph.cxx:1047
float Float_t
Definition: RtypesCore.h:53
virtual void SetX2NDC(Double_t x2)
Definition: TPave.h:80
return c1
Definition: legend1.C:41
Definition: Rtypes.h:61
R__EXTERN TStyle * gStyle
Definition: TStyle.h:418
A TMultiGraph is a collection of TGraph (or derived) objects.
Definition: TMultiGraph.h:37
TList * GetListOfFunctions() const
Definition: TGraph.h:127
int Int_t
Definition: RtypesCore.h:41
The histogram statistics painter class.
Definition: TPaveStats.h:20
virtual TObject * FindObject(const char *name) const
Find an object in this list using its name.
Definition: TList.cxx:497
static const double x2[5]
virtual void SetGrid(Int_t valuex=1, Int_t valuey=1)
Definition: TPad.h:318
virtual void SetMarkerColor(Color_t mcolor=1)
Set the marker color.
Definition: TAttMarker.h:43
virtual void Draw(Option_t *chopt="")
Draw this multigraph with its current attributes.
virtual void SetX1NDC(Double_t x1)
Definition: TPave.h:79
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:1209
virtual void SetMarkerStyle(Style_t mstyle=1)
Set the marker style.
Definition: TAttMarker.h:45
The Canvas class.
Definition: TCanvas.h:41
double Double_t
Definition: RtypesCore.h:55
A TGraphErrors is a TGraph with error bars.
Definition: TGraphErrors.h:28
virtual void SetTextColor(Color_t tcolor=1)
Set the text color.
Definition: TAttText.h:49
Definition: Rtypes.h:61
virtual void Add(TGraph *graph, Option_t *chopt="")
Add a new graph to the list of graphs.
virtual void Update()
Update canvas pad buffers.
Definition: TCanvas.cxx:2183
void Modified(Bool_t flag=1)
Definition: TPad.h:399
virtual void SetY1NDC(Double_t y1)
Definition: TPave.h:81