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Reference Guide
graph.C File Reference

Detailed Description

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Draw a simple graph.

void graph() {
TCanvas *c1 = new TCanvas("c1","A Simple Graph Example",200,10,700,500);
c1->SetGrid();
const Int_t n = 20;
Double_t x[n], y[n];
for (Int_t i=0;i<n;i++) {
x[i] = i*0.1;
y[i] = 10*sin(x[i]+0.2);
printf(" i %i %f %f \n",i,x[i],y[i]);
}
TGraph *gr = new TGraph(n,x,y);
gr->SetTitle("a simple graph");
gr->GetXaxis()->SetTitle("X title");
gr->GetYaxis()->SetTitle("Y title");
gr->Draw("ACP");
// TCanvas::Update() draws the frame, after which one can change it
c1->Update();
c1->GetFrame()->SetBorderSize(12);
c1->Modified();
}
int Int_t
Definition: RtypesCore.h:45
double Double_t
Definition: RtypesCore.h:59
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 SetMarkerColor(Color_t mcolor=1)
Set the marker color.
Definition: TAttMarker.h:38
virtual void SetMarkerStyle(Style_t mstyle=1)
Set the marker style.
Definition: TAttMarker.h:40
The Canvas class.
Definition: TCanvas.h:23
A TGraph is an object made of two arrays X and Y with npoints each.
Definition: TGraph.h:41
void Draw(Option_t *chopt="") override
Draw this graph with its current attributes.
Definition: TGraph.cxx:808
TAxis * GetXaxis() const
Get x axis of the graph.
Definition: TGraph.cxx:1553
TAxis * GetYaxis() const
Get y axis of the graph.
Definition: TGraph.cxx:1563
void SetTitle(const char *title="") override
Change (i.e.
Definition: TGraph.cxx:2338
virtual void SetTitle(const char *title="")
Set the title of the TNamed.
Definition: TNamed.cxx:164
RVec< PromoteType< T > > sin(const RVec< T > &v)
Definition: RVec.hxx:1797
Double_t y[n]
Definition: legend1.C:17
return c1
Definition: legend1.C:41
Double_t x[n]
Definition: legend1.C:17
const Int_t n
Definition: legend1.C:16
TGraphErrors * gr
Definition: legend1.C:25
Definition: graph.py:1
Author
Rene Brun

Definition in file graph.C.