gerrors.C

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/// \file
/// \ingroup tutorial_graphs
/// \notebook -js
/// Draw a graph with error bars
///
/// \macro_image
/// \macro_code
///
/// \author Rene Brun
 
void gerrors()
{
   TCanvas *c1 = new TCanvas("c1", "A Simple Graph with error bars", 200, 10, 700, 500);
 
   c1->SetGrid();
   c1->GetFrame()->SetBorderSize(12);
 
   const Int_t n = 10;
   Float_t x[n] = {-0.22, 0.05, 0.25, 0.35, 0.5, 0.61, 0.7, 0.85, 0.89, 0.95};
   Float_t y[n] = {1, 2.9, 5.6, 7.4, 9, 9.6, 8.7, 6.3, 4.5, 1};
   Float_t ex[n] = {.05, .1, .07, .07, .04, .05, .06, .07, .08, .05};
   Float_t ey[n] = {.8, .7, .6, .5, .4, .4, .5, .6, .7, .8};
   TGraphErrors *gr = new TGraphErrors(n, x, y, ex, ey);
   gr->SetTitle("TGraphErrors Example");
   gr->SetMarkerColor(4);
   gr->SetMarkerStyle(21);
   gr->Draw("ALP");
 
   c1->Update();
}