gerrors2.C

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/// \file
/// \ingroup tutorial_graphs
/// \notebook -js
/// Draw two graphs with error bars
///
/// \macro_image
/// \macro_code
///
/// \author Rene Brun
 
void gerrors2()
{
   TCanvas *c1 = new TCanvas("c1", "gerrors2", 200, 10, 700, 500);
   c1->SetGrid();
 
   // draw a frame to define the range
   TH1F *hr = c1->DrawFrame(-0.4, 0, 1.2, 12);
   hr->SetXTitle("X title");
   hr->SetYTitle("Y title");
   c1->GetFrame()->SetBorderSize(12);
 
   // create first graph
   const Int_t n1 = 10;
   Double_t xval1[] = {-0.22, 0.05, 0.25, 0.35, 0.5, 0.61, 0.7, 0.85, 0.89, 0.95};
   Double_t yval1[] = {1, 2.9, 5.6, 7.4, 9, 9.6, 8.7, 6.3, 4.5, 1};
   Double_t ex1[] = {.05, .1, .07, .07, .04, .05, .06, .07, .08, .05};
   Double_t ey1[] = {.8, .7, .6, .5, .4, .4, .5, .6, .7, .8};
   TGraphErrors *gr1 = new TGraphErrors(n1, xval1, yval1, ex1, ey1);
   gr1->SetMarkerColor(kBlue);
   gr1->SetMarkerStyle(21);
   gr1->Draw("LP");
 
   // create second graph
   const Int_t n2 = 10;
   Float_t xval2[] = {-0.28, 0.005, 0.19, 0.29, 0.45, 0.56, 0.65, 0.80, 0.90, 1.01};
   Float_t yval2[] = {0.82, 3.86, 7, 9, 10, 10.55, 9.64, 7.26, 5.42, 2};
   Float_t ex2[] = {.04, .12, .08, .06, .05, .04, .07, .06, .08, .04};
   Float_t ey2[] = {.6, .8, .7, .4, .3, .3, .4, .5, .6, .7};
   TGraphErrors *gr2 = new TGraphErrors(n2, xval2, yval2, ex2, ey2);
   gr2->SetMarkerColor(kRed);
   gr2->SetMarkerStyle(20);
   gr2->Draw("LP");
}