ForestErrAnal Lab7 Plot.C

void graph() {

 TCanvas *c1 = new TCanvas("c1","A Simple Graph Example",200,10,700,500);
 const Int_t n = 3;
 Double_t x[n], y[n];

 x[0]=1;
 y[0]=2;
 x[1]=2;
 y[1]=4;
 x[2]=6;
 y[2]=12;
 x[3]=10;
 y[3]=20;

 TGraph *gr = new TGraph(n,x,y);
 gr->Draw("ACL");

  c1->SetFillColor(42);
  c1->SetGrid();

  // TCanvas::Update() draws the frame, after which one can change it             
  c1->Update();
  c1->Modified();

}