{
  const int n=20; // Arithmos simeiwn grafimatos
  double x[n], y[n]; // Pinakes dedomenwn
  for(int i=0; i<20; ++i){
    x[i]=i*0.1;
    y[i]=10*sin(x[i] +0.2);
  }
  TGraph  *gr = new TGraph(n,x,y); // Orismos toy grafimatos
  TCanvas *c1 = new TCanvas("c1", "Grafima", 700,400) ;
  c1->cd();
  gr->Draw("A*"); // Sxediasmos grafimatos
}