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Hi Mariusz, I cannot reproduce your problem. Please always report the version number that you are using! The following script works: { c1 = new TCanvas("c1","A Simple Graph Example",200,10,700,500); c1->DrawFrame(0,2,2.2,11); const Int_t n = 20; Double_t x[n], y[n]; for (Int_t i=0;i<n;i++) { x[i] = i*0.1+0.05; y[i] = 10*sin(x[i]+0.2); } gr = new TGraph(n,x,y); gr->SetMarkerStyle(21); gr->Draw("P"); c1->Update(); gr->GetHistogram()->GetXaxis()->SetTitle("layer No"); c1->Modified(); } You may also consider the following simpler solution. See the way to specify the global, x and y title. { c1 = new TCanvas("c1","A Simple Graph Example",200,10,700,500); const Int_t n = 20; Double_t x[n], y[n]; for (Int_t i=0;i<n;i++) { x[i] = i*0.1+0.05; y[i] = 10*sin(x[i]+0.2); } gr = new TGraph(n,x,y); gr->SetTitle("graph title;x title;y title"); gr->SetMarkerStyle(21); gr->Draw("AP"); } Rene Brun Mariusz Sapinski wrote: > > I got the following code (fragments): > > ------------------------- > 1 TGraph * gr1 = new TGraph(nlayer, layer, E05_10); > 2 > 3 TCanvas * c1 = new TCanvas("c1","c1",10,10,400,400); > 4 c1->DrawFrame(3.5,-32.8.,18,-32.2); > 5 > 6 gr1->Draw("P"); // or (AP) > 7 c1->Update(); > 8 gr1->GetHistogram()->GetXaxis()->SetTitle("layer No"); > 9 > 10 c1->Modified(); > ----------------- > > Now the problem is that if i do not comment 8th line, the graph > disappears just after being plotted. And anyway this line is not working > with P option only (in line 6). But if i put AP option then two scales are > plotted on Y axis (the one of graph and the one superimposed in line 4). > > How to do to have axis title, single scale on Y axis and a visible points > of the graph? > > -- > Mariusz

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