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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