Hello Pietro
I think that if you use gr->GetXaxis->SetLimits(0.2,0.4) will work, it worked
for me. :)
Pietro Govoni wrote:
> Dear rooters,
> I'm trying to draw Tgraph in a certain range, narrower than the
> definition's one.
> The code I'm using is a simple example:
>
> void TGraph_example()
> {
> Double_t x[5];
> Double_t y[5];
> for (Int_t i=0; i<5; i++) {x[i]=0.1*i;y[i]=10*sin(x[i]+0.2);}
> TGraph *gr = new TGraph (5,x,y);
> gr->GetXaxis()->SetRangeUser(0.2,0.4);
> gr->Draw("AC*");
> }
>
> When I use it as a sequence of prompt commands everything works properly,
> but if I try to let ROOT execute them as a macro I get this error:
>
> Processing TGraph_example.C...
> Error: illegal pointer to class object GetXaxis() 0x0 126
> FILE:TGraph_example.C LINE:9
> *** Interpreter error recovered ***
>
> This is my version of root:
>
> * Version 3.03/05 1 May 2002 *
>
> Is there anything that I forgot?
> Thank you for your attention, regards
>
> pietro
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