Re: [ROOT] GetXaxis()->SetTitle().

From: Otto Schaile (Otto.Schaile@Physik.uni-muenchen.de)
Date: Mon Jan 08 2001 - 14:17:24 MET


Hi Giuseppe,
before invoking GetXaxis() you should Draw() the Graph:


On Mon, 8 Jan 2001 Giuseppe.LoRe@ct.infn.it wrote:

> 
> Hi, i have a little problem with TGraph.
> How can i put a title to an axis?
> I try with ...->GetXaxis()->SetTitle("..") but i obtain
> Error: illegal pointer to class object GetXaxis() 0x0 122.
> 
 TGraph *mltplct_gr1 = new TGraph(12, Zv, z1);
 mltplct_gr1->SetLineColor(2);
 mltplct_gr1->SetLineWidth(2);
 mltplct_gr1->SetMarkerColor(4);
 mltplct_gr1->SetMarkerStyle(21);
 mltplct_gr1->Draw("ACP");          //<<<<<<<<<<<<<<<
 mltplct_gr1->GetXaxis()->SetTitle("Zv");
 gPad->Modified(kTRUE);
 mltplct_gr1->SetTitle("Moltiplicity versus
primary vertex position\n");
> 
 Best regards,
 Otto 
> 

Dr. Otto Schaile            Sektion Physik, LMU Muenchen
Phone: +49 89 289 14070     Am Coulombwall 1, D-85748 Garching, Germany
GSM:   +49 171 4312031
FAX:   +49 89 289 14072     EMail: Otto.Schaile@Physik.Uni-Muenchen.DE



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