[ROOT] TMultiGraph ...

From: zaldy (zaldy@neutrino.kek.jp)
Date: Sat Aug 16 2003 - 01:42:16 MEST

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Hello,


Why is the ff. always givves a "illegal pointer" message?

   TMultiGraph * mg =  new TMultiGraph();
   TGraph * G[100];
   .....
   for (int i ....) {
     mg.Add(G[i]); 
   }
 
   mg.Draw("ap");  
   mg->GetXaxis()->SetTitle("TIiiii");
   gPad->Modified(); 
 


I wanted to put an X label as well as Y Label.

I tried, TAxis * axis = (TAxis *)mg->GetXaxis();
         axis->SetTitle("XTITLE"); 
   
But illegal pointer message again.

How ever, I can make this with TGraph.
Why? Isnt it true that TMultigraph is just related to TGraph?
Could this be a bug?


Thanks

I used ROOT 3.05/05 gcc 3.3.3 Redhat 9.0

-- 

--------------------------------------------------------
                   Zaldy A. Nawang 
                   PS Users Room 2
                   Yon Gokan, 
                   E362, Neutrino Group, 
                   IPNS, KEK, 
                   Japan 
                    
                   e-mail: zaldy@neutrino.kek.jp
                   Tel. No. : (81) 029864 - 5387
--------------------------------------------------------

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