Hi Philip,
Thank you.
The order of appearance matters.
mg->Draw("ap");
gPad->Update();
mg->GetXaxis()->SetTitle("ETC...");
It is working...
> Hi,
>
> Currently to access the axis for a TMultiGraph, you first need to draw it
> and make sure the drawing actually happened. i.e do
> mg->Draw("ap");
> gPad->Update();
>
> Cheers,
> Philippe
>
> -----Original Message-----
> From: owner-roottalk@pcroot.cern.ch
> [mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of zaldy
> Sent: Saturday, August 16, 2003 4:31 AM
> To: Stanislav Nesterov
> Cc: roottalk@pcroot.cern.ch
> Subject: Re: [ROOT] TMultiGraph ...
>
>
>
> Hi,
>
>
> Thanks for reminding. It was a clerical error while am typing it in
> roottalk.
>
> I re-submit again. I rechecked again my original code
> Am using the notation "->" not the "." notation.
> I used ROOT 3.05/05 gcc 3.3.3 Redhat 9.0
>
> ///////////////////////////////////////////////////////////
> > >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?
> ////////////////////////////////////////////////////////////////////
>
>
>
> >
> > You must be careful with '.' and '->' operators. After *mg = new ....
> > you can use only '->' notation to resolve object methods and variables,
> > 'cause 'mg' is the pointer, not the very object. So change mg. to mg->
> > everywhere.
> >
> > Best regards,
> >
> > Stanislav.
> >
> > zaldy wrote:
> >
> > >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
> --------------------------------------------------------
>
--
--------------------------------------------------------
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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