Re: How to define the x and y axies label on TMultigraph

Hi,

I tried using the command that you gave but i got the error message when i ran my code. You can see a part of my code and the message error below :

TCanvas *c1 = new TCanvas("c1","Extracted Coefficients",200,10,800,350);

TGraphErrors *gr5 = new TGraphErrors(nSelected3,energy,a0_M3,0,era0_M3); gr5->SetMarkerColor(kBlue);
gr5->SetMarkerStyle(21);
TGraphErrors *gr6 = new TGraphErrors(nSelected8,energy,a0s_M3,0,era0s_M3); gr6->SetMarkerColor(kGreen);
gr6->SetMarkerStyle(21);

// draw multi graph
TMultiGraph *mg4 = new TMultiGraph();

mg4->Add(gr5);
mg4->Add(gr6);
mg4->GetXaxis()->SetTitle(" E_{#gamma} (GeV))";
mg4->GetYaxis()->SetTitle("Coefficients" );
mg4->SetMaximum(2);
mg4->SetMinimum(-2);
mg4->Draw("AP");

root [0] .x pargraph.C
Error: illegal pointer to class object GetXaxis() 0x0 470 pargraph.C:274: *** Interpreter error recovered ***

Cheers,
Parada Hutauruk

Olivier Couet wrote:
> Hi,
>
> To set the a multigraph axis titles do:
>
> Mg->GetXaxis()->SetTitle("x title");
> Mg->GetYaxis()->SetTitle("y title");
>
> Cheers,
> O.Couet
>
> -----Original Message-----
> From: owner-roottalk_at_root.cern.ch [mailto:owner-roottalk_at_root.cern.ch]
> On Behalf Of parada hutauruk
> Sent: Wednesday, February 11, 2009 6:35 PM
> To: roottalk_at_root.cern.ch; Lorenzo Moneta
> Subject: [ROOT] How to define the x and y axies label on TMultigraph
>
> Hi,
>
> Does anyone help me how to make x and y axis label on TMultigraph?
> or can anyone guide me to find it? i tried to look at on manual and
> reference guide on website, however i did not find it.
>
> Cheers,
> Parada Hutauruk
>
>
Received on Thu Feb 12 2009 - 12:54:00 CET