See an example in $ROOTSYS/tutorials/graph.C. In particular look at the comments: //Add axis titles. //A graph is drawn using the services of the TH1F histogram class. //The histogram is created by TGraph::Paint. //TGraph::Paint is called by TCanvas::Update. This function is called by default //when typing <CR> at the keyboard. In a macro, one must force TCanvas::Update. c1->Update(); c1->GetFrame()->SetFillColor(21); c1->GetFrame()->SetBorderSize(12); gr->GetHistogram()->SetXTitle("X title"); gr->GetHistogram()->SetYTitle("Y title"); c1->Modified(); Rene Brun On Tue, 29 May 2001, Chia Ming,Kuo wrote: > Dear all, > > I use root 2.25/02. > I can use histo1->GetXaxis()->SetTitle("X-Axis") in histogram. > But when I employ this to TGraphErrors (gr->GetXaxis()->SetTitle("X-Axis")), > I fail. There is a segmentation error message. > Why couldn't I use it in TGraphErrors ? > > Thanks for your help ! > > Sincerely, > Chia Ming >
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