Hi Giuseppe, See example in $ROOTSYS/tutorials/graph.C http://root.cern.ch/root/html/examples/graph.C.html Rene Brun 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->GetXaxis()->SetTitle("Zv"); > mltplct_gr1->SetTitle("Moltiplicity versus primary vertex position\n"); > mltplct_gr1->Draw("ACP"); > > Best regards, Giuseppe Lo Re.
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