Hi, This is a side effect of TF1::GetXaxis() that creates an intermediate histogram (fHistogram member) and sets the title of the histogram to the current title of the function (eg "pol4"). In Principle, one should implement a TF1::SetTitle that will set also the title of the histogram in addition to the title of the function. In your test2 function, replace: f2->SetTitle("Test Title"); by f2->GetHistogram()->SetTitle("Test Title"); Rene Brun Siguang Wang wrote: > > Dear Friends, > For the next two tests, the title of the plot is "Test Title" for > test1() while the "pol4" for the test2(). > The only difference of the two tests is: The order of two commands: > "SetTitle" and "GetYaxis()->SetTitle". > Is it a bug? > > Thanks > > Siguang WANG > P.S. > > test1() > { > TCanvas *c1=new TCanvas("c1","test1",800,600); > TF1 *f1=new TF1("f1","pol4"); > f1->SetParameters(1.0,2.5,8.0,-7.0,2.0); > f1->SetTitle("Test Title"); > f1->GetYaxis()->SetTitle("Y Axis"); > f1->Draw(); > } > test2() > { > TCanvas *c2=new TCanvas("c2","test2",800,600); > TF1 *f2=new TF1("f2","pol4"); > f2->SetParameters(1.0,2.5,8.0,-7.0,2.0); > f2->GetYaxis()->SetTitle("Y Axis"); > f2->SetTitle("Test Title"); > f2->Draw(); > } > > ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ > 1e/c1 HERMES/DESY > Notkestrass 85 > 22607 Hamburg, GERMANY > Tel: +49-40-89983983(o) > Mobile: 01759346290 > ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^ ^-^
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