Use option "hist".
See documentation of TH1::Draw, THistPainter::Paint
Rene Brun
On Sat, 14 Feb 2004,
David d'Enterria wrote:
> Hi ROOT team,
>
> I want to plot (for graphical purposes only) a histogram which has been
> filled manually and has null y-errors. The default drawing option for
> histos in this case produces a "blank" output in the canvas:
>
> TH1D* h = new TH1D("h","h",100,0,100);
> h->FillRandom("pol1",5000);
> h.Draw(); // no problem here the histo has non-null y-errors
> for (int i=0;i<h->GetNbinsX()+1;i++){h->SetBinError(i,0.);};
> h.Draw(); // the histo "disappears"
> h.Draw("h"); // OK the histo is back there ...
>
> Is this is a bug or a feature ? Why doesn't THistPainter::Paint
> <http://root.cern.ch/root/htmldoc/THistPainter.html#THistPainter:Paint>(Option_t
> *option) set the default (empty) draw option to "h" in this case ?
>
> Thanks.
>
> PS: Using root_v4.00.01.Linux.RH7.3.gcc296 binaries (same feature in
> root_v3.10.01.Linux.RH7.3.gcc296)
>
>
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