RE: Error bar not displayed if bin content above histogram maximum

Hi,

In your example the bin content is outside of the range and therefore is not displayed.
I think it would be really confusing to see a line not attached to any data points.
You would not know where it is coming from. A piece of error bar without the data point visible has no real meaning. That's why it was done that way.

Cheers,

Olivier

-----Original Message-----
From: owner-roottalk_at_root.cern.ch [mailto:owner-roottalk_at_root.cern.ch] On Behalf Of Markus Cristinziani
Sent: Tuesday, April 07, 2009 4:28 PM
To: roottalk_at_root.cern.ch
Subject: [ROOT] Error bar not displayed if bin content above histogram maximum

Hello,

  I have a TH1D histogram with errors and I would like to SetMaximum to a value, lower than a certain bin content. Draw will then draw nothing, although one might prefer to draw the rest of the error bar. I wonder whether this is intentional (i.e. there are good examples where you don't want that), or the behavior of Draw could be modified. Thanks.

Markus

TH1 *h1= new TH1D("h1","h1",1,0.,1.);

h1->SetBinContent(1,5.);
h1->SetBinError(1,3.);
h1->Draw(); // bin content and error displayed correctly

h1->SetMaximum(4);
h1->Draw(); // could bin error be displayed ?

-- 
Markus Cristinziani
Physikalisches Institut, Uni Bonn
tel: +49(0)228-735762
http://mc-eng.physik.uni-bonn.de/