Hi Which root version you are using? Maybe this is the behavior of the root 4.00/04 for windows version I am using. Alex ---------------------------------------- Dr. Alexandre Suaide http://www.dfn.if.usp.br/~suaide/ 55-11-3091-7072 Departamento de Física Nuclear Universidade de São Paulo, Brasil ----- Original Message ----- From: "Olivier Couet" <couet@mail.cern.ch> To: <suaide@if.usp.br> Cc: <roottalk@pcroot.cern.ch> Sent: Monday, June 28, 2004 12:29 PM Subject: Re: [ROOT] autoscaling Y axis of an histogram > > Hi, > > Seems to me the zoom facility does exactly what you ask for. I have > executed your macro, then I did a zoom on the X axis and I get the attached > plot. As you see the Y axis doesn't start at 0. > > Cheers, O.Couet > > On Sun, 27 Jun 2004 suaide@if.usp.br wrote: > > > Here it is > > > > root 4.00/04 for windows > > > > h = new TH1F("h","h",100,0,10) > > for(int i=0;i<50000;i++) h->Fill(gRandom->Gaus(5,2); > > h->Draw() > > > > I zoom from 4.5 to 5.2 and I would expect that the Y > > axis would be zoomed to because the gaussian is > > almost flat in this region. Instead of that the Y axis keeps > > starting at 0 while I would like to have it starting somewhere > > around 800-850. > > > > Regards > > > > Alex Suaide > > > > > > > > ----- Original Message ----- > > From: "Rene Brun" <brun@pcbrun.cern.ch> > > To: <suaide@dfn.if.usp.br> > > Cc: <suaide@if.usp.br>; <roottalk@pcroot.cern.ch> > > Sent: Sunday, June 27, 2004 3:52 AM > > Subject: Re: [ROOT] autoscaling Y axis of an histogram > > > > > > > Could you send an example histogram where the autoscaling does not work? > > > Indicate between which bins you are zooming. > > > Also indicate the ROOT version > > > number. > > > > > > Rene Brun > > > > > > On > > > Sat, 26 Jun 2004 suaide@dfn.if.usp.br wrote: > > > > > > > Yes the autoscaling is indeed true but I would like > > > > to set the Y scale with limits corresponding to the > > > > minimum and maximum bin content of that region. > > > > The histogram autoscales but it usually takes the > > > > lower limit for the y axis as zero. This is what I > > > > want to avoid. > > > > > > > > Regards > > > > > > > > Alex > > > > > > > > On Sat, 26 Jun 2004, Rene Brun wrote: > > > > > > > > > I am not sure to understand your request. > > > > > This should be the default behaviour . > > > > > > > > > > Rene Brun > > > > > > > > > > On Sat, 26 Jun 2004 > > > > > suaide@if.usp.br wrote: > > > > > > > > > > > Hello all > > > > > > > > > > > > Is it possible to define some property in the > > > > > > histogram, or axis, or somewhere else that > > > > > > enables a kind of autoscaling? I mean, for > > > > > > instance, I have one histogram that the X > > > > > > axis goes from 0 to 10 and, when I zoom > > > > > > it with the mouse from 3.5 to 5.6 it picks > > > > > > the minimum and maximum value in that > > > > > > range for the Y axis and change the limits > > > > > > in the Y axis scale to expand the histogram > > > > > > in that region. Is it possible? > > > > > > > > > > > > Regards > > > > > > > > > > > > Alex Suaide > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > Org: CERN - European Laboratory for Particle Physics. > Mail: 1211 Geneve 23 - Switzerland Mailbox: J25910 > E-Mail: Olivier.Couet@cern.ch Phone: +41 22 7676522 > WWW: http://cern.ch/Olivier.Couet/ Fax: +41 22 7677155
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