Hi Vuko,
The Hist.Binning.nD.x variables were only introduced in version 3.02/07 !
I do not understand what you mean by a "binning too raw".
Could you tell me the min/max/binwidth of the produced histogram
and the values you were expecting instead ?
Rene Brun
Vuko Brigljevic wrote:
>
> Hi root friends,
>
> still the first steps of a new rooter...
>
> What I am trying to do: fill a 2D histogram
> (some variable vs time) from a tree, change the
> X-axis to represent time, and redraw:
>
> t1->Draw("temp:time >> temphist","");
> temphist->GetXaxis()->SetTimeDisplay(1);
> temphist->Draw();
>
> Problem:
> I am loosing completely the precision of the first
> plot (from the TTree::Draw()) in the histogram.
> The binning must be too raw and the binning and
> the entries must be drawn randomly
> second histogram is so raw that the structure
> of the plot completely disappears.
>
> What I tried:
> 1) I read in the root manual about the environment
> variables:
>
> Hist.Binning.2D.x: 500
> Hist.Binning.2D.y: 500
> Hist.Binning.2D.Prof: 10000
>
> I added these lines to my ~/.rootrc (the values
> are mine, not the default), and checked that
> they have been correctly read:
>
> root [0] gEnv->Print()
> Hist.Binning.2D.x: 500 [User]
> Hist.Binning.2D.y: 500 [User]
> Hist.Binning.2D.Prof: 10000 [User]
>
> Still I have the same problem
>
> 2) I tried to predefine the histogram with a
> higher binning:
> TH2F * temphist=new TH2F("h2", "test", 1500,
> initTime, endTime, 500, 10., 20.);
> t1->Draw("temp:time >> temphist","");
> temphist->GetXaxis()->SetTimeDisplay(1);
> temphist->Draw();
>
> but this time the plot from the 2nd Draw() is empty.
>
> Any idea?
>
> In case it matters, I am running Root Version 2.23,
> a bit old I know, but it's still the BABAR standard
>
> Thanks,
>
> Vuko
>
> ========================================================================
> Vuko Brigljevic | Mail : SLAC, Mail Stop 41
> Lawrence Livermore National Laboratory | P.O. Box 4349, Stanford
> Nuclear and Particle Physics Division | CA 94309, USA
> | SLAC-Office : B280- room 143
> Member of the BaBar Collaboration | Phone : +1-650-926 8512
> <vuko@slac.stanford.edu> <http://www.slac.stanford.edu/~vuko>
> ========================================================================
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