Hi Rene,
Sorry for the delay in my reaction, I had to turn to something
else urgently to finish Moriond results.
Rene Brun wrote:
>
> Hi Vuko,
>
> The Hist.Binning.nD.x variables were only introduced in version 3.02/07 !
Ah, ok. Well, I eventually realized that we got that version
installed at SLAC, even if the official BABAR software still
uses 2.*, but I can use 3.02/07 for my work so that solves
that problem :)
> 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 ?
Well, what I mean is that the histogram "temphist" coming out
of the lines:
t1->Draw("temp:time >> temphist","");
temphist->GetXaxis()->SetTimeDisplay(1);
temphist->Draw();
has very few bins, ~40, in each dimension, and that is not enough
for the plot I want to make. But since 2 pictures explain better
than 1000 words, here you see:
1) output of the t1->Draw():
http://www.slac.stanford.edu/~vuko/pictures/Tree-draw.gif
2) output of the temphist->Draw():
http://www.slac.stanford.edu/~vuko/pictures/TH2F-draw.gif
(WARNING for the archive: these links will probably removed after March
2002!)
BTW, I tried to call GetNBinsX() for the histogram and got
an error (see below), but that must just be my beginner ignorance
in basic ROOT concepts.
I repeat: version 3.02/07 solves my problem.
Thanks,
Vuko
root [1] temphist->GetNBinsX()
Error: Can't call TH2F::GetNBinsX() in current scope
FILE:/var/tmp/baaTUaOvf_cint LINE:1
Possible candidates are...
filename line:size busy function type and name (in TH2F)
filename line:size busy function type and name (in TH1F)
filename line:size busy function type and name (in TH1)
filename line:size busy function type and name (in TNamed)
filename line:size busy function type and name (in TObject)
filename line:size busy function type and name (in TAttLine)
filename line:size busy function type and name (in TAttFill)
filename line:size busy function type and name (in TAttMarker)
filename line:size busy function type and name (in TArrayF)
filename line:size busy function type and name (in TArray)
filename line:size busy function type and name (in TH2)
*** Interpreter error recovered ***
root [2]
========================================================================
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>
========================================================================
> 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>
> > ========================================================================
--
This archive was generated by hypermail 2b29 : Sat Jan 04 2003 - 23:50:44 MET