RE: Getting rid of vertical error bars?

Hi Manuel,

When the histogram bin size is (much) smaller than a pixel, the drawing automatically turns, for speed reason, into "low resolution". To force to stay in "high resolution"(see TGraph help) you should use the option "9". So in your macro you should change the drawing option "HIST P0" to "HIST P9". Cheers, Olivier Couet

-----Original Message-----
From: Manuel Mussini [mailto:Manuel.Mussini_at_bo.infn.it] Sent: Friday, November 30, 2007 11:26 AM To: Olivier Couet; roottalk_at_lxbuild091.cern.ch Subject: RE: [ROOT] Getting rid of vertical error bars?

There should be problems with my mail server! I've sent it after few seconds!
Let's try again!

Bye...

> -----Original Message-----
> From: Olivier Couet [mailto:Olivier.Couet_at_cern.ch]
> Sent: Friday, November 30, 2007 10:52
> To: Manuel Mussini; roottalk_at_lxbuild091.cern.ch
> Subject: RE: [ROOT] Getting rid of vertical error bars?
>
> I do not see any attached .C file. Can you send it ?
> Thanks,
>
> Olivier Couet
>
> -----Original Message-----
> From: owner-roottalk_at_root.cern.ch [mailto:owner-roottalk_at_root.cern.ch]
> On Behalf Of Manuel Mussini
> Sent: Friday, November 30, 2007 10:48 AM
> To: roottalk_at_lxbuild091.cern.ch
> Subject: RE: [ROOT] Getting rid of vertical error bars?
>
> I agree with you!
> But something strage happens if I plot other histos with the "SAME"
> option (you
> can use the attached .C)!
> I'm using ROOT 5.17.02 on Windows!
> If I do this in a "big" TCanvas:
>
> inclusivePtK0sFoundsPerc40NewErr ->Draw("HIST P0");
> inclusivePtK0sFakesPerc40NewErr ->Draw("SAME HIST P0");
> inclusivePtK0sContaminatedPerc40NewErr->Draw("SAME HIST P0");
> inclusivePtK0sEffi40NewErr ->Draw("SAME HIST P0");
> inclusivePtK0sAcce40NewErr ->Draw("SAME HIST P0");
>
> it's fine!
> Now ... if I try to resize the Pad (let's say ... with the mouse I
> drag the Pad's low-right corner to the center of the canvas) histos
> are now drawn in a different way! If you try to zoom the X axis (e.g
> in my file from 0 to 2
> Gev/c)
> only the first histo in the list ("Founds") is drawn with "HIST P0"!
>
> How can I fix this?
>
> In addition to that ... when I save a TCanvas as a ".C" I always
> experience a problem with colors in TLegend! As you can see in my
> file, efficiency is drawn in cyan (which is correct) but in the legend

> it's green as the first entry!
>
> Bye...
>
> > -----Original Message-----
> > From: owner-roottalk_at_lxbuild091.cern.ch [mailto:owner-
> > roottalk_at_lxbuild091.cern.ch] On Behalf Of Rene Brun
> > Sent: Friday, November 30, 2007 09:23
> > To: Deepak Kar
> > Cc: roottalk_at_lxbuild091.cern.ch
> > Subject: Re: [ROOT] Getting rid of vertical error bars?
> >
> > Simply do
> > hist.Draw("hist p");
> >
> > Rene Brun
> >
> > Deepak Kar wrote:
> > > Hi,
> > >
> > > After dividing two histograms, I am ending up with huge vertical
> error
> > > bars in the resulting one, which although are right, for the
> > > purpose of my analysis, I just need the resulting points. So is
> > > there a way
> of
> > > getting rid of the vertical error bars altogether? (Or some trick
> > > to suppress them!) Like I can get rid of the horizontal ones by,
> > > gStyle->SetErrorX(d0)
> ;
> > > with d0=0;
> > >
> > > "Hist" option doesnt help me, since it draws the outline, whereas
> > > I just need the points.
> > >
> > > Thanks so much,
> > > Deepak
> > >
> > >
>
Received on Fri Nov 30 2007 - 14:30:32 CET