Re: TH2 coz & empty bins

Hello Olivier,
thank you for you prompt answer. I see your point. Yet, the TProfile2D knows about the number of entries per bin. Maybe the option to show/hide them in the TProfile2D case should be left to the user.

Cheers,
-a

On Dec 10, 2009, at 4:42 PM, Olivier Couet wrote:

> Hi,
> Yes this is how the COL option is implemented. All details are here:
> http://root.cern.ch/root/html/THistPainter.html#HP14
> We end up to this solution after long discussions with users. It
> appeared it is the most reasonable one. The problem is that when you
> have an histogram with a negative minimum there is no way to know if a
> bin with contain 0 is really an empty which was never filled or if it is
> a bin filled several times and the sum of the weights end up being 0.
> Cheers,
> O.Couet
>
>
> -----Original Message-----
> From: owner-roottalk_at_root.cern.ch [mailto:owner-roottalk_at_root.cern.ch]
> On Behalf Of Alessandro Thea
> Sent: Thursday, December 10, 2009 4:33 PM
> To: roottalk (Mailing list discussing all aspects of the ROOT system.)
> Subject: [ROOT] TH2 coz & empty bins
>
> Hello rooters,
> We are having a problem dealing with a THProfile2D drawn with the "col"
> option.
> I fear this might have been already discussed in the past, forgive me if
> I'm reopening the discussion.
> The TProfile2D we use is filled incrementally and allows both positive
> and negative values. When displayed it is plotted in color ("COL").
> Now, the trouble is the THistPainter paints the empty bins if zmin < 0,
> doesn't paint them if otherwise.
>
> For us is important to distinguish between empty bins and bins which
> value is 0 or close to 0.
> Isn't there a way to force the empty bins to be hidden? I have found it
> for the lego plot ("0" option) but not for the other drawing modes.
>
> Thank you in advance for any help.
> Alessandro
>
> ________________________________________________________________________
> __
>
> ETH Zurich
> Dr. Alessandro Thea
> Institute for Particle Physics
>
> CERN, European Laboratory for Particle Physics,
> CH-1211, Geneve 23, Switzerland,
> PH/UCM, Office 32-2-B03, Mailbox: F17500
>
> Tel: +41-76-487-1800 E-Mail: Alessandro.Thea_at_cern.ch
> ________________________________________________________________________
> __
>

  ETH Zurich
  Dr. Alessandro Thea
  Institute for Particle Physics

  CERN, European Laboratory for Particle Physics,   CH-1211, Geneve 23, Switzerland,
  PH/UCM, Office 32-2-B03, Mailbox: F17500

  Tel: +41-76-487-1800 E-Mail: Alessandro.Thea_at_cern.ch