Re: 2-d scatter plots are solid black

Rene Brun (Rene.Brun@cern.ch)
Tue, 28 Jul 1998 12:11:12 +0200


Chris Jillings wrote:
>
> Hi,
> I have built a class (.h and .cpp below) which contains two
> TCutg objects and 4 TH2F objects. My cut class does two things: it takes
> the logical "and" of the two TCutg objects and histograms results. Four
> histograms are made: the passes and fails of each TCutg. The problem is
> that sometimes the 2-d hist scatter plot for the cut histograms is solid
> black. I dumped the histograms (one dump shown below) and in fact they are
> empty.
>
> Any ideas?

Chris,
Could you ssave the resulting scatter plot into a Root file
and send this file to me? I will investigate.

Rene Brun