Re: [ROOT] 2D Histogram. (fwd)

From: Avi Malki (malki@tauphy.tau.ac.il)
Date: Tue Jul 01 2003 - 16:01:37 MEST


 Hi John,

On Tue, 1 Jul 2003, Frankland John wrote:

> Hi Avi
>
> >
> > TH2F *Track_Banch=new TH2F("Track_Banch","Track Numbers vs. BanchNumbers - 5.9 GeV/c" , 1000 , 0 , 50 , 1000 , 0 , 20);
> >
> >
> Why do you need such precision (1000 bins) for integer numbers ?
> Surely "new TH2F("...","...",50,0,50,20,0,20)" or
> "...51,-0.5,50.5,21,-0.5,20.5)"
> would be more reasonable ?

 What i notice is that if you dont put large bins in two dimensional
histogram the point doesn't sit in the right position.

 this what i do in my program:

 TH2F *Track_Banch=new TH2F("Track_Banch","Track Numbers  vs. Banch Numbers - 5.9 GeV/c" , 1000 , 0 , 50 , 1000 , 0 , 20);

 Int_t banch_num ,  total_track_num ;

 Track_Banch->Fill(banch_num,total_track_num);


  Best regards
   Avi.

>
> >
> > I got this error:
> >
> > Warning in <TH2F::Fill(Axis_t, Stat_t)>: may not use this method
> >
> >
> But what was the TH2F::Fill command which provoked this error ?
> Can you send the(excerpt from the) script ?
> Cheers
> John
>
> --
> John D. Frankland
> Beam Coordinator
> GANIL
> B.P. 55027
> 14076 CAEN Cedex 05
>
> tel: +33 (0)231454628
> fax: +33 (0)231454665
>
>
>



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