Re: [ROOT] nt/fill

From: Valeri Fine (Faine) (fine@bnl.gov)
Date: Thu Nov 23 2000 - 00:05:00 MET


> tree->Draw("x");
> tree->Draw("y","","same");
> 
> The y values will be off scale. I would like to be able to define
> a histogram
> 
> TH1F myhist("myhist","myhist",-3,13,16);
> 
> and then get the tree->Draw() command to fill myhist.

  Did you try

  tree->Draw("y>>myhist","","same");

> 
> Can I do this without resorting to tree->MakeClass(); ?
> 
> Cheers. Steve.
> 
> On Nov 22,  5:21pm, Valeri Fine (Faine) wrote:
> > Subject: Re: [ROOT] nt/fill
> >
> >
> > > What's the root equivlent to the nt/fill command?
> >
> >   There is the method:
> >
> >   TTree::Fill()
> >   see:  http://root.cern.ch/root/htmldoc/TTree.html#TTree:Fill
> >
> >   However I am not sure I did get your question.
> >   What did you call "nt/fill" ?
> >
> >   PAW says:
> >
> >  PAW > nt/fill
> >  *** Unknown command: nt/fill
> >  PAW >
> >
> > > Or, if I do a
> > > tree->Draw("x:y>>myplot");
> > >
> > > Is there a way of defining the axis of myplot?
> > >
> >
> >  "myplot" is your 2d histogram:
> > http://root.cern.ch/root/htmldoc/TH2.html
> >
> > The last os derived from
> > http://root.cern.ch/root/htmldoc/TH1.html
> > and inherits  TH1 properties as well.
> >
> > The method
> >
> > http://root.cern.ch/root/htmldoc/TH1.html#TH1:SetMaximum
> >
> > can be used to define z-scale with 2d hisrogram .
> > x and y scales are defined by "myplot" TH2F class constructor.
> >
> >
> > > Cheers. Steve.
> > >
> > >
> >-- End of excerpt from Valeri Fine (Faine)
> 
> 
> 



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