Hello, Rene,
Thank you for fast reply.
No, they are not named g..
I am calling this function in a loop,
so the name is always different.
I tryied to add:
g->SetName(g->GetName());
(does it make sence?)
it does not help...
regards,
Elena
On Fri, 17 Oct 2003, Rene Brun wrote:
> Hi Elena,
>
> It looks like your histograms TH1F *f and *g are not named "f" and "g".
> When doing t->Draw("p2.pt>>g"), ROOT will fill an histogram named "g".
> If no histogram named "g" exists, one will be automatically created.
>
>
> Rene Brun
>
> On
> Fri, 17 Oct 2003, Elena Vataga wrote:
>
> > Hello, rooters!
> >
> >
> > Could you, please, give me an advise on the following:
> >
> > I created function inside my root macro which essentialy
> > do the following:
> >
> > void make_histo(TChain *t , TH1F* g, TH1F* b, TCut CUT ) {
> > t->Draw("p2.pt>>g");
> > t->Draw("p2.pt>>b",CUT);
> > g->Sumw2();
> > b->Sumw2();
> > }
> >
> > Histogram I am getting on return are empty.
> > I cannot simply make:
> >
> > t->Draw("p2.pt>>htemp");
> > TH1F *g = (TH1F*)htemp->Clone("g")
> > because I am using non-equidistant binning and need to pass
> > booked histo into subroutine.
> >
> > Any idea how to make it work?
> >
> > Thank you in advance,
> > Elena
> >
>
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