Re: [ROOT] Problem with TH1F::Divide

From: Rene Brun (brun@pcbrun.cern.ch)
Date: Sun Dec 19 2004 - 11:23:45 MET


Hi Roland,

CINT shortcuts are interesting when you type one command at the CINT 
prompt.
Do not use these shortcuts in a script. Use standard C++.

Rene Brun

On Sun, 19 Dec 
2004, Roland Kuhn wrote:

> Hi Rene!
> 
> On Dec 17, 2004, at 8:42 AM, Rene Brun wrote:
> 
> > Hi Dmitry,
> >
> > You see a side-effect of using teh CINT short-cut of a pointer
> > automatically created when giving the object name.
> > You should do, eg:
> >
> >     ff1=new
> > TFile("/home/botov/work/snd2k/R002-003/work/rootntuple/ 
> > eeElastic_10deg.$
> >     TH1F *h1 = (TH1F*)ff1->Get("h1");
> 
> I've seen "h1=h1" doing the same thing with much less typing. Is this  
> intentional/supported/recommended?
> 
> >     h1->Draw("Simth[0]>>htmp");
> >     TH1F *htmp = (TH1F*)ff1->Get("htmp");
> >     h1->Draw("Simth[0]>>htmp1","Simth[1]>20");
> >     TH1F *htmp1 = (TH1F*)ff1->Get("htmp1");
> >     htmp1->Divide(htmp);
> >     htmp1->Divide(htmp);
> >
> > Rene Brun
> 
> Ciao,
> 					Roland
> 
> --
> TU Muenchen, Physik-Department E18, James-Franck-Str. 85747 Garching
> Telefon 089/289-12592; Telefax 089/289-12570
> --
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> 



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