Re: [ROOT] How to know whether a histogram has ZERO entries?

From: Jyothsna Rani (jyothsna@fnal.gov)
Date: Mon Jul 15 2002 - 06:43:13 MEST


I would like to know whether I can get the entries for all the histograms
with only ONE command.

Let jet1, jet2 .....jet10 be 10 histograms.
Is it possible to get the entries for all of them with only one command,
viz, jet*->GetEntries() (using some wild card)???

Thanks,
Jyothsna

On Mon, 15 Jul 2002, Sebastien Greder wrote:

> Hello,
> 
> just simply do : 
> 
> histoname->GetEntries();
> See:
> http://root.cern.ch/root/html/TH1.html#TH1:GetEntries
> Same method name for TTree.
> 
> Cheers,
> seb.
> 
> On Sun, 14 Jul 2002, Jyothsna Rani wrote:
> 
> > 
> > Hi,
> > 
> > Is there simple way to know the number of entries of a histogram or a
> > variable in an ntuple?
> > 
> > Thanks,
> > Jyothsna
> > 
> > 
> 
> 
> 

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