Re: [ROOT] Scanning a ROOT file

From: Rene Brun (Rene.Brun@cern.ch)
Date: Thu May 29 2003 - 22:12:17 MEST


Hi Stelios,

TTree::Draw returns the number of entries passing the selection.
You can do:
 int nOK = myTree->Draw("i_id1:i_id2","i_id1!=-1 && i_id2!=-1 && 
i_id1==0","goff");

Rene Brun


On Thu, 29 
May 2003, Stilianos Kesisoglou wrote:

> Hi,
> 
>     Is there any way to scan a ROOT tree and count the entries that satisfy some user cuts?
> 
>     The command below scans the tree and prints the results 25 entries each time, but what I want
> is to avoid the printing and just go through all the entries without stopping every 25.
> 
>      myTree->Scan("i_id1:i_id2","i_id1!=-1 && i_id2!=-1 && i_id1==0");
> 
>     Is there any variation of this?
> 
>     Thanks!
> 
> Stelios.
> 



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