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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