Dear rooters, in the new version of root (3.03.09 on a Linux machine, Intel 2.0 Ghz double processor) using MakeSelector there is a new bool part of the .C file, essentially the Process part (see below). Sorry for my ignorance but what is the main difference with ProcessCut (it is not mentioned in the example in the Users Guide...)? Bool_t test2::Process(Int_t entry) { // Processing function. // Entry is the entry number in the current tree. // Read only the necessary branches to select entries. // To read complete event, call fChain->GetTree()->GetEntry(entry). // Return kFALSE as stop processing. } Bool_t test2::ProcessCut(Int_t entry) { // Selection function. // Entry is the entry number in the current tree. // Read only the necessary branches to select entries. // Return kFALSE as soon as a bad entry is detected. // To read complete event, call fChain->GetTree()->GetEntry(entry). return kTRUE; } Thanks Davide Grandi ********************************************************************** $ Davide Grandi % $ INFN Milano e-mail Davide.Grandi@mib.infn.it % $ P.zza delle Scienze 3 phone +39 02 6448 2306 % $ 20126 MILANO fax +39 02 6448 2367 % $ ITALY % $ % $ at CERN e-mail Davide.Grandi@cern.ch % $ CH-1211 Geneve CH phone +41 22 767 9403 % $ Bldg. 506 room R018 % $ or phone +41 22 767 7560 % $ Bldg. 576 room R002 % &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
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