RE: Independent branches in a TTree

From: Philippe Canal <pcanal_at_fnal.gov>
Date: Wed, 18 Jun 2008 07:46:49 -0500

Hi Julien,

> The TTree->Fill() function doesn't suit my needs since it will link
> the branches together via the entry number.

To create branches that are not linked via entry number you would create independent trees (with sets of branches that are linked by entry number) and connect the TTrees via TTree friendship and an index (that tells how the entries in each of the tree are connected) See TTree::AddFriend and TTree::BuildIndex.

Cheers,
Philippe.

-----Original Message-----
From: owner-roottalk_at_root.cern.ch [mailto:owner-roottalk_at_root.cern.ch] On Behalf Of Julien Piot
Sent: Wednesday, June 18, 2008 4:35 AM
To: roottalk_at_lxbuild091.cern.ch
Subject: [ROOT] Independent branches in a TTree

Dear ROOTers,

I have data from raw files that I want to store in TTrees via user made classes defining particles (Gammas, alphas, etc...). The events are not reconstructed yet, so I need as much independence as possible between the branches so I can go through branches in order to find coincidences.

The TTree->Fill() function doesn't suit my needs since it will link the branches together via the entry number.

Is there a possibility to do this with TTrees or do I need to look for another storage format ?

Thanks a lot.

Cordially,

Julien

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Julien Piot

IPHC/DRS
bat.27 bureau 216
23 rue du Loess
67037 Strasbourg

03.88.10.64.19

julien.piot_at_ires.in2p3.fr

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Received on Wed Jun 18 2008 - 14:46:56 CEST