[ROOT] setting the split mode of a TParticle in a tree

From: Anne-Sylvie Nicollerat (Anne-Sylvie.Nicollerat@cern.ch)
Date: Fri Nov 22 2002 - 17:53:41 MET 

Hello,

I am trying to write a root tree containing TClonesArrays of TParticles.

It seems like I cannot set the split mode for the branch correctly.
When I try to plot for instance the energy distribution of the particles
in the array, I am getting an histogram with always the same value
(62.3). However when I read the tree with a macro and fill a histogram,
I get the correct distribution.

When I run the executable, I get the following error message:
Warning in <TTree::Bronch>: Using split mode on a class: TParticle with
a custom Streamer

Any idea ?
Thanks a lot

Anne-Sylvie


Here is the way I am defining the tree:

 TClonesArray* genphotons = new TClonesArray("TParticle");

 tree->Branch("genphotons",&genphotons,16000,10);

...................

  for(ParticleTree::const_iterator iloop=Genphotons.begin();
      iloop!=Genphotons.end();iloop++)
    { (....)
          (*genphotons)[genphotons->GetEntries()] = new
          TParticle((*iloop)->HepId(),(*iloop)->Status(),

first_mother,last_mother,first_daughter,last_daughter,

(*iloop)->px(),(*iloop)->py(),(*iloop)->pz(),(*iloop)->Energy(),

(*iloop)->x(),(*iloop)->y(),(*iloop)->z(),(*iloop)->t()
                   );
    }

    tree->Fill();


--
---------------------------------------------------------
Anne-Sylvie Nicollerat
Swiss Federal Insitute of technology (ETHZ)
Building 32, Office 3-C21, Phone +41 22 767 3585
CERN, CH-1211 Geneva 23
Switzerland

"Pour le croyant Dieu se trouve au début, pour le physicien au terme de
toute pensée." (Planck)

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