[ROOT] problem with CopyAdresses()

From: Nicolas de Sereville (deserevi@csnsm.in2p3.fr)
Date: Thu Apr 25 2002 - 20:30:27 MEST 

Dear Rooters,

I have a TTree with 10 branches containing experimental datas. What I want
to do is to create another TTree with the same branches and perform a
selection within the data.

I tried to use the CopyAdresses() method, but I failed :

root [0] TFile f("~/nico/PH176/Analyse/fl18_cd2_coinc_#5.root")
root [1] TTree *old = (TTree*) f.Get("h900")
root [2] h900->Print()
******************************************************************************
*Tree    :h900      : Coinc
*
*Entries :    16335 : Total =          730540 bytes  File  Size =
469856 *
*        :          : Tree compression factor =   1.69
*
******************************************************************************
*Br    0 :strip_le  :
*
*Entries :    16335 : Total  Size=      63992 bytes  File Size  =
26187 *
*Baskets :        8 : Basket Size=       8000 bytes  Compression=   2.44
*
*............................................................................*
*Br    1 :Adc_leda  :
*
*Entries :    16335 : Total  Size=      63992 bytes  File Size  =
34334 *
*Baskets :        8 : Basket Size=       8000 bytes  Compression=   1.86
*
*............................................................................*
*Br    2 :strip_la  :
*
*Entries :    16335 : Total  Size=      63992 bytes  File Size  =
22936 *
*Baskets :        8 : Basket Size=       8000 bytes  Compression=   2.79
*
*............................................................................*
*Br    3 :Adc_lamp  :
*
*Entries :    16335 : Total  Size=      63992 bytes  File Size  =
35032 *
*Baskets :        8 : Basket Size=       8000 bytes  Compression=   1.83
*
*............................................................................*


...... more branches ...........



root [4] TTree *new = new TTree("new", "new")
root [5] new->CopyAddresses(old)
root [6] new->Print()
******************************************************************************
*Tree    :new       : new
*
*Entries :        0 : Total =               0 bytes  File  Size =
0 *
*        :          : Tree compression factor =   1.00
*
******************************************************************************


So I am not abble to see the branches for the new TTree.
Is it a normal behavior or did I miss something??

I read the 2 tutorials copytree.C but in my case I'm not interested in
copying the whole tree or only a few branches.

any hint is welcomed

thanks

Nicolas

P.S : I'm using root 3.02/03 on RH7.2
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