Hi Francois-Xavier,
Make a friend tree. (see docs on how to do that).
Yours,
____ | Christian Holm Christensen
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On Tue, 3 Sep 2002 16:19:32 +0200
GENTIT Francois-Xavier DAPNIA <GENTIT@dapnia.cea.fr> wrote
concerning "[ROOT] Adding one more element to a tree":
> Dear Rooters,
> What is the trick to add more elements to an already existing tree?
> To try to find it myself, I have taken the example "staff.C" in the
> tutorials. I have split cernstaff.dat into cernstaff1.dat and
> cernsatff2.dat, cernstaff1.dat being without the last element of
> cernstaff.dat, and cernstaff2.dat containing only this last element.
> I have then run "staff.C", obtaining correctly a tree of 3353 elements.
> Then I have run a script "staff2.C", which is identical with staff.C,
> except for these 3 lines:
>
> FILE *fp = fopen("cernstaff2.dat","r");
>
> TFile *f = new TFile("staff.root","UPDATE"); [instead of "RECREATE"]
> TTree *tree = (TTree *)f->Get("T"); [instead of new TTree]
>
> But instead of obtaining a tree with 3354 elements, I obtain 2 trees, the
> first T;1 one with 3353 elements, and a second one, T;2 with 1 element!!
>
> Thanks for your help
>
> François-Xavier Gentit
> DAPNIA/SPP CEA Saclay
> http://gentit.home.cern.ch/gentit/
>
>
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