hi Rene,
> As indicated by the error messages, your library with the classes Neutron,
> Tracks and Bunch is missing. Did you forget to load it ?
I don't forget to load the classes Neutron, Tracks and Bunch. I don't
know how to do this. Can you please explain how to do this?
My root version is 2.22/09.
Best Regards
Avi.
>
> With the new branch style introduced in 3.01, one should be able to copy/select
> a Tree without having the original classes.
>
> Rene Brun
>
>
> Avi Malki wrote:
> >
> >hi rooters,
> >
> >We would like to consider reducing the data and select events with some
> >criteria such as 3 tracks (in event branch) and one negative particle (in
> >tracks branch) for example.
> >
> >The program below create a new tree with number of tracks equal 3
> >for example. The problem is that only 'event' is created the other
> >Branches (they are under event branch): Neutron, Tracks and Bunch
> >are filled with zeros for all variables.
> >
> >Can someone please give us advise how to overcome this problem?
> >
> > Best regards
> > avi.
> >
> >{
> > gROOT->Reset();
> >
> > gSystem->Load("/usr/local/root/test/libEvent.so");
> >
> > TFile f("../DATA/tf8826.root");
> > TTree *T = (TTree*)f.Get("T");
> >
> > Event *event = new Event();
> >
> > T->SetBranchAddress("event",&event);
> >
> > TFile f2("New.root","recreate");
> > TTree *T2 = T->CopyTree("Ntrack==3");
> >
> > T2->Write();
> >}
> >
> >The problem:
> >
> >root [0]
> >Processing tree_copy.c...
> >Warning in <TBranchClones::Streamer>: Unknow class: Neutron. Cannot read BranchClones: fNeut
> >Warning in <TBranchClones::Streamer>: Unknow class: Bunch. Cannot read BranchClones: fBn
> >Warning in <TBranchClones::Streamer>: Unknow class: Neutron. Cannot read BranchClones: fNeut
> >Warning in <TBranchClones::Streamer>: Unknow class: Bunch. Cannot read BranchClones: fBn
> >root [1] .q
>
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