Hello,
From: "Philippe Canal" <pcanal@fnal.gov>
Date: Wed, 13 Aug 2003 17:15:27 -0500
>
> > root [13] t1.Draw("CBNT/h3780.aj_ncelllarem")
>
> Then default name of the friend is only the last part of the path. Try:
> t1.Draw("h3780.aj_ncelllarem")
I tried this way but I could not draw any plot as follows.
(A "tau.root" file is at /afs/cern.ch/user/j/jtanaka/public/tau.root.)
Is there any idea?
[lxplus076] ~/public > which root
/afs/cern.ch/sw/root/v3.05.07/rh73_gcc2952/root/bin/root
[lxplus076] ~/public > root -l
root [0] TChain t1("CBNT/h3780");
root [1] t1.Add("tau.root");
root [2] TChain t2("CBNT/h3781");
root [3] t2.Add("tau.root");
root [4] t1.AddFriend("CBNT/h3781");
root [5] t1.Draw("aj_ncelllarem");
<TCanvas::MakeDefCanvas>: created default TCanvas with name c1
root [6] t1.Draw("h3780.aj_ncelllarem");
*ERROR 26 :
Unknown name : "h3780.aj_ncelllarem"
root [7] t1.Draw("h3781.aj_ncelllarem");
*ERROR 26 :
Unknown name : "h3781.aj_ncelllarem"
Best Regards,
Junichi.Tanaka@cern.ch
> -----Original Message-----
> Sent: Tuesday, August 12, 2003 4:37 PM
> To: roottalk@pcroot.cern.ch
>
> Dear all,
>
> I have two questions about "AddFriend" of TChain.
> I'm using 3.05.05 and 3.05.07.
>
> In CBNT/h3780, there are two variables,
> Int_t aj_ncelllarem;
> Float_t aj_ce_etalarem[35000]; //[aj_ncelllarem]
> In CBNT/h3781, there are two variables,
> Int_t aj_ncelllarem;
> Float_t aj_ce_philarem[35000]; //[aj_ncelllarem]
> The root file, "tau.root", was converted from ntuple by using h2root.
>
> (1) I tried to turn on/off the status of all branches,
> even if the branches are added by "AddFriend".
> However I could get the status of branch "aj_ce_philarem"
> but I could not set the status of this branch.
> Is this correct? How should I do?
>
> root [0] TChain t1("CBNT/h3780");
> root [1] t1.Add("tau.root");
> root [2] TChain t2("CBNT/h3781");
> root [3] t2.Add("tau.root");
> root [4] t1.AddFriend("CBNT/h3781");
> root [5] t1.GetBranchStatus("aj_ce_etalarem")
> (const Bool_t)1
> root [6] t1.GetBranchStatus("aj_ce_philarem")
> (const Bool_t)1
> root [7] t1.SetBranchStatus("aj_ce_etalarem",0)
> root [8] t1.SetBranchStatus("aj_ce_philarem",0)
> Error in <TTree::SetBranchStatus>: unknown branch -> aj_ce_philarem
>
> (2) In the Users Guide, there is a statemate that
> we can access variables by "chainname.branchname.varname".
> But I could not do this in some cases. How should I do?
>
> root [9] t1.GetBranchStatus("CBNT/h3780.aj_ncelllarem")
> (const Bool_t)0
> root [10] t1.SetBranchStatus("CBNT/h3780.aj_ncelllarem",1)
> Error in <TTree::SetBranchStatus>: unknown branch ->
> CBNT/h3780.aj_ncelllarem
> root [11] t1.SetBranchStatus("aj_ncelllarem",1)
> root [12] t1.Draw("aj_ncelllarem")
> root [13] t1.Draw("CBNT/h3780.aj_ncelllarem")
>
> *ERROR 26 :
> Unknown name : "CBNT"
>
> Best Regards,
> Junichi.Tanaka@cern.ch
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