Hi Stanislav,
Sorry if I was not clear enough in my previous answer.
We do not intend supporting THbookFile/THbookTree in Root TChain.
Rene Brun
On Wed, 31 Jul 2002, Stanislav NESTEROV wrote:
>
> Hello Rene,
> Again I must remind you that in THbook* interface we have a
> problem that sometimes make this classes unusable or half-functional.
>
> Even if you try to read ANY value from the N-tuple you wouldn't
> succeed. Of course while you using only "Draw" functionality everythings
> seem to be OK.
> You can say that I must use ROOT-files instead, but for me it is not
> feasible.
>
> So please check THbook* for this malfunction. Thank you.
>
> Stanislav.
>
>
> On Fri, 26 Jul 2002, Stanislav NESTEROV wrote:
>
> > Hi Rene,
> > You are not completely right. This is the part of my N-tuple
> > root [5] tt2->Print()
> > ******************************************************************************
> > *Tree :h94 : /l3/l3data/99/ggntp/cc01jurg.ntp
> > *Entries : 78412 : Total = 1613614 bytes File Size = 0 *
> > * : : Tree compression factor = 1.00
> > ******************************************************************************
> > *Br 32 :Itrg2 : Itrg2/I
> > *Entries : 78412 : Total Size= 12394 bytes File Size = 0 *
> > *Baskets : 0 : Basket Size= 8000 bytes Compression= 1.00
> > *............................................................................*
> > *Br 33 :Itrg3 : Itrg3/I
> > *Entries : 78412 : Total Size= 12394 bytes File Size = 0 *
> > *Baskets : 0 : Basket Size= 8000 bytes Compression= 1.00
> > *............................................................................*
> > *Br 34 :Ntrk : Ntrk/I
> > *Entries : 78412 : Total Size= 12388 bytes File Size = 0 *
> > *Baskets : 0 : Basket Size= 8000 bytes Compression= 1.00
> > *............................................................................*
> >
> > As you can see "Ntrk" variable is integer. And it is one.
> > I wrote to you that if I issue somthing like
> > tree->Draw("Ntrk","","goff")
> > then every branch reading is Ok.
> >
> > Best regards,
> > Stanislav.
> > On Fri, 26 Jul 2002, Rene Brun wrote:
> > >
> > > Hi Stanislas,
> > >
> > > It is likely that your branch "Ntrk" contains more variables than just
> > > an integer. In your case, you overwrite your program by reading
> > > the branch variables behind the variable "Int_t nt".
> > > If you have more variables, you should define a C struct or a class
> > > or use MakeClass such that all variables in the branch are read
> > > correctly into the struct.
> > >
> > > Rene Brun
> > >
> > >
> > > On Fri, 26 Jul 2002, Stanislav NESTEROV wrote:
> > >
> > > >
> > > > Hello Fons,
> > > >
> > > > Recently I've tried to read some N-tuples via
> > > > THbookFile+THbookTree+THbookBranch classes but it was not so easy.
> > > >
> > > > While I was using only "Draw" functionality all seem to be OK, but when
> > > > I've tried to do some readings of certain branches of N-tuple I've
> > > > got into a big trouble: I can not do this at ALL:
> > > >
> > > > So from the beginning:
> > > >
> > > >
> > > > __________________________________________________________________
> > > > Content of my N-tuple:
> > > >
> > > > ===> Directory : //lun10
> > > > 94 (N) Gamma Gamma Ntuple
> > > > 9001 (1) NTRK
> > > > 9002 (1) E?BGO!
> > > > 9003 (1) E?HCAL!
> > > > 9004 (1) E?BGO+HCAL!
> > > > 9011 (1) NTRK
> > > > 9012 (1) E?BGO!
> > > > 9013 (1) E?HCAL!
> > > > 9014 (1) E?BGO+HCAL!
> > > > 9015 (1) InTEC and OuterTEC TRG
> > > > 9099 (1) number of events.
> > > >
> > > > root [0] gSystem->Load("libHbook.so");
> > > > root [1] THbookFile f("/l3/l3data/99/ggntp/cc01jurg.ntp");
> > > > root [2] tt2=(THbookTree*)f.Get(94)
> > > > (class THbookTree*)0x86fca48
> > > > root [3] Int_t nt
> > > > root [4] tt2->SetBranchAddress("Ntrk",&nt)
> > > > root [5] bran = (THbookBranch*)tt2->GetBranch("Ntrk")
> > > > (class THbookBranch*)0x87b4468
> > > > root [6] bran->GetEntry(30) //!!!!!!!!!!!!!!!!
> > > > ***** ERROR in HNBUFF : Buffer structure not initialized. : ID= 94
> > > > ***** ERROR in HGNTF : Cannot find Ntuple buffer structure : ID= 94
> > > > (Int_t)0
> > > > ________________________________________________________________________
> > > >
> > > >
> > > > BUT if I Drawing exatly the same variable ( here "Ntrk") via
> > > >
> > > > tt2->Draw("Ntrk")
> > > >
> > > > before getting any entry from this branch then everything is allright.
> > > >
> > > > So I found in procedure THBookFile::InitLeaves(...) that in case
> > > > of empty `TreeFormula* ' argument this procedure just quits. Very strange
> > > > solution I think.
> > > >
> > > > In any case N-tuple initialization (for branches) is failed and one can
> > > > only obtain some result if call procedures that using
> > > > TTreePlayer::InitLoop with some related formula.
> > > >
> > > > May be the best solution is slightly change the
> > > > THbookTree::InitLeaves()? I really don't know. Or just throw out from
> > > > THbookFile::GetEntryBranch call of HGNTF subrouting (in such specific
> > > > cases)?
> > > >
> > > > Best regards
> > > > Stanislav.
> > > >
> > >
> > >
> >
> >
> >
>
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