Re: [ROOT] Filling branches independently

From: Gines MARTINEZ (martinez@subatech.in2p3.fr)
Date: Wed Sep 17 2003 - 14:01:51 MEST


Rene,
What is written in page 216 of the Users Guide is what I have called option
test2().
This is not satisfactory since it only works if there is already an old branch
in the tree.
I naivelty thought that what is written there should also work for the first
branch in the tree.
This not the case so I will try to by pass the problem checking the branch
content in the tree.
Gines

Rene Brun wrote:
> 
> Gines,
> 
> See discussion at page 216 t "Adding a branch to an
> existing Tree"
> 
> Rene Brun
> 
> Gines MARTINEZ wrote:
> >
> > Rene,
> > Of course your option test4() solve the problem.
> > My macro test.C was a simplification.
> > The problem I have is that my analysis (alirooot MUON)
> > is splitted in two reconstructions : reconstruction A and reconstruction B.
> > Both reconstructions use the same tree.
> > I would like to perform reconstruction A+B or B+A or A only or B only.
> > Reconstruction means also reading form a file(s) and writing in a file(s).
> > In this frame your option test4() does not work, but option test3() should work.
> > I do not understand why i cannot fill only one branch in option test3()
> > I hope it is clearer now.
> > Thanks for your help, Gines
> >
> > Rene Brun wrote:
> > >
> > > Gines,
> > >
> > > Why to do things complicated when they can be simple? ::)
> > >
> > > void test4()
> > > {
> > >
> > >   TTree T("test","test",99);
> > >
> > >   TNamed * data1 = new TNamed("AAAA","AAAA");
> > >   TNamed * data2 = new TNamed("BBBB","BBBB");
> > >
> > >   T.Branch("A","TNamed",&data1,35000);
> > >   T.Branch("B","TNamed",&data2,35000);
> > >
> > >   T->Fill();
> > >
> > >   Int_t nentries = T.GetEntries();
> > >   printf(">>> nentries=%d \n",nentries);
> > >
> > >   TNamed * lire = 0;
> > >   TNamed * lire2 = 0;
> > >   T.SetBranchAddress("A",&lire);
> > >   T.SetBranchAddress("B",&lire2);
> > >   T.GetEvent(0);
> > >   lire->Print("");
> > >   lire2->Print("");
> > > }
> > >
> > > Rene Brun
> > >
> > > Gines MARTINEZ wrote:
> > > >
> > > > Hi,
> > > > ===
> > > > gcc -v
> > > > Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
> > > > gcc version 2.96 20000731 (Red Hat Linux 7.3 2.96-110)
> > > > root-config --version
> > > > 3.05/07
> > > > ===
> > > > I would like to create branches in a tree, subsequently.
> > > > Enclosed, you will find a macro with 3 function test1() test2() and test3().
> > > >
> > > > In test1, when a new branch is created, the TTree::Fill() method is used.
> > > > You realize that the first event contains AAAA in branch A and BBBB in branch B.
> > > > This is what we want, however, Tree T contains two entries and we would like to
> > > > have only one entry.
> > > >
> > > > In test2, the problem with the number of entries is solved, since when B branch
> > > > is created we only fill the branch B.
> > > > In this case the only problem is "B" should be fill always after branch A is
> > > > created and "A" should be there.
> > > >
> > > > In test3, I thought this would be the solution, when a branch is created it is
> > > > filled using TBranch::Fill().
> > > > However, I realize this is not working for the  branch "A".
> > > > I realize that the number of entries is 0.
> > > > I would like to know why option test3() is not working, since this is the option
> > > > I would implement in my code.
> > > >
> > > > Thanks in advance, Ginés
> > > >
> > > >   --------------------------------------------------------------------------------
> > > >              Name: test.C
> > > >    test.C    Type: Plain Text (text/plain)
> > > >          Encoding: 7bit
> >
> > --
> > http://www-subatech.in2p3.fr/~plasma/martinez/GinesMartinez.html

-- 
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