Hi Luis,
You have the bad luck of having a problem when all the root team members are
in a conference. Anyway, I just looked at your C/h files and they seems to
look as I would expect. In your case (using struct or variables instead of
classes) the resulting tree contains one branch for many variables. It is
expected that the SetBranch is called only once per branch (so much less
than the number of leaves in your cases).
One thing that might explain why you can not read the data using those files
is the size of the array. In some cases (like older version of HepTuple in
conjunction with user's code mis-coding) MakeClass could get confused with
the actual size of the array. Figuring out what the length should be
involves calling GetOffset on one leaf per branch and its successor (in the
same branch) and divide the difference by 4 (the size of ints and floats).
Alternatively you could call TLeaf::SetAddress for all the leaves in the
Notify method.
In addition, unless you used HepTuple or some other sofisticated code, it is
very possible that that the data is incorrect because your have the index of
the array on the same branch and use the same name in different branch.
Cheers,
Philippe.
-----Original Message-----
From: owner-roottalk@pcroot.cern.ch
[mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Luiz Martins Mundim
Filho
Sent: Thursday, March 27, 2003 8:13 PM
To: roottalk@pcroot.cern.ch
Subject: [ROOT] accessing several variables inside a branch.(more info)
I included in attachment the skeleton program generated by MakeClass. I
noticed that there are much less branch addresses set up than the number
of branchs/leaves (in case it has been split) that exist on the tree.
---------------------------------------------------------------------
I sent this message yesterday and got no reply. I checked the roottalk
rules and I do not think this messages is not in accordance with them,
so I'm posting it again, since I need urgente help because I need to get
some result till monday.
Thanks in advande for you help.
---------------------------------------------------------------------
Hello
I have a Tree with several branches and inside them, also several
leaves. This tree has not been written by me, but I have to analyse it.
I generated a skeleton code (using both MakeClass and
MakeSelector), but I could not access the data I want with the code root
gave me. I can draw the variable using tree->Draw("branch.var"), but when
trying to access them inside the skeleton program, it fails. I realized that
on the header file, the variables are defined like
branchname_var
(with an underscore), that means, it do not seem to be a structure like
object.
I tried several variation of statements and all of them failled.
Do I need to add more (accessing) code to be able to read the data, like
setting branch /leaf address? I mean, apart from the the code particular
to the my analysis? I guessed
that MakeClass and/or MakeSelector should write a skeleton ready to
access the data.
I took a look on the root pages and found nothing conclusive, since all
the instruction seems to be related to unamed macro. I also downloaded
the new
User Guide and it did not help me too.
Other information:
Root version: 3.05/03
OS : Linux Red Hat 8.0
In attachment it is a file describing the ntuple variables, since the
tree is too big and I cannot generated a smaller one. The important
branch for me is one starting with ELE (for eletrons) and ending with p_off:
p -> means physics information (d stands for debug information)
off -> off line processing.
Thank you.
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