Hi,
The reason is that 'TOTAL' is a variable of your program. This is NOT
accessible by the tree or the branch object. Hence the problem which is
diagnotiqued by the error message:
Error in <TBranch::TBranch>: Illegal leaf:AA/AA[TOTAL]/F
We recommend that you do not use this style of branches (it has a few
pitfalls that are hard to over-come).
Instead we recomment using a class. This can be trivially done by written a
class definition and compiling it with ACLiC.
Cheers,
Philippe.
-----Original Message-----
From: owner-roottalk@pcroot.cern.ch
[mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of zaldy
Sent: Monday, July 14, 2003 12:04 PM
To: roottalk@pcroot.cern.ch
Subject: [ROOT] Array Arguments of tree->Branch(....)
Dear ROOTers,
I'd like to understand and learn how to create a tree with an array
branch. I read the Tutorial section (tree3.C).
But why does the ff. line produces a segmentation problem/error messages:
--------------------------------------------------------
........
int TOTAL = 2;
float AA[TOTAL];
TTree * tree = new TTree("tree","What a nice Tree");
tree->Branch("AA",AA,"AA[TOTAL]/F");
......
--------------------------------------------------------
Pls see URLs:
http://neutrino.kek.jp/~zaldy/root_work/MyRootFaq/Report_Branch_Array_Arg.tx
t
http://neutrino.kek.jp/~zaldy/root_work/MyRootFaq/test.cc
while:
---------------------------------------------------------
.........
float AA[2];
TTree * tree = new TTree("tree","What a nice Tree");
tree->Branch("AA",AA,"AA[2]/F");
--------------------------------------------------------
dont.
Am using ROOTV: 3.04/02
gcc 2.91.66
Thank you.
--------------------------------------------------------
Zaldy A. Nawang
PS Users Room 2
Yon Gokan,
E362, Neutrino Group,
IPNS, KEK,
Japan
e-mail: zaldy@neutrino.kek.jp
Tel. No. : (81) 029864 - 5387
--------------------------------------------------------
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