[ROOT] difference between tree name and the name of tree object

From: tcli (tcli@ic.sunysb.edu)
Date: Tue Jul 29 2003 - 00:51:34 MEST


Dear root users,
     I know from a root user that tree name is different from the name
of tree object. One of the arguments in creating a TChain is the tree
name. I check the tree name of 2 root TTree file from the Tree Viewer. I
think the name written next to the small tree picture is the tree name.
However, when I put it in the argument as "TChain chain("tre")" for
creating a TChain object and later opened Tree Viewer (with
"chain.StartViewer()"), ROOT said "cannot file tree with name tre in
myfile.root". So I would like to know if the "tree name" that I found
from Tree Viewer is really the intended argument in "TChain
chain("..")". If no, how can I check it?
    Also, from the user guide, a TChain object is a list of root files
containing the same tree. Does this means the trees of those root files
to be chained must be of the same name? If yes, how can I chain root
files with trees of different names?

Thanks in advance,
Lesley



This archive was generated by hypermail 2b29 : Thu Jan 01 2004 - 17:50:14 MET