Dear ROOT,
I have what seems to me like a simple problem...yet I cannot find any
information about it on the ROOT Web site. My apologies if I'm asking about
an already-solved problem.
I created a TChain that has seven different files as part of it, and I
used the MakeClass method to write a code skeleton for analysis. The Loop
method includes the lines
Int_t nentries = Int_t(fChain->GetEntries());
Int_t nbytes = 0, nb = 0;
for (Int_t jentry=0; jentry<nentries;jentry++) {
Int_t ientry = LoadTree(jentry); //in case of a TChain, ientry is the entry number in the current file
nb = fChain->GetEntry(jentry); nbytes += nb;
The comment line next to LoadTree seems quite true. fChain->GetEntries() does
seem to return the number of entries in the entire chain (all seven files),
yet LoadTree doesn't know what to do once jentry gets to be larger than the
number of entries in the first file in the chain. How can I get LoadTree to
point me to right entry number? How do we know what the "current file" is,
and how can we know the number of entries in that particular file? Thanks for
your help, best wishes.
Ken
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Ken Bloom, Karma Adjuster Department of Physics
734-763-2329 / 734-936-1817 (fax) University of Michigan
kenbloom@umich.edu http://www.umich.edu/~kenbloom
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