Dear Rooters,
I'm pretty sure this little problem has already been solved. I'm trying to merge
several ROOT trees (all having the same structure) residing in different files
into a single one and to write the resulting tree out. The simpliest procedure
I tried - to create a chain and to write it out using methods of TChain class
doesn't do the job - I can create a chain
TChain c1("/STNTUPLE/h1");
c1.Add("/data/run1/einclusive/root/iceflt_ccj951.root");
c1.Add("/data/run1/einclusive/root/iceflt_ccj952.root");
c1.Add("/data/run1/einclusive/root/iceflt_ccj953.root");
but I didn't find a way to either write the chain with all the events out -
TChain::Write doesn't seem to write out the events, or to copy contents
of a chain into a new tree - smth. along these lines
TFile output_file("output.root");
TTree* output_tree = c1.CloneTree();
output_file.Write();
I'd appreciate any help here and I also think that that having a method
TChain::CloneTree overloading TTree::CloneTree might be quite useful.
Happy New Year and thanks, Pasha
This archive was generated by hypermail 2b29 : Tue Jan 01 2002 - 17:50:33 MET