Merging two diffrent trees into one tree

[couet]

Problem merging trees

Dear all, I would like to merge TTrees from different files. The code snippet below works fine. In my actual script, however, I am looping over several hundred files. Therefore I would like to include a f->Close() statement. This, however, kills the TTree in the file and I get a SegFault when trying to merge the TTrees. In order to avoid this I added the tree->SetDirectory(0) statement. The script runs without any errors but the output TTree has very weird entries (they are basically all the …