Can I append one tree to another without copying the tree contents?
You might be looking for TChain:
TChain c("treename"); c.Add("file1.root"); c.Add("file2.root"); // use it as a TTree, it will loop over the trees in both files transparently
Hope this helps!
No, it doesn’t help as my trees are in the same file, have different names but have the same structure.
You can add two trees from the same file, as per
TChain c("treename"); c.Add("file.root/tree1"); c.Add("file.root/tree2"); // use `c` as you would use a TTree
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