Append one tree to another

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1

Can I append one tree to another without copying the tree contents?

2

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!

3

No, it doesn’t help as my trees are in the same file, have different names but have the same structure.

4

You can add two trees from the same file, as per TChain::Add docs:

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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5

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