Making a combined MakeClass for multiple root files

[Abhinab_Mukhopadhyay]

Hi ROOT users,

Let’s say I have a directory that contains multiple root files:

RootFile_1
RootFile_2
RootFile_3 …

Each Root file contains a TTree with the same name (let’s say LHEF) and with same branch name (example: Particle.Px) . How would I create a combined MakeClass for all the trees from each ROOT file? Is that even possible?

Thank you in advance!

[couet]

It looks like you are looking for TChain.

[Wile_E_Coyote]

Header files for Trees

“Most recent” documentation about how to generate and use an “analysis skeleton”: TTree::MakeClass (see also “ROOT User’s Guide” → “Trees” → “Using TTree::MakeClass”) TTree::MakeSelector (see also “ROOT Primer” → “File I/O and Parallel Analysis” → “N-tuples in ROOT” → “For the advanced user: Processing trees with a selector script” and “ROOT User’s Guide” → “Trees” → “Using TTree::MakeSelector” and “ROOT User’s Guide” → “Example Analysis”) TTree::MakeProxy ROOT::RDataFrame (uses the T…