TChain Problem

[Pepe_Le_Pew]

Have a look at the skeleton analysis source code that you can generate for your “drzewo” by doing:
drzewo->MakeClass(“MyClass”);
and/or by:
drzewo->MakeSelector(“MySelector”);
For details, see:

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…