Problems with filling a histogram from Tree File

[Wile_E_Coyote]

Your “photonbeam_E” branch is a variable length array of “Double_t” values (the actual length, “treeTagger” entry number specific, is given by the “nTagged” branch as an “Int_t” value), so it is not a simple “Double_t” variable.

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…