Help on Method/s to create Tree from multi-fold gamma-ray coincidence data

[Wile_E_Coyote]

In general, you could create as many ROOT files with histograms as you have ROOT files with trees and then “combine” your histograms using hadd (run hadd -? for help).

You can also use a TChain to analyse all your ROOT files with trees (and create a single ROOT file with histograms).

gen_MatGG.cxx (3.2 KB)

Note that the “his2D” histogram is filled two times with every pair of “Eclab” values. So, maybe after the loops you should execute his2D->Scale(0.5); or you could simply use his2D->Fill(x, y, 0.5); instead.

BTW. See also:

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…