Multiple root files addition in a single root file

[iamaanand]

How to add same histogram of multiple root files (let’s say 20 or more) in a single root file? Of course I have to use for loop but I am unable to proceed .

This is how I am able to read branches (here ‘Edep’ ) of my root file ‘test.root’ .

 char const* InputFileName = "test.root"; 

    TFile* Input_file = new TFile(InputFileName);

    TTree* Scoring_tree = (TTree*)Input_file->Get("Scoring");

    cout<<"No. of Entries: "<<Scoring_tree->GetEntries()<<endl;

    Double_t Edep_info;

    TBranch* Edep_Branch = Scoring_tree->GetBranch("Edep");

    Edep_Branch->SetAddress(&Edep_info);

[Wile_E_Coyote]

Analysis skeleton for a TChain

Hi again guys, sorry for my naive questions. I’m still trying to understand the logic of ROOT. Following my previous topic How to read array variable in a Tree , I create the .h and .C (and modify it) files but I cannot understand how to generalize this to more root file. I followed the indication provided me by one answer of @Wile_E_Coyote and I understood that I need to use TChain and I read on the Manual on how to use it. I understood it how to use but not the connection with the previous…

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…