groups

name language licence
Make thumbnails for simpleviewer Shell Other
Maximum likelihood, minuit example C++ Other
Merging trees C++ Other
Monospace Shell Other
Objective-C Starter Objective-C Other
Open a file with a specific application Shell Other
PHP Starter PHP Other
Match any character except a new line Shell Other

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language: C++
licence: Other

Merging trees

options: view full snippet • send to code collector 
{

  TList tree_list;

  for ( Int_t i = 1 ; i < 7 ; ++i ) {

    TString f_name = Form("salt_ev_%d.root", i);
    TFile *f_in = new TFile(f_name);
    TTree *t = (TTree*)f_in->Get("ntp");
    tree_list.Add(t);

  }

  TFile *f_out = new TFile("salt_ev.root","recreate");
  TTree::MergeTrees(&tree_list);
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