I would like to do this
TChain *chainele = new TChain("my_tree_name");
chainele->Add("file1.root");
TFile * f = new TFile("file1.root","file1.root");
chainele->AddFriend("my_tree_name_2",f);
chainele->Add("file2.root");
f = new TFile("file2.root","file2.root");
chainele->AddFriend("my_tree_name_2",f);
But this doesn’t work. When I try to access a variable in the friend tree, it only works for file1.root.
Is there anyway to make a TChain which has friends?