When looping over a tree, the GValue in a ROOT file is loaded whether or not there was one passed on the command line. This makes it impossible to use a TTree::Scan() or TTree::Draw() command for values other than those already present in the root file.
When looping over a tree, the GValue in a ROOT file is loaded whether or not there was one passed on the command line. This makes it impossible to use a TTree::Scan() or TTree::Draw() command for values other than those already present in the root file.