ROOT::EnableImplicitMT(); // Tell ROOT you want to go parallel
ROOT::Experimental::TDataFrame d(“myTree”, file); // Interface to TTree and TChain
auto myHisto = d.Histo1D(“Branch_A”); // This happens in parallel!
myHisto->Draw();
When launching there are shown error that “No member named ‘TDataFrame’ in namespace ‘ROOT::Experimental’”. What’s the problem ?
ROOT::Experimental::TDataFrame was the old (experimental) name of ROOT::RDataFrame and and it has not been called like that in years. If you found that in official ROOT documentation please let us know, we should fix it.