Dear RootTalk, I have a ntuple, called ntuple,with columns "run:noise" I make a TTreeFormula via TTreeFormula *h=new TTreeFormula("h","run<1000",ntuple) then when I go ntuple->Draw("run","h") I get *ERROR 26 : Unknown name : "h" when I try ntuple->Draw("run","h") I get Error: Can't call TNtuple::Draw() in current scope FILE:/tmp/fileH9aDTt_cint LINE:1 Clearly I am missing the point about TTreeFormula. Although this simple example could have been performed with a TCut, or even string, I would like to know how to use TTreeFormula in general, so when I have a complicated formula I can apply it to the ntuple as a cut. I tried to find an example, but could not. Could someone help me out. Thanks Nigel
This archive was generated by hypermail 2b29 : Tue Jan 04 2000 - 00:43:40 MET