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
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