Dear ROOT teams,
Would you please provided a new function in class of TFormula to get
the number of different variables occurs ?
We use ntuple format itself instead of ntuple-converted(via h2root) root
file as input for display. TTree allows user to impose cuts via TTreeFormula,
and I want to emulate the similar feature for ntuple while keeping the
advantage of reading only variables appeared in the cut expression. So I need
have a function to get the list of different variables appeared in the cut
expression. If I know fNval, I can write such function.
for (int i=0; i<fcut->GetNval(); i++) {
fcut->GetLeaf(i)->GetBranch()->GetName();
...
}
where fcut is an object of TTreeFormula which derives from TFormula.
In addition, I found that TApplication::StartIdleing() and StopIdleing()
do not work under interactive ROOT, I have not checked for batch mode. So I
have to use RemoveIdleTimer each time when I want to stop the IdleTimer, and
use SetIdleTimer to restart IdleTimer. I checked the corresponding source
code, it should work.
Best regards --Shuwei
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