Hi Yannick,
What you request could be implemented. However, I believe that it is far
more efficient to use TTree::MakeClass where you have the fullpower of
C++
to compute operations on original variables. You can also fill more than
on histogram in the loop.
Rene Brun
Patois Yannick wrote:
>
> Hello,
>
> I can draw a ntuple, like :
>
> my_ntuple->Draw("var1:var2");
>
> I can use simple predefined functions :
>
> my_ntuple->Draw("sqrt(var1):var2");
>
> But if I want to define my own function, using many variables in the
> ntuple, I would say something like in paw one can do :
> nt/plot 1000.toto.f(5)
>
> Where toto.f can then use any of the ntuple varable to create it's return
> value, using the defined COMMONs.
>
> I tryed something like :
>
> Float_t xrms(Float_t *PMT)
> {
> return(*PMT);
> }
>
> void rms()
> {
> TF1 *xrms = new TF1("xrms",xrms,0,1000,1);
> Tournesol->Draw("xrms(QDCf1)");
> }
>
> But it did'nt worked at all. Of course it's still far from what I would
> like to have (a function with *every* ntuple vars for this event as
> input).
>
> Any clue ?
>
> Yannick
>
> _/ Yannick Patois \_________________ Address (home) __________________
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