Hi Annalisa,
This should work:
TFormula zmincut("zmincut", "100.");
TCut cut = "Xpos>zmincut";
ntuple->Draw("Iadc1", cut);
Steve
Annalisa De Caro wrote:
> Hi rooters,
> i discovered that this procedure does not work:
> TFile* file = new TFile("strip4_z2.root");
> TNtuple* ntuple=(TNtuple*)file->Get("h8;1");
> Float_t zmincut =100.;
> ntuple->Draw("Iadc1","Xpos>zmincut");
> ROOT talks: Error 26, Unknow name "zmincut".
>
> It works only in this other fashion:
> TFile* file = new TFile("strip4_z2.root");
> TNtuple* ntuple=(TNtuple*)file->Get("h8;1");
> ntuple->Draw("Iadc1","Xpos>100.");
> How can i introduce a cut where i want?
>
> And an other problem...
> When the command Draw (ntuple-Draw("Xpos"); or histogram->Draw();)is
> inside a macro, the histogram is plotted only when the macro is closed.
> And When the command Draw is inside a macro called by an other main macro,
> the histogram is plotted only when the main macro is closed. But how can i
> interact with the histogram (to draw a line where i want, for example), if
> i do not see him?
>
> Thank you
>
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