Re: [ROOT] Cut Definition and Command Draw

From: Sidoti Antonio (sidoti@science.unitn.it)
Date: Wed Apr 04 2001 - 13:01:30 MEST 

On Wed, 4 Apr 2001, 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?
>

Hi Annalisa,
for you first question try with:
(...)
TFile* file = new TFile("strip4_z2.root");
TNtuple* ntuple=(TNtuple*)file->Get("h8;1");
TCut zmincut("Xpos>100.");
ntuple->Draw("Iadc1",zmincut);
(...)
//The last line can also be replaced by
TCut myplot("Iadc1");
ntuple->Draw(myplot,zmincut);

Hope this helps,
Cheers,
Antonio


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	     a n t o n i o   	      s i d o t i

	     e-mail	              sidoti@science.unitn.it
	                              sidoti@fnal.gov
	     www   		      http://higgs.tn.infn.it/~sidoti/
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