RE: [ROOT] meaning of ntuple->Draw("a","b")

From: Rene Brun (Rene.Brun@cern.ch)
Date: Fri Apr 05 2002 - 21:53:49 MEST


Philippe,

Your answer is not completly correct ::)
ntuple->Draw("a","b")
histograms "a" with a weight "b". This is not the same
as histogramming "a*b"

Rene Brun

On Fri, 5 Apr 2002, Philippe Canal wrote:

> Hi Ahmet,
> 
> The 2nd argument is actually a 'weight'. So
> 	ntuple->Draw("a","b") 
> plots "a*b" if b is non-zero.
> 
> Cheers,
> Philippe.
> 
> -----Original Message-----
> From: owner-roottalk@pcroot.cern.ch
> [mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Ahmet Sedat Ayan
> Sent: Friday, April 05, 2002 1:30 PM
> To: roottalk@pcroot.cern.ch
> Subject: [ROOT] meaning of ntuple->Draw("a","b")
> 
> 
> 
> 
> Hi Rooters,
> 
> What is meaning of the following if we have an ntuple with variables, a,
> b, c,.. etc ?  Can I take it as <<Draw "a" if b is non-zero>> ?
> 
> ntuple->Draw("a","b") 
> 
> cheers,
> ahmet
> 
> ***************
> 
> Ahmet Sedat Ayan		
> 
> Physics & Astronomy Dept.
> Van Allen Hall    
> University of Iowa
> Iowa City, IA, 52242
>   
> Voice      : (++ 1 319) 335-1941 (W) (GMT-6)      
> Occupation : Ph.D Candidate (But still dreamer!)	
> e-mail     : ayan@cms.physics.uiowa.edu
> web        : http://jazz.physics.uiowa.edu/~ayan
> 
> 
> 



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