Re: ?: Draw("Z:Y:X>>h2")

Nick van Eijndhoven (>h2")">Nick@fys.ruu.nl)
Tue, 14 Apr 1998 13:35:48 +0200 (MET DST)

*** Dirk Meier wrote :
>
>
> Hi,
>
> supposed I have a splitted Tree with the float values X,Y,Z.
> Is it then possible to put these values into a 2 dimensional histogram
> with weight Z summing up in the bin at X,Y ?
> I can do this in a loop reading events from the tree and filling a
> histogram, but I would prefer it done in a command like
> Draw("Z:Y:X>>h2") . Is here a solution?
>
> Dirk
>
>
>
>
Hi Dirk,
I normally do

Draw("Y:X","1*Z")

which fills a (lego) 2D histo in which Z is used as the weight for the
X-Y cell.

Cheers,

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Dr. Nick van Eijndhoven Department of Subatomic Physics
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