Re: [ROOT] Project an histo using a certain bin definition

From: Georges Lobo (lobo@irmm.jrc.be)
Date: Mon Jul 09 2001 - 15:46:52 MEST


Maybe I can explain my problem a little bit. I have to divide 2 histograms
to compute a cross section. The problem is that the binnings are
differents (bins limits don't match). I was thinking about a simple
algorithm using only the bin width. Of course this method is valid with a
flat distribution but in my case I have a lot of bins and the variations
from bin to bin are quite small. But it is possible I think also that the
algorithm can do it in the right way using derivatives ? 


lobo@irmm.jrc.be

> Hi Georges,
> 
> Did you look in TH1::Rebin ? This function accepts only rebinning 2, 3, etc bins
> into one bin. Rebinning with a specified bin size is only possible if you can
> make some assumptions on the original histogram (flat distribution inside one
> bin). I never had requests for this mode so far.
> 
> Rene Brun
> 
> Georges Lobo wrote:
> > 
> > Hello all,
> > I was wondering if there was a macro ready-to-use to rebin an histogram
> > using a defined bin definition, which could imply to deal with frctions of
> > bins.
> > Thanks in advance
> >         Georges Lobo
> 



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