Re: [ROOT] Tspectrum:: Unfolding Routines.

From: Edmond Offermann (edmondoffermann@yahoo.com)
Date: Fri Jul 30 2004 - 17:07:17 MEST


Hi,

Just a warning (and probably stating the obvious) .

If people are going to use these routines to unfold a histogram
, say an electron scattering spectrum from which the radiative tail
is unfolded, and want to fit the spectrum afterwards, good luck !!!!

You started with a spectrum in which the bins were uncorrelated,
after the unfolding they are correlated and can not be handled
anymore by a standard fit as defined through TH1::Fit .

Eddy
--- Rene Brun <Rene.Brun@cern.ch> wrote:

> Jan,
> 
> Could you send the shortest possible running script showing what you
> try to do?
> I am ccying your mail to Miroslav Morhac the author of TSpectrum.
> 
> Rene Brun
> 
> Jan Conrad wrote:
> > 
> > Hi,
> > 
> >  I have a small macro where I convolute a Gaussian with a flat and
> try
> > to use the unfolding routines
> > Of TSpectrum.
> > 
> > Anyone who has expirience with:
> > 
> > const char *TSpectrum::Deconvolution1HighResolution(float *source,
> >                                                      const float
> *resp,
> >                                                      int size,
> >                                                      int
> > 
> > number_of_iterations,
> >                                                      int
> > 
> > number_of_repetitions,
> >                                                      double boost)
> > 
> > const char *TSpectrum::Deconvolution1Unfolding(float *source,
> >                                                const float **resp,
> >                                                int sizex, int
> sizey,
> >                                                int
> number_of_iterations)
> > 
> > and can send me a working example of how these functions are used ?
> > 
> > In my routine only Tspectrum::Dconvolution1 does anything to the
> > spectrum.
> > 
> > Thanks a lot in advance,
> > Jan
> 
> 



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