Re: Histogram splitting and TSpectrum::Background

Ops sorry... i really forgot it....

Regards,
Marco

On 6/25/06, Rene Brun <Rene.Brun_at_cern.ch> wrote:
> You forgot the attachement.
>
> Anyhow, TSpectrum::Background evaluates the background only the defined
> range
> of the input histogram. Simply do
> h->GetXaxis()->SetRange(binmin,binmax);
> TSpectrum s;
> TH1 *hback = s.Background(h);
>
> Rene Brun
>
> Marco Calviani wrote:
> > Hi list,
> > i have an histogram as shown in the attached picture. I would like
> > to estimate the background of these signals using
> > TSpectrum::Background. As you can see from the image the background is
> > correctly estimated starting from channel ~47000 since the absence of
> > signals in the region between ~20000 and ~43000, and before ~17000 is
> > hindering the correct determination of the background where the signal
> > is present.
> > In order to correct for this phenomenon i would like to produce a code
> > where this kind of histogram is currently splitted into two different
> > histograms that containts only the bins which are different from -250.
> > Is it possible to perform this task using a predefined ROOT function
> > or do i have to do it by my own?
> > And secondly, it is correct that is not possible to tell
> > TSpectrum::Background to evaluate the background in specified zones
> > only?
> >
> > Sorry for the lenghty question,
> > Regards,
> > Marco
>
>