Hi Rene,
I agree with Yannick that for TH1 derived objects a memberfunction
GetNbins(), returning the total number of bins, would be very convenient.
This would prevent people from making the mistake of counting the
underflow and overflow bins as well.
Cheers,
Nick.
--
Dr. Nick van Eijndhoven mailto:nick@phys.uu.nl http://www.phys.uu.nl/~nick
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Rene Brun wrote:
>
> Hi Yannick,
>
> Misteries of inheritance ::)
>
> a TH1F, TH2F, etc all derive from TH1 and TArrayxx
> You can do
> Int_t ncells = h->GetSize()
> where Getsize will be TArray::GetSize
>
> For example, if you have a TH1F *h1 with 100 bins
> h1->GetSize() will return 102 (100 bins + Underflow + Overflow)
>
> Rene Brun
>
> Patois Yannick wrote:
> >
> > Hi,
> >
> > ROOT provide a mechanism to access each bins of an histo as a 1
> > dimension array whatever the histo dimension is.
> >
> > But surprisingly, there seems not to be any function that return the
> > total number of bins for an histo. I have GetNbinsX,Y and Z, but not a
> > 'GetBins' that would allow me to process the histo bins in a single loop
> > whatever the dimension is, eg:
> > int nbins=histo.GetNbins();
> > for (int i=1;i<nbins;i++)
> > histo.SetBinContent(sqrt(histo.GetBinContent(i));
> >
> > That could work easily for any histo, whatever dimension it has.
> >
> > Did I miss something ?
> >
> > Yannick
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