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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