Hi Thomas, The straight forward way is to call the TH1D constructor accepting an array of bin edges. Yes, I could implement one function TH1::SetBins(n,edges), but this would imply too many new functions to support all the combinations for 2-d and 3-D case (TH1, TH2, TH3, TProfile, TProfile2D, TH1K), making heavier an interface already too heavy. Rene Brun - Thomas Bretz wrote: > > Hi, > > I have an already existing instance of TH1D and want to set the binning > of it. Because there is no interface I descided to use TAxis directly, > but this fails. To workaround I can do the follwoing: > > TH1D *h = new TH1D; > > // some other code.... > > h->SetBins(100, 0, 1); // 100 bins (this number is the important one, so > that TH1D knows the correct number, 0 and one are dummy values. > h->GetXaxis()->Set(100, edges); //edges is an array of 101 entreis > containing the edges of my bins.... > > Some idea? Can you implement a more straight forward function for this? > > Thanks, > Thomas.
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