Christopher Conner wrote: > > Is there a way to make "Slix" or "banx" or "proj" on 2D > histograms. I see that the Profile Class can handle this but I > see no constuctor that take a 2D histogram and a range in y and > fill the profile from the 2D histogram. > > I found a way to extract bin values from a 1D histogram > but I don't see how to do it for a 2D histogram. How is this done? > > It looks like 2D histograms inherit from 1D histograms but > then what is the bin number corresponding to binx=5 and biny=10? > We do not have a function making a projection of a 2-D histogram into a Profile histogram or a 1-D histogram. We are planning to add this functionality coupled with the dynamic projection using a slider. However, if you use a TNtuple/TTree, this functionality is already there. To extract bin values from a 2-D, use TH1::GetCellContent(Int_t binx, Int_t biny) Uou can also use: Int_t bin = TH1::GetBin(Int_t binx, Int_t biny, Int_t binz) The GetBin function returns a global bin number. Then you can use teh normal GetBinContent(bin). Rene Brun
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