Hi Rene, I'm using a variable bin size histogram like you showed in your example. So I get the graphical output, as I like it. But if I try to fit this histogram with a gaussian the 'raw' data is fitted. But I want to fit the logarithmic data (3, 4, 5 not 1e3, 1e4, 1e5) The gaussian I get after calling TH1::Fit doesn't even look like a gaussian (for sure) when log scale is enabled. I would like to have both advantages. The advatage of a nice display of the x-axis and the advantage, that I can fit the logarithmic data instead of the raw data. Regards, Thomas. Rene Brun wrote: > > I have a histogram which is filled with some data. The get a more > > conviniet view of the x-axis I set the bins of the histogram so, that if > > I call gPad->SetLogx() I get equidistant bins. Now I want to fit this > > view with a gaussian, but TH1::Fit fits the original data instead of the > > logarithmic data. > > > > Is it possible to get either the nice view of a log-scaled X-Axis if i > > would use equidistant bins and fill the histogram with log(data) or is > > it possible to tell the fitter, that it should fit the logarithmic data > > instead of the 'real' data in the histogram?
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