Hi Bill, We have two examples at the URL: http://root.cern.ch/root/HowtoFit.html - a macro fitexample.C fitting a histogram - a general example with TMinuit fitting a set of points (not a histogram) In the tutorials section and also the Users Guide, we have many more examples showing how to fit histograms. The SetOptFit function in TStyle can be used to display the results of TH1::Fit or TGraph::Fit. If you fit yourself your histogram with a different algorithm, the resulting function and associated parameters is not saved with the histogram data structure and not visible when you activate the SetOptFit options. Rene Brun William Hanlon wrote: > > Hi Rene, > > I am using the the example "Fitting in general using the class > TMinuit" line for line (expect the function func which is my own > fitting algorithm) from http://root.cern.ch/root/HowtoFit.html. When I > plot the histogram though, no fit information is displayed. I have > used SetOptFit(1) and even used SetChiSquare(), SetParameter(), > SetParError(), but still the fit information is missing. > > >From what I gather, when a histogram is fitted a TF1 object is created > and associated with that histogram. But using the TMinuit method on > the web page you pointed me to, does not seem to do that. Am I missing > something? > > Bill > > >>>>> "Rene" == Rene Brun <Rene.Brun@cern.ch> writes: > > Rene> Hi Bill, > > Rene> See the chaper of Fitting in the Users Guide or also: > > Rene> http://root.cern.ch/root/HowtoFit.html > > Rene> Rene Brun > > -- > William Hanlon http://www.physics.rutgers.edu/~whanlon > Rutgers University pgp fingerprint:85 68 43 55 9A 83 44 00 > Dept. of Physics and Astronomy CE 19 C0 B0 D9 DE D6 52 > office: (732) 445-5032 pager: (732) 343-5783
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