You can see an example of fitting function in the original function GraphFitChisquare of the class TGraph. Rene Brun Aihong Tang wrote: > > Hi, > > The documentation of TGraph::Fit says: > > option="U" Use a User specified fitting algorithm (via SetFCN) > > ============================= > By default the fitting function GraphFitChisquare is used. > To specify a User defined fitting function, specify option "U" and > call the following functions: > TVirtualFitter::Fitter(mygraph)->SetFCN(MyFittingFunction) > where MyFittingFunction is of type: > extern void MyFittingFunction(Int_t &npar, Double_t *gin, Double_t &f, > Double_t *u, Int_t flag); ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > ~~~~~~~~~~~~~~~~~~~~~~~~ > > But it is not clear to me, what does the arguments of MyFittingFunction > mean? How does it work? Is there an example showing how to customize > TGraph::Fitting? > > Thanks! > > Aihong
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