Dear ROOTers, I have seen that it is possible to fit a TGraphErrors object with a given TF1. My question is: does this fit take into account the errors which I pass to this object, or not? Maybe, must I specify something in order to accomplish this task? Another question: I saw in the class definition a method called virtual void LeastSquareLinearFit(Int_t n, Double_t& a0, Double_t& a1, Int_t& ifail, Int_t first, Int_t last) Does it fit (according to parameters names) to which of the following? 1) a0 + a1*x 2) a0*x + a1 What does 'ifail' mean? Thanks for all. -- Dr. Alberto Pulvirenti University of Catania Via S. Sofia, 64 I-95123 Catania Phone: +39-095-3785286
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