Basically, the question could be reformulated into the following. Why there is : virtual void SetParameters(Double_t p0,Double_t p1,Double_t p2=0,Double_t p3=0,Double_t p4=0 ,Double_t p5=0,Double_t p6=0,Double_t p7=0,Double_t p8=0,Double_t p9=0,Double_t p10=0); // *MENU* in the TFormula class (note that at least 2 parameters are required). Best regards, Jacek.
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