Jacek, OK, so your question was with SetParameters, not with the constructors. We have two functions SetParameters. We force two arguments with the function that you indicate to avoid possible ambiguities with the other prototype SetParameters(double*) (at least with several compilers). Rene Brun "Jacek M. Holeczek" wrote: > > 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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