Hi, I have a function where the evaluation is expensive (i.e. time). Therefore for a given parameters I want to tabelize some values in the allowed range and extrapolate between the tabelized values. This I can do because the function is called much more often than the that the parameters change. I have derived a class from TF1 which has now a lookup table. I overloaded TF1::Eval() to look in the lookup table. the question: I have to make sure my lookup table is reset if parameters or range changes. I see there is a member TFormula::Update(). Can I savely assume this member is always called when a range or parameters changes takes place? (i.e. can I overload TF1::Update() to fill my lookup table) cheers, Rutger
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