I'm sorry, but I just don't believe you. When they showed you how to calculate a curve fit, what sort of tasks did they mention that might require an engineer to do such a thing? Give us some examples of instances in which an engineer would be required to perform a curve fit. And what specific fit types did they cover? I gave you a list once before and you seemed not to know what I was talking about. It looked like this: Arrhenius, Cauchy, Custom Function, Damped Oscillator, Exponential, Gaussian, Inverse, Linear, Lorentzian, Natural Log, Non-linear, Poisson, Power Law, etc, etc, etc.