Curve fitting

Hello /prog/
I've been talking to Xarn about curve fitting and I wanted to know your opinions on this as well.
Is anyone here familiar with curve fitting?
http://bbs.readsicp.org/kareha.pl/1468337795/

>>8,9
I'm talking about the Fourier transform kind, and selective deconvolution is more for extrapolation from limited data, since you were asking about that sort of thing as well. Take a couple semesters of calc and then we can continue this conversation.