Can one take f(t) and transform to F(omega) in the frequency domain using fft(), and use the properties of the fft and find the derivative of f(t)? For example, f(t) <-> F(omega) => f(t)^n <-> (i*omega)^n * F(omega) Use this and get, f(t)^n = F^(-) [ (i*omega)^n * F(omega) ] to get the nth derivative of f(t)? Todd Remund