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 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
