More function supports like fftfreq

[eweca-d]

Thank you for this great crate!
Do you have any plan to extend the functions like fftfreq and fftshift? It would be better to add more functions like what numpy.fft did. For example, the fftfreq can be helpful in the cases of drawing the frequency-amplitude curve. I have to write it everywhere if I need it right now. If it is approved, I can help to do it.

[ejmahler]

I've never heard of this. Do you have a link to a wikipedia article or some other resource I can check out?

[eweca-d]

I've never heard of this. Do you have a link to a wikipedia article or some other resource I can check out?

You can find the function in "https://numpy.org/doc/stable/reference/generated/numpy.fft.fftfreq.html" and its source Python code. It is very simply and just to generate the frequencies of "k/(N*T), k=0, 1, 2...N - 1" which is the sampled frequencies. It could be helpful to plot the frequency-amplitude figure.