Yes, this is a homework.
I've been told to perform Fourier transform on the following sequence of values:
a=[0 2 -1 3]
I think I'm supposed to use Discrete Fourier Transform and individually perform transform on each of the values. I've got this formula:
$ F(u) = \sum\limits_{x=0}^{M-1} f(x) e^{-j2{\pi}ux/M}, u = 0,1,..,M-1 $ $ f(x) = \frac 1 M\sum\limits_{u=0}^{M-1} F(u) e^{j2{\pi}ux/M}, x = 0,1,..,M-1 $
Okay, so what are all these variables? I guess that M would be 4 in my case? But what are j and u?
How am I supposed to use these formulas, as both formulas include the other, thus creating an infinite loop?