I have a 4096 sequence of FFT coefficient. All of which a real values. My sampling frequency is also 4096 samples per seconds. Now I want to make a plot. I know my Y axis would be my FFT magnitude values, but what would my x- axis be. Would it be my sampling frequency, that is 1,2,3,4.........4096?
Here's a short snippet of code that returns the domain of the FFT depending on if you have the onesided or twosided FFT. This is from some code I posted on a somewhat related question here.
% Nfft - FFT size % Fs - Sampling frequency in Hz % oneside - flag indicating FFT results will be onesided or two sided % Compute the frequency vector if oneside == true f = fs * (0:Nfft/2).'./Nfft; else f = fs * (-Nfft/2:Nfft/2-1).'./Nfft; end