I have used fft(x) function in Matlab to perform Fast Fourier Transform on a given function and picture is the result. The graph you see is k, X(k). Now I am being asked to rescale frequency axis using Hz as a unit and plot the full range of positive frequencies from 0 to Fs (sampling frequency). Can someone please explain me how is k related to frequency? enter image description here

  • $\begingroup$ did you intend to have 65 data points? $\endgroup$ – user28715 Nov 6 '19 at 15:58

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