How can i Plot the amplitude spectrum

Hi. I have given to me a vector data file which is data.mat on matlab. And i know how to get fft of it. My question is how can i plot the amplitude spectrum centered at the zeroth frequency for this. The code i wrote is in below. What should i add to my code for plotting the amplitude spectrum centered at the zeroth frequency? My code; load data.mat X = fft(x)

[Batuhan Samet Demirci]

Data.mat

Answer 1

[Raghava S N]

Hi @Batuhan Samet Demirci,

This MATLAB Answer post gives a comprehensive solution to your query- https://www.mathworks.com/matlabcentral/answers/800831-amplitude-and-phase-spectrum. What you are essentially trying to plot is a double-sided amplitude spectrum. You can do this by passing the result of the "fft" function to the "fftshift" function. Refer to this link for more details about the "fftshift" function - https://www.mathworks.com/help/matlab/ref/fftshift.html.