How can i Plot the amplitude spectrum

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Batuhan Samet Demirci
回答： Raghava S N 2025-4-8
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)

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Raghava S N
Raghava S N 2025-4-8
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.

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