Hi Batuhan,
I understand that you have a FFT of vector and want to know the process of plotting the amplitude spectrum centered at the zeroth frequency.
To implement this, kindly refer to the following steps -
1. Obtain your signal in the time domain.
2. Compute the Fourier Transform of the signal using the "fft" function.
X = fft(x); % Assuming your signal is stored in a variable 'x'
3. Shift the zero frequency component to the center of the spectrum using "fftshift" function.
X = fftshift(X);
4. Compute the amplitude spectrum by taking the absolute value of the shifted spectrum.
amplitude_spectrum = abs(X);
5. Create a frequency vector that corresponds to the frequency components of the spectrum. Use the "linspace" function to create a linearly spaced frequency vector.
N = length(x);
fs = 1; % Assuming a sampling frequency of 1 Hz
frequencies = linspace(-fs/2, fs/2, N);
6. Plot the amplitude spectrum centered at the zeroth frequency.
plot(frequencies, amplitude_spectrum);
xlabel('Frequency (Hz)');
ylabel('Amplitude');
title('Amplitude Spectrum Centered at Zero Frequency');
For more information regarding "fft" and "fftshift" functions, kindly refer to the following documentation:
I hope this answer resolves your query.
Regards,
Nithin Kumar.
