how to run fft in matlab and just get amplitude in matlab

To run Fast Fourier Transform (FFT) in MATLAB and retrieve only the amplitude values, you can follow the steps below:


main.m
% Create a sample signal
fs = 1000; % sampling frequency
t = 0:1/fs:1-1/fs; % time vector
f = 10; % frequency of the signal
x = 5*sin(2*pi*f*t); % signal with frequency 10Hz

% Perform FFT
N = length(x); % length of the signal
X = fft(x, N); % compute FFT
frequencies = (0:N-1) * fs/N; % frequency vector

% Retrieve amplitude values
amplitude = abs(X)/N; % compute amplitude (magnitude) of the FFT and normalize by N

% Plot the frequency spectrum
plot(frequencies, amplitude);
xlabel('Frequency (Hz)');
ylabel('Amplitude');
title('Amplitude Spectrum');
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In this code snippet, we first create a sample signal, then compute the FFT of the signal using the fft function. By taking the absolute value of the FFT result and normalizing it by the length of the signal, we get the amplitude values. Finally, we plot the frequency spectrum by plotting the frequency vector against the amplitude values.

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fft