fft
Fast Fourier transform.
📝Syntax
Y = fft(X)
Y = fft(X, n)
Y = fft(X, n, dim)
📥Input Arguments
Parameter Description
X a vector, matrix or N-D array (double, single, integer, logical).
n transform length: a non negative integer scalar or [] (default).
dim dimension: a positive integer scalar.
📤Output Arguments
Parameter Description
Y a vector, matrix, N-D array: frequency domain representation.
📄Description

fft(X) computes the discrete Fourier transform of X using a Fast Fourier Transform (FFT) algorithm based on FFTW library.

💡Examples
 % Sampling frequency
Fs = 150;

% Time vector of 1 second
t = 0:1*inv(Fs):1;

% Creates a sine wave of f Hz.
f = 5; 
x = sin(2 * pi * t * f);

% Length of FFT
nfft = 1024; 
% Take fft, padding with zeros so that length(X) is equal to nfft
X = fft(x, nfft)
% FFT is symmetrix
X = X(1:nfft*inv(2))

% Frequency vector
f = (0:nfft *inv(2) -1)*Fs * inv(nfft);
🔗See Also
ifftfftw
🕔Version History
Version Description
1.0.0 initial version
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