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Operators and Keywords

Function List:

C++ API

: fft (x)
: fft (x, n)
: fft (x, n, dim)

Compute the discrete Fourier transform of A using a Fast Fourier Transform (FFT) algorithm.

The FFT is calculated along the first non-singleton dimension of the array. Thus if x is a matrix, fft (x) computes the FFT for each column of x.

If called with two arguments, n is expected to be an integer specifying the number of elements of x to use, or an empty matrix to specify that its value should be ignored. If n is larger than the dimension along which the FFT is calculated, then x is resized and padded with zeros. Otherwise, if n is smaller than the dimension along which the FFT is calculated, then x is truncated.

If called with three arguments, dim is an integer specifying the dimension of the matrix along which the FFT is performed

See also: ifft, fft2, fftn, fftw.

Package: octave