fftn

N dimensional fast Fourier transform (FFT).

Syntax

f = fftn(x)

f = fftn(x, dims)

Inputs

x: The signal to be transformed into the frequency domain.; Type: double; Dimension: vector | matrix
dims: The dimension lengths of the FFT.; Type: integer; Dimension: vector

Outputs

f: The frequency domain representation of x.

Comments

The dimensions of the FFT, dims, default to the dimensions of the matrix being transformed. If dims are not the defaults, the signal matrix is either truncated or extended with zeros to the specified lengths.

fftn uses the FFTW library.