statsmodels.sandbox.tsa.fftarma.ArmaFft.fftarma¶
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ArmaFft.
fftarma
(n=None)[source]¶ Fourier transform of ARMA polynomial, zero-padded at end to n
The Fourier transform of the ARMA process is calculated as the ratio of the fft of the MA polynomial divided by the fft of the AR polynomial.
Parameters: n : int
length of array after zero-padding
Returns: fftarma : ndarray
fft of zero-padded arma polynomial