ArmaFft.spddirect(n) [source]
power spectral density using padding to length n done by fft
currently returns two-sided according to fft frequencies, use first half
© 2009–2012 Statsmodels Developers
© 2006–2008 Scipy Developers
© 2006 Jonathan E. Taylor
Licensed under the 3-clause BSD License.
http://www.statsmodels.org/stable/generated/statsmodels.sandbox.tsa.fftarma.ArmaFft.spddirect.html