ArmaFft.spdroots(w) [source]
spectral density for frequency using polynomial roots
builds two arrays (number of roots, number of frequencies)
© 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.spdroots.html