Solves the Discrete Lyapunov Equation (A’XA-X=-Q) directly.
Parameters : | a : array_like
q : array_like
|
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Returns : | x : array_like
|
Notes
Algorithm is based on a direct analytical solution from: Hamilton, James D. Time Series Analysis, Princeton: Princeton University Press, 1994. 265. Print. http://www.scribd.com/doc/20577138/Hamilton-1994-Time-Series-Analysis