Slow and fast modes decomposition
[G1,G2] = slowfast(G,ns)
slowfast computes the slow and fast modes
decompositions of a system G(s) such that
G(s) = [G1(s)] + [G2(s)]
G(s) contains the
N slowest modes (modes with
the smallest absolute value) of
denotes the slow part of G(s). The slow poles have low frequency and magnitude values.
denotes the fast part. The fast poles have high frequency and magnitude values.
ns denotes the index where the modes will be
freqsep to separate slow and fast
modes at a specified cutoff frequency instead of a specified number of modes.
M.G. Safonov, E.A. Jonckheere, M. Verma and D.J.N. Limebeer, “Synthesis of Positive Real Multivariable Feedback Systems”, Int. J. Control, vol. 45, no. 3, pp. 817-842, 1987.