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isstable (sys, tol) #
feedback (sys) # equivalent to feedback (sys, eye (size (sys)))
feedback (sys, "+") # equivalent to feedback (sys, eye (size (sys)), +1)
H = sys(w) # equivalent to H = freqresp (sys, w) where w is a frequency vector
place (sys, p, alpha) # If parameter alpha is specified, poles with real parts
place (a, b, p, alpha) # (continuous time) or moduli (discrete time) below alpha
# are left untouched.
sminreal (sys, tol) # Optional tolerance for controllability and observability.
# Entries of the state-space matrices whose moduli are less or
# equal to TOL are assumed to be zero. Default value is 0.
frd (sys) # calculate interesting frequency range by the zeros and poles of SYS.
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