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ord2
Generate continuous second-order systems[A,B,C,D] = ord2(wn,z) [num,den] = ord2(wn,z)[A,B,C,D] = ord2(wn,z) generates the state-space description (A,B,C,D) of the second-order system:
given the natural frequency wn and damping factor z. Use ss to turn this description into a state-space object.
[num,den] = ord2(wn,z) returns the numerator and denominator of the second-order transfer function. Use tf to form the corresponding transfer function object.
Generate an LTI model of the second-order transfer function with damping factor 
and natural frequency 
» [num,den] = ord2(2.4,0.4)
num =
1
den =
1.0000 1.9200 5.7600
» sys = tf(num,den)
Transfer function:
1
-------------------
s^2 + 1.92 s + 5.76
rmodel, rss Generate random stable continuous models
ss Create a state-space LTI model
tf Create a transfer function LTI model