In MATLAB, use feedback() command to obtain the closed loop transfer function. Do not use L/(1 L).
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Always use feedback() command to compute the closed loop transfer functions. L/(1+L) sometimes doesn't do the cancellation properly.
The Gang of Four can be obtained by:
S: feedback(1,L)
T: feedback(L,1)
PS: feedback(P,C)
CS: feedback(C,P)
--Shuo
