Feedback Function Not enough input arguments error

15 次查看（过去 30 天）
Victor Jimenez Carrillo
评论： Star Strider 2021-11-29
So here is my code below when I run it it gives me a error which should not happen. Any suggestions as to what to do inorder to fix this small error? I own all of packages required. It should just work.
syms s
k=0.0223; theta=60; Tau=12.6;
kc=3.75; TauD=0; TauI=12.6;
G=(k*exp(-theta*s))/(Tau*s+1)
C=kc*(1+1/(TauI*s)+TauD*s)
sys = feedback(G*C,1);
step(sys)

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采纳的回答

Star Strider
Star Strider 2021-11-29
Ran in:
Please do not mix Symbolic Math Toolbox and Control System Toolbox commands.
It only confuses both of them!
k=0.0223; theta=60; Tau=12.6;
kc=3.75; TauD=0; TauI=12.6;
s = tf('s'); % ,— ADD THIS ASSIGNMENT
G=(k*exp(-theta*s))/(Tau*s+1)
G = 0.0223 exp(-60*s) * ---------- 12.6 s + 1 Continuous-time transfer function.
C=kc*(1+1/(TauI*s)+TauD*s)
C = 47.25 s + 3.75 -------------- 12.6 s Continuous-time transfer function.
sys = feedback(G*C,1);
step(sys)
.

更多回答（1 个）

Walter Roberson
Walter Roberson 2021-11-29
feedback() does not accept symbolic expressions.

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