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How do I fix this error?

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Isyraf Izuddin
Isyraf Izuddin 2021-1-12
评论： Isyraf Izuddin 2021-1-12
clear all
clc
syms s
K=1;
Gnum=(50/3)*K;
Gden=sym2poly((s+5)*(s+(10/3))*(s+2));
G=tf(Gnum,Gden);
H=20/(s+20);
figure
rlocus(G*H*K);
T=feedback(G*K,H);
figure
step(T)
figure
rlocus(T)
Error using * (line 80)
Invalid operand. Variables of type "sym" cannot be combined with other models.
Error in rootlocusKanalysis (line 16)
rlocus(G*H*K);

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采纳的回答

Walter Roberson
Walter Roberson 2021-1-12
Ran in:
You can never create a tf directly from something symbolic.
s = tf('s');
K=1;
Gnum=(50/3)*K;
Gden=(s+5)*(s+(10/3))*(s+2);
G=tf(Gnum,Gden);
H=20/(s+20);
figure
rlocus(G*H*K);
T=feedback(G*K,H);
figure
step(T)
figure
rlocus(T)
  3 个评论
显示 1更早的评论
Walter Roberson
Walter Roberson 2021-1-12
Ran in:
In that video, at no point does the speaker use a symbolic H.
clear all
clc
syms s
K=1;
Gnum=(50/3)*K;
Gden=sym2poly((s+5)*(s+(10/3))*(s+2));
G=tf(Gnum,Gden);
Hnum = 20;
Hden = sym2poly(s+20);
H=tf(Hnum,Hden)
H = 20 ------ s + 20 Continuous-time transfer function.
figure
rlocus(G*H*K);
T=feedback(G*K,H);
figure
step(T)
figure
rlocus(T)
Isyraf Izuddin
Isyraf Izuddin 2021-1-12
Thank you very much... very appriciate your help... may Allah bless you...

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