How do I fix this error?

4 次查看（过去 30 天）
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);

请先登录，再回答此问题。

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...

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Electrical Sensors 的更多信息

标签

产品


版本

R2020b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by