Error simple program PID

2 次查看（过去 30 天）
JOJO
JOJO 2014-1-15
编辑： JOJO 2014-5-27
Hello, I doing a pid project I have everything correct but this error come up what I should do?

请先登录，再回答此问题。

采纳的回答

JOJO
JOJO 2014-1-15
in my second compute it works, however I dont know how to find the tooboxes
  1 个评论
Mischa Kim
Mischa Kim 2014-1-15
Type
which -all syms
and you should get something like
C:\Program Files\MATLAB\R2013b\toolbox\symbolic\symbolic\syms.m

请先登录，再进行评论。

更多回答（5 个）

Mischa Kim
Mischa Kim 2014-1-15
Interesting. The code is just fine.
Try this: copy-and-paste the code from your question above and paste it into the MATLAB command window. Execute.
  1 个评论
Mischa Kim
Mischa Kim 2014-1-15
I assume you have the Symbolic Toolbox licensed?
Also, please post comments as comments.

请先登录，再进行评论。

JOJO
JOJO 2014-1-15
I tried it give me this error I dont know why
David Sanchez
David Sanchez 2014-1-15
I tried your code (copy-paste) and it works. Make sure you have the Symbolic Math toolbox:
Start (bottom left corner)-> Toolboxes
You should see the all the toolboxes of your system, if you do not locate the Symbolic Math toolbox, you can not use
syms
JOJO
JOJO 2014-1-15
编辑：JOJO 2014-2-2
I used control theory it worked.
Thanks Davi
Carla
Carla 2014-1-15
Is there a reason you need to do this with syms? At least in the code you showed, it doesn't look like you are using any Symbolic Toolbox functionality. You can achieve the same exact result using only Control System Toolbox as follows:
num=1; % Numerator
den=[1,3,1]; % Denominator
G=tf(num,den); % Transfer Function
H=1; % Negative Feedback Loop with Unity Feedback
Kp=1; % Increment these three varaibles to give desired output
Ki=0;
Kd=0;
C=pid(Kp,Ki,Kd); % Controller Function
T=feedback(C*G,H); % C in series with G with negative feedback H
step(T) % Step Response with Controller
If there is some reason elsewhere in your program that you need syms functionality, I suppose this won't solve your problem!

类别

在 Help Center 和 File Exchange 中查找有关 Symbolic Math Toolbox 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by