Why do I get error when solve the bode plot
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clear all
clc
R1=3143;
R2=5000;
R3=1000;
Rf=1000;
L=10000;
C1=2.53*(10^-5);
C2=3.1831*(10^-5);
num=[(R1*R2*C1*C2*L*(R3+Rf)^2) 0 0 0]; den=[(C1*C2*R1*R2*R3*L) (C1*R1*R3*L)+(C2*R2*R3*L) (R3*L)+(C2*R1*R2*R3) (R1*R3)];
sys=tf(num,den);
figure
bode(sys)
回答（1 个）
Star Strider
2020-12-18
0 个投票
Your code runs without error in R2020b.
What MATLAB version are you using?
What is the error?
4 个评论
Kamar Ledgister
2020-12-18
Star Strider
2020-12-18
I get (1x4) double vectors for both ‘num’ and ‘den’ using the code you posted (no modifications), and get no errors. I also do not see that your code vertically concatenates anything. I also do not see any bode functions other than those in the Conmtrol System and System Identification Tookboxes in the online documentation.
The only other thing I can think of is that you have somehow created your own ‘bode’ function that is overshadowing the built-in bode functions.
Run this line from a script or your Command Window:
which bode -all
You should only get:
C:\Program Files\MATLAB\R2020b\toolbox\control\ctrlobsolete\bode.m
C:\Program Files\MATLAB\R2020b\toolbox\shared\controllib\engine\@DynamicSystem\bode.m % Shadowed DynamicSystem method
If anything else appears, that is the problem. The solution is to re-name the function you created to something else that makes sense in context and does not overshadow any MATLAB function.
Kamar Ledgister
2020-12-18
Star Strider
2020-12-18
My pleasure!
If my Answer helped you solve your problem, please Accept it!
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