Why do I get error when solve the bode plot

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)

Answer 1

[Star Strider]

Your code runs without error in R2020b.

What MATLAB version are you using?

What is the error?

[Kamar Ledgister]

2020b

These are errors

Error using vertcat

Dimensions of arrays being concatenated are not consistent.

Error in bode_C1 (line 11)

den=[(C1*C2*R1*R2*R3*L) (C1*R1*R3*L)+(C2*R2*R3*L) (R3*L)+(C2*R1*R2*R3)

[Star Strider]

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]

Thank you

[Star Strider]

My pleasure!

If my Answer helped you solve your problem, please Accept it!

.