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Trouble using Bode(sys)

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Eli Wolkenstein
Eli Wolkenstein on 11 May 2023
Commented: Star Strider on 15 May 2023
I try using the bode function and i get an error that says "Error using DynamicSystem/bode
Dimensions of arrays being concatenated are not consistent." I have seen bode being used even what the arrays are not the same size. Anybody know what's wrong? (I just ran it in this question box and it worked now so why wont it work for me on my MATLAB? I have the control systems toolbox.
m = 2;
b = 5;
k = 600;
Ybar = 20;
sys = tf([k],[m b k]);
figure
hold on
bode(sys)
grid on

Answers (2)

Star Strider
Star Strider on 15 May 2023
You could have a path problem.
Run these:
restoredefaultpath
rehash toolboxcache
from a script or your Command Window to see if that solves the problem.
  3 Comments
Star Strider
Star Strider on 15 May 2023
At this point I suggest that you Contact Support . Include a link to this thread so they know what steps you’ve already taken, and the results.
It might be necessary to uninstall and reinstall MATLAB.
Meanwhile, use MATLAB Online to complete the assignment. That’s a temporary work-around until you can get it working on your computer again (although I use it extensively for prototyping Answers code, since it doesn’t have the 55 second limit that the online Run feature has, and it’s actually easier to use for that purpoose). You’ll have access to everything you’re licensed for.

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Manoj Mirge
Manoj Mirge on 15 May 2023
It might be possible that you have your own custom “tf" or bode" function defined somewhere in your MATLAB path and at the time of calling those functions in your MATLAB script the script is calling the custom function instead of MATLAB’s built in bode and tf" functions.
To check if you have a local custom function shadowing the MATLAB’s built-in function you can use which" function. If you have a local function shadowing the built-in function, you can delete that function or remove that function from MATLAB path.
You can read more about how to use which function in the below link:
  1 Comment
Eli Wolkenstein
Eli Wolkenstein on 15 May 2023
when I run the which function it returns this:
>> which tf
C:\Program Files\MATLAB\R2023a\toolbox\control\ctrlmodels\@tf\tf.m % tf constructor
>> which bode
C:\Program Files\MATLAB\R2023a\toolbox\control\ctrlobsolete\bode.m
which I believe are the correct functions for what I'm trying to use. It's not showing me any other "tf" or "bode" custom function I might hve made.

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