Diferent answers to same cmd

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Ken
Ken 2025-2-20
评论： Sam Chak 2025-2-21
I am trying to figure out Matlab. Tried the cmd shown in the attachment, get different response(see attachment)
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Ken
Ken 2025-2-20
The original post showed 2 images of the 2 separate cmds used with the resultswhich are quite different, cannot dig why they are different
Voss
Voss 2025-2-20
@Ken: What are the different results/responses you see? Only one of your screenshots shows a result in the command window, which is the result of P=poly(P), a command which does not appear in the other screenshot.

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Ken
Ken 2025-2-21
As mentioned earlier, I am trying to get familiar with MATLAB in aircraft controls. Focus now is Matlab. I saw a presentation with Matlab code which I posted a screenshot of. (I also posted my code to compare). Tried to duplicate the code but do not get the result shown in the Matlab window of the screenshot. Trying to figure out if something missing on my end.
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Sam Chak
Sam Chak 2025-2-21
Hi @Ken,
Thank you for your response. One plausible explanation for the differing results is that your Aircraft Control Professor may have used functions from a decade-old version of MATLAB and the Control System Toolbox. Most professors I know do not frequently update their lecture slides. Therefore, if you are using more recent versions of MATLAB and the Control System Toolbox, you are likely obtaining different results.
The best approach would be to post the Control Problem Example from the lecture slides so that we can verify which result is correct or more accurate. In some rare cases, bugs can occur after MATLAB is updated.

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Walter Roberson
Walter Roberson 2025-2-20
A=[-.01 .1 0 32.2;-0.4 -.8 180 0;0 -.003 -.5 0;0 0 1 0]
Your screen image shows you using -32.2 rather than 32.2
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Ken
Ken 2025-2-20
I am trying to compare my code with one at a presentation of which I do not have the code in text. I thought ctrb gives the matrix and poly gives the polynomial of that matrix equation.
Sam Chak
Sam Chak 2025-2-20
Hi Mr. @Ken
I noticed from your screenshots that your issue pertains to the controller design problem. Would you please describe the original control problem so that we can understand the full context that led to the 'cmd' issue?

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