Unrecognized function or variable

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Aysel Alimirzayeva
Aysel Alimirzayeva 2022-10-13
评论： Aysel Alimirzayeva 2022-10-14
Hello. I wrote an example of the diskmarginplot function in Matlab 2019Rb version, but it gives an error. Please help me.
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DGM
DGM 2022-10-13
Where is diskmarginplot.m? Did you add it to the path or place it in a directory that's on the path?

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Sam Chak
Sam Chak 2022-10-14
Ran in:
Hi @Aysel Alimirzayeva
It requires Robust Control Toolbox, the function is introduced in R2020a. Since yours is R2019b, then I think ...
https://www.mathworks.com/help/robust/ref/lti.diskmarginplot.html
s = tf('s');
G = 0.38*(s^2 + 0.1*s + 0.55)/(s*(s + 1)*(s^2 + 0.06*s + 0.5))
G = 0.38 s^2 + 0.038 s + 0.209 --------------------------------- s^4 + 1.06 s^3 + 0.56 s^2 + 0.5 s Continuous-time transfer function.
diskmarginplot(G)

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