Unrecognized function or variable
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Aysel Alimirzayeva
le 13 Oct 2022
Commenté : Aysel Alimirzayeva
le 14 Oct 2022
Hello. I wrote an example of the diskmarginplot function in Matlab 2019Rb version, but it gives an error. Please help me.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1155648/image.png)
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DGM
le 13 Oct 2022
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
le 14 Oct 2022
It requires Robust Control Toolbox, the function is introduced in R2020a. Since yours is R2019b, then I think ...
s = tf('s');
G = 0.38*(s^2 + 0.1*s + 0.55)/(s*(s + 1)*(s^2 + 0.06*s + 0.5))
diskmarginplot(G)
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