How can you turn on 'All Stability Margins' when using the 'bode' function via script?

Question

Jason 2014-6-19

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https://ww2.mathworks.cn/matlabcentral/answers/136462-how-can-you-turn-on-all-stability-margins-when-using-the-bode-function-via-script

编辑： Erick Oberstar 2022-4-17

Instead of right clicking on the bode plot and selecting Characteristics -> Minimum Stability Margins, how can I do this automatically via scripting? I don't want to manually do it. (Matlab 2012b)

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Answer 1

Arkadiy Turevskiy 2014-7-11

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在 MATLAB Online 中打开

You can use function margin:

sys=tf(1,[1 1 0]);
margin(sys)

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Answer 2

Erick Oberstar 2022-4-17

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https://ww2.mathworks.cn/matlabcentral/answers/136462-how-can-you-turn-on-all-stability-margins-when-using-the-bode-function-via-script#answer_944740

编辑：Erick Oberstar 2022-4-17

在 MATLAB Online 中打开

As of Matlab 2020b I can verify this works for both nyqistplot and bodeplot functions

Ts= 0.01
n = [0 0.3680 0.2640];
d = [1.0 -1.368 0.3680];
Gz = tf(n,d,Ts)
Gz.Variable = 'z^-1'
figure; h1=nyquistplot(Gz) 
axis([-1.5 1.5 -1.5 1.5]); grid on;
h1.showCharacteristic('AllStabilityMargins');
%zoomcp(h1);% Optional zoom in on critical point 
figure; h2 = bodeplot(Gz)
h2.showCharacteristic('AllStabilityMargins');