How to display a splane grid such as sgrid on the positive real axis area?

Question

John Tsinetakes 2019-8-21

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https://ww2.mathworks.cn/matlabcentral/answers/477071-how-to-display-a-splane-grid-such-as-sgrid-on-the-positive-real-axis-area

回答： Sai Sri Pathuri 2019-8-27

Is there a way to plot the s plane grid on both sides of the real axis?

The example code below plots poles on both the negative real and postive real axis, but the sgrid command olyn generates a grid on the neagtive real side.

figure(1)
axis(50000*[-.2,.2,-1,1]);
sgrid
ylabel('Imaginary axis');
xlabel('Real axis');
hold on
Poles = [-5000+10000i ; 5000+10000i ; -5000-10000i ; 5000-10000i];
plot(real(Poles),imag(Poles),'x');

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Answer 1

Sai Sri Pathuri 2019-8-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/477071-how-to-display-a-splane-grid-such-as-sgrid-on-the-positive-real-axis-area#answer_389253

The reason sgrid function plots the grid only on the left-hand plane is because poles in the right half plane are unstable.

However, if you want to plot the grid on the positive side of real axis, you can create a custom function by modifying the source code of sgrid to plot the grid.