Any way to mark (1+0j) in Nyquist diagram

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嵩人 藤森
嵩人 藤森 2021-6-24
评论： 嵩人 藤森 2021-7-16
Hi, I'm trying to mark (1+0j) and invalidate (-1+0j) in Nyquist diagram cuz I'm analyzing a positeve feedback system.I can't find any information about it on the reference.

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Bhavya Chopra
Bhavya Chopra 2021-7-8
I understand that you want to plot the points (1 + 0j) and (-1 + 0j) to mark them on the Nyquist plot. Consider the following Nyquist plot:
sys = tf(1,[1,1,1]);
nyquist(sys);
The points (1, 0) and (-1, 0) can be marked on the plot as follows:
hold on;
plot(1, 0, "o")
plot(-1, 0, "o")
hold off;

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