conda install matplotlib scipy
import matplotlib.pyplot as plt
from scipy import signal
syt=signal.TransferFunction([1],[1,2,15],dt=0.06)
w,H=signal.dfreqresp(syt)
plt.figure()
plt.plot(H.real,H.imag,"b")
plt.plot(H.real,-H.imag,"r")
plt.title("Nyquist Plot")
plt.show()
https://wolfram.com/xid/0e5czfwliw2dia-beoh6k
https://www.wolframalpha.com/input?i2d=true&i=nyquistplotDivide%5B1%2CPower%5Bs%2C2%5D%5C%2840%291%2Bs%5C%2841%29%5D
https://reference.wolfram.com/language/ref/NyquistPlot.html
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