I'm plotting the Nyquist diagram of a transfer function which has poles on the imaginary axis:

import controlimport matplotlib.pyplot as pltimport numpy as npK = 1Gp =  control.tf([1], [1,1,0,0,0]) Gc = control.tf([K], [1]) control.nyquist_plot(Gp*Gc,plot=True,omega_num=1000)plt.show()

Which results in the following incorrect plot, that does not show infinte semicircles, but something incorrect:

Also usingindent_direction andindent_radius did not solve this.
The trick I found that makes it work is if I addomega_limits=[0.001,10000] to nyquist_plot:

Can you please fix such that the incorrect 'line' does not appear?