Comments (3)
You can get a valid Nyquist plot from the frequency response in some instances and with some assumptions. Basically, if the open loop dynamics are assumed stable, the zero frequency gain is finite, and the high frequency gain is zero, it should work.
The error above comes when it tries to compute the default frequency range for the plot, but in the case of frequency response data you don't actually need to do that.
A quick fix is to change the call to be ct.nyquist_plot(freq_response, freq_response.omega)
, which bypasses the computation of the default frequency range.
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Is it possible to make a Nyquist plot given only frequency response data?
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