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Nyquist plot uses incorrect subplot axes #1144

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ondras12345 opened this issue Apr 16, 2025 · 1 comment · Fixed by #1145
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Nyquist plot uses incorrect subplot axes #1144

ondras12345 opened this issue Apr 16, 2025 · 1 comment · Fixed by #1145
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@murrayrm
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0.10.2

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@ondras12345
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import control as ctl
import matplotlib.pyplot as plt
P = ctl.tf([1], [2, 1])

fig, ax = plt.subplots(2,2)
ctl.nyquist_plot(P, ax=ax[1,0])
plt.show()

The nyquist plot always shows up in the botom right corner, no matter what index into ax I use.

When I replace the nyquist with step, it shows up at the correct position (bottom left in this case):

fig, ax = plt.subplots(2,2)
ctl.step_response(P).plot(ax=ax[1,0])
plt.show()

Version: control==0.10.1
@murrayrm murrayrm added this to the 0.10.2 milestone Apr 17, 2025
@murrayrm murrayrm self-assigned this Apr 17, 2025
@murrayrm
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This was also pointed out by @JonHowMIT in #1143.

@murrayrm murrayrm mentioned this issue Apr 17, 2025
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fix ax processing bug in {nyquist,nichols,describing_function}_plot murrayrm/python-control
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@murrayrm @ondras12345