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fix bug in root_locus_plot identified by @NikolaiVChr in issue #1016 #1021

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Merged
merged 1 commit into from
Jul 7, 2024
Merged

fix bug in root_locus_plot identified by @NikolaiVChr in issue #1016 #1021

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11 changes: 4 additions & 7 deletions control/pzmap.py
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Original file line number Diff line number Diff line change
Expand Up @@ -496,19 +496,17 @@ def _find_root_locus_gain(event, sys, ax):
# Get the current axis limits to set various thresholds
xlim, ylim = ax.get_xlim(), ax.get_ylim()

# Catch type error when event click is in the figure but not in an axis
# Catch type error when event click is in the figure but not on curve
try:
s = complex(event.xdata, event.ydata)
K = -1. / sys(s)
K_xlim = -1. / sys(
complex(event.xdata + 0.05 * abs(xlim[1] - xlim[0]), event.ydata))
K_ylim = -1. / sys(
complex(event.xdata, event.ydata + 0.05 * abs(ylim[1] - ylim[0])))

except TypeError:
K = float('inf')
K_xlim = float('inf')
K_ylim = float('inf')
K, s = float('inf'), None
K_xlim = K_ylim = float('inf')

#
# Compute tolerances for deciding if we clicked on the root locus
Expand All @@ -526,9 +524,8 @@ def _find_root_locus_gain(event, sys, ax):
if abs(K.real) > 1e-8 and abs(K.imag / K.real) < gain_tolerance and \
event.inaxes == ax.axes and K.real > 0.:
return K.real, s

else:
return None, s
return None, None


# Mark points corresponding to a given gain on root locus plot
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