diff --git a/control/pzmap.py b/control/pzmap.py
index d7662d1d9..dd3f9e42b 100644
--- a/control/pzmap.py
+++ b/control/pzmap.py
@@ -496,7 +496,7 @@ 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)
@@ -504,11 +504,9 @@ def _find_root_locus_gain(event, sys, ax):
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
@@ -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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