diff --git a/control/phaseplot.py b/control/phaseplot.py
index 6f7ed355f..e6123bc0e 100644
--- a/control/phaseplot.py
+++ b/control/phaseplot.py
@@ -532,8 +532,7 @@ def equilpoints(
out = []
for xeq in equilpts:
with plt.rc_context(rcParams):
- out.append(
- ax.plot(xeq[0], xeq[1], marker='o', color=color))
+ out += ax.plot(xeq[0], xeq[1], marker='o', color=color)
return out
@@ -649,8 +648,7 @@ def separatrices(
for i, xeq in enumerate(equilpts):
# Plot the equilibrium points
with plt.rc_context(rcParams):
- out.append(
- ax.plot(xeq[0], xeq[1], marker='o', color='k'))
+ out += ax.plot(xeq[0], xeq[1], marker='o', color='k')
# Figure out the linearization and eigenvectors
evals, evecs = np.linalg.eig(sys.linearize(xeq, 0, params=params).A)
@@ -691,13 +689,13 @@ def separatrices(
# Plot the trajectory (if there is one)
if traj.shape[1] > 1:
with plt.rc_context(rcParams):
- out.append(ax.plot(
- traj[0], traj[1], color=color, linestyle=linestyle))
+ out += ax.plot(
+ traj[0], traj[1], color=color, linestyle=linestyle)
# Add arrows to the lines at specified intervals
with plt.rc_context(rcParams):
_add_arrows_to_line2D(
- ax, out[-1][0], arrow_pos, arrowstyle=arrow_style,
+ ax, out[-1], arrow_pos, arrowstyle=arrow_style,
dir=1)
return out
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