fix bug in the way dir=-1 arrows are handled at endpoint

murrayrm · murrayrm · commit 57e3e4efc8e1 · 2024-06-07T23:22:44.000-07:00
diff --git a/control/freqplot.py b/control/freqplot.py
@@ -1991,7 +1991,6 @@ def _add_arrows_to_line2D(
 
         elif dir == -1:
             # Orient the arrow in the other direction on the segment
-            n = s.size - 2 if n == s.size - 1 else n    # move backward at end
             arrow_tail = (x[n + 1], y[n + 1])
             arrow_head = (np.mean(x[n:n + 2]), np.mean(y[n:n + 2]))
 
diff --git a/examples/pvtol-nested.py b/examples/pvtol-nested.py
@@ -61,8 +61,6 @@
 Hi = ct.parallel(ct.feedback(Ci, Pi), -m * g *ct.feedback(Ci * Pi, 1))
 
 plt.figure(4)
-plt.clf()
-plt.subplot(221)
 ct.bode_plot(Hi)
 
 # Now design the lateral control system
@@ -129,7 +127,7 @@
 #
 plt.figure(7)
 plt.clf()
-ct.nyquist_plot(L, (0.0001, 1000))
+ct.nyquist_plot(L)
 
 # Add a box in the region we are going to expand
 plt.plot([-2, -2, 1, 1, -2], [-4, 4, 4, -4, -4], 'r-')
