Follow-on to 5f34a7b

josiahdelange · josiahdelange · commit f0e2d746a350 · 2025-04-26T10:34:04.000-04:00
diff --git a/control/tests/margin_test.py b/control/tests/margin_test.py
@@ -377,9 +377,6 @@ def test_siso_disk_margin():
     # Frequencies of interest
     omega = np.logspace(-1, 2, 1001)
 
-    # Laplace variable
-    s = tf('s')
-
     # Loop transfer function
     L = tf(25, [1, 10, 10, 10])
 
@@ -400,9 +397,6 @@ def test_mimo_disk_margin():
     # Frequencies of interest
     omega = np.logspace(-1, 3, 1001)
 
-    # Laplace variable
-    s = tf('s')
-
     # Loop transfer gain
     P = ss([[0, 10],[-10, 0]], np.eye(2), [[1, 10], [-10, 1]], [[0, 0],[0, 0]]) # plant
     K = ss([],[],[], [[1, -2], [0, 1]]) # controller
diff --git a/examples/disk_margins.py b/examples/disk_margins.py
@@ -3,9 +3,7 @@
 """
 
 import os
-import math
 import control
-import matplotlib
 import matplotlib.pyplot as plt
 import numpy as np
 
