Expand Up @@ -338,13 +338,19 @@ def test_zmore_stability_margins(tsys_zmore): 'cnum, cden, dt,' 'ref,' 'rtol', [([2], [1, 3, 2, 0], 1e-2, # gh-465 (2.9558, 32.8170, 0.43584, 1.4037, 0.74953, 0.97079), 0.1 # very crude tolerance, because the gradients are not great ), ([2], [1, 3, 3, 1], .1, # 2/(s+1)**3 [3.4927, 69.9996, 0.5763, 1.6283, 0.7631, 1.2019], 1e-3)]) [( # gh-465 [2], [1, 3, 2, 0], 1e-2, [2.9558, 32.390, 0.43584, 1.4037, 0.74951, 0.97079], 2e-3), # the gradient of the function reduces numerical precision ( # 2/(s+1)**3 [2], [1, 3, 3, 1], .1, [3.4927, 65.4212, 0.5763, 1.6283, 0.76625, 1.2019], 1e-4), ( # gh-523 [1.1 * 4 * np.pi**2], [1, 2 * 0.2 * 2 * np.pi, 4 * np.pi**2], .05, [2.3842, 18.161, 0.26953, 11.712, 8.7478, 9.1504], 1e-4), ]) def test_stability_margins_discrete(cnum, cden, dt, ref, rtol): """Test stability_margins with discrete TF input""" tf = TransferFunction(cnum, cden).sample(dt) Expand Down