def test_zero_siso(self):
"""Evaluate the zeros of a SISO system."""
# extract only first input / first output system of sys222. This system is denoted sys111
# or tf111
tf111 = ss2tf(self.sys222)
sys111 = tf2ss(tf111[0, 0])
# compute zeros as root of the characteristic polynomial at the numerator of tf111
# this method is simple and assumed as valid in this test
true_z = np.sort(tf111[0, 0].zero())
# Compute the zeros through ab08nd, which is tested here
z = np.sort(sys111.zero())
np.testing.assert_almost_equal(true_z, z)
def test_zero_siso(self):
"""Evaluate the zeros of a SISO system."""
# extract only first input / first output system of sys222. This system is denoted sys111
# or tf111
tf111 = ss2tf(self.sys222)
sys111 = tf2ss(tf111[0, 0])
# compute zeros as root of the characteristic polynomial at the numerator of tf111
# this method is simple and assumed as valid in this test
true_z = np.sort(tf111[0, 0].zero())
# Compute the zeros through ab08nd, which is tested here
z = np.sort(sys111.zero())
np.testing.assert_almost_equal(true_z, z)