def test_shape(self, states, outputs, inputs):
"""Test that drss outputs have the right state, input, and output size."""
sys = drss(states, outputs, inputs)
assert sys.nstates == states
assert sys.ninputs == inputs
assert sys.noutputs == outputs
assert sys.dt is True
def test_strictly_proper(self, strictly_proper):
"""Test that the strictly_proper argument returns a correct D."""
for i in range(100):
# The probability that drss(..., strictly_proper=False) returns an
# all zero D 100 times in a row is 0.5**100 = 7.89e-31
sys = drss(1, 1, 1, strictly_proper=strictly_proper)
if np.all(sys.D == 0.) == strictly_proper:
break
assert np.all(sys.D == 0.) == strictly_proper
def test_pole(self, states, outputs, inputs):
"""Test that the poles of drss outputs have less than unit magnitude."""
sys = drss(states, outputs, inputs)
p = sys.pole()
for z in p:
assert abs(z) < 1
