def test_eq(self):
# Check that linear filters are equal iff. they share a numerator and
# denominator.
lpf = LowpassFilter(0, False, 0.1)
lf1 = LinearFilter(0, False, [1.0], [0.1, 0.2])
lf2 = LinearFilter(0, False, [1.0], [0.1, 0.3])
lf3 = LinearFilter(0, False, [1.0], [0.1, 0.2])
assert lf1 != lpf
assert lf2 != lf1
assert lf3 != lf2
assert lf3 == lf1
def test_from_parameters_force_width(self):
# Create the mock signal and connection
signal = SignalParameters(latching=True)
rps = ReceptionParameters(nengo.LinearFilter([1.0], [0.5, 1.0]), 1)
# Create the filter
lpf = LinearFilter.from_parameters(signal, rps, width=2)
assert lpf == LinearFilter(2, True, [1.0], [0.5, 1.0])
def test_pack_data(self, num, den, dt, order):
# Create the filter
lf = LinearFilter(0, False, num, den)
# Create a buffer to pack data into
data = bytearray((order * 2 + 1) * 4)
# Pack the parameters
lf.pack_data(dt, data, 0)
# Generate what we expect the data to look like
numd, dend, _ = cont2discrete((num, den), dt)
numd = numd.flatten()
exp = list()
for a, b in zip(dend[1:], numd[1:]):
exp.append(-a)
exp.append(b)
expected_data = tp.np_to_fix(np.array(exp)).tostring()
# Check that's what we get
assert struct.unpack_from("<I", data, 0)[0] == order
assert data[4:] == expected_data
def test_size_words(self, num, den, size_words):
lf = LinearFilter(0, False, num, den)
assert lf.size_words() == size_words
def test_method_index(self):
lf = LinearFilter(0, False, [1.0], [1.0, 0.5])
assert lf.method_index() == 2
