def test_cos(self):
"""Test cosine wave."""
amp = 0.5
period = 5
freq = 1 / period
samples = 101
times = np.linspace(0, 10, samples)
cos_arr = continuous.cos(times, amp=amp, freq=freq)
# with new phase
cos_arr_phased = continuous.cos(times,
amp=amp,
freq=freq,
phase=np.pi / 2)
self.assertEqual(cos_arr.dtype, np.complex_)
# Assert starts at 1
self.assertAlmostEqual(cos_arr[0], amp)
self.assertAlmostEqual(cos_arr[6], 0.3644, places=2)
self.assertAlmostEqual(cos_arr[25], -amp)
self.assertAlmostEqual(cos_arr[50], amp)
self.assertAlmostEqual(cos_arr_phased[0], 0.0)
# Assert bounded between -amp and amp
self.assertTrue(np.all((-amp <= cos_arr) & (cos_arr <= amp)))
self.assertEqual(len(cos_arr), samples)
def test_cos(self):
"""Test discrete sampled cosine wave."""
amp = 0.5
period = 5
freq = 1/period
duration = 10
times = np.arange(0, duration) + 0.5
cos_ref = continuous.cos(times, amp=amp, freq=freq)
cos_pulse = library.cos(duration, amp=amp, freq=freq)
self.assertIsInstance(cos_pulse, Waveform)
np.testing.assert_array_almost_equal(cos_pulse.samples, cos_ref)
# test single cycle
cycle_freq = 1/duration
cos_cycle_ref = continuous.cos(times, amp=amp, freq=cycle_freq)
cos_cycle_pulse = library.cos(duration, amp=amp)
np.testing.assert_array_almost_equal(cos_cycle_pulse.samples, cos_cycle_ref)
