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TST: test mlab cohere #10019

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Dec 18, 2017
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TST: test mlab cohere #10019

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14 changes: 14 additions & 0 deletions lib/matplotlib/tests/test_mlab.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2136,6 +2136,20 @@ def test_psd_windowarray_equal(self):
assert_allclose(speca, specb, atol=1e-08)


# extra test for cohere...
def test_cohere():
N = 1024
np.random.seed(19680801)
x = np.random.randn(N)
# phase offset
y = np.roll(x, 20)
# high-freq roll-off
y = np.convolve(y, np.ones(20) / 20., mode='same')
cohsq, f = mlab.cohere(x, y, NFFT=256, Fs=2, noverlap=128)
assert_allclose(np.mean(cohsq), 0.837, atol=1.e-3)
assert np.isreal(np.mean(cohsq))


def test_griddata_linear():
# z is a linear function of x and y.
def get_z(x, y):
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