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Catch specgram warnings during tests #7985

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Merged
merged 6 commits into from
Feb 6, 2017
Merged

Catch specgram warnings during tests #7985

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62ad55b
Increase data length of specgram() test to remove UserWarnings (fixes…
DietBru Jan 29, 2017
7893b7b
Added test to check if specgram() warning is raised if len(x)<=NFFT.
DietBru Jan 29, 2017
804ade1
Typo + code beautification
DietBru Jan 30, 2017
17c40aa
Test the case len(x) < NFFT for psd() to restore code coverage.
DietBru Jan 31, 2017
379d128
Make sure that warning is always triggered.
DietBru Feb 1, 2017
850bb2e
Restore code coverage (second attempt).
DietBru Feb 3, 2017
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Restore code coverage (second attempt).
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@DietBru
DietBru committed Feb 6, 2017
commit 850bb2eceff070c8ca1e4509c1cab50e839307e2
12 changes: 12 additions & 0 deletions 12 lib/matplotlib/tests/test_mlab.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1630,6 +1630,18 @@ def test_csd(self):
assert_allclose(fsp, freqs, atol=1e-06)
assert spec.shape == freqs.shape

def test_csd_padding(self):
"""Test zero padding of csd(). """
if self.NFFT_density is None: # for derived classes
return
sargs = dict(x=self.y, y=self.y+1, Fs=self.Fs, window=mlab.window_none,
sides=self.sides)

spec0, _ = mlab.csd(NFFT=self.NFFT_density, **sargs)
spec1, _ = mlab.csd(NFFT=self.NFFT_density*2, **sargs)
assert_almost_equal(np.sum(np.conjugate(spec0)*spec0).real,
np.sum(np.conjugate(spec1/2)*spec1/2).real)

def test_psd(self):
freqs = self.freqs_density
spec, fsp = mlab.psd(x=self.y,
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