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bugfix: scaling of windows with negative coefficients #22828

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bugfix: scaling of windows with negative coefficients #22828

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6 changes: 5 additions & 1 deletion lib/matplotlib/mlab.py
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Original file line number Diff line number Diff line change
Expand Up @@ -395,7 +395,11 @@ def _spectral_helper(x, y=None, NFFT=None, Fs=None, detrend_func=None,
elif mode == 'psd':
result = np.conj(result) * result
elif mode == 'magnitude':
result = np.abs(result) / np.abs(window).sum()
result = np.abs(result)
if np.iscomplexobj(window):
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I don't think you need to check for complex windows here.

result /= np.abs(window).sum()
else:
result /= np.asarray(window).sum()
elif mode == 'angle' or mode == 'phase':
# we unwrap the phase later to handle the onesided vs. twosided case
result = np.angle(result)
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