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Typo in mlab.cohere #10003

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#10004
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Typo in mlab.cohere#10003
#10004
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Release criticalFor bugs that make the library unusable (segfaults, incorrect plots, etc) and major regressions.status: confirmed bug
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v2.1.2
@duncanmmacleod

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@duncanmmacleod
duncanmmacleod
opened on Dec 14, 2017

There is a critical typo in mlab.cohere introduced by 1504540:

matplotlib/lib/matplotlib/mlab.py

Lines 1341 to 1347 in 49d5ced

Pxx, f = psd(x, NFFT, Fs, detrend, window, noverlap, pad_to, sides,
scale_by_freq)
Pyy, f = psd(y, NFFT, Fs, detrend, window, noverlap, pad_to, sides,
scale_by_freq)
Pxy, f = csd(x, y, NFFT, Fs, detrend, window, noverlap, pad_to, sides,
scale_by_freq)
Cxy = np.abs(Pxy) ** 2 / (Pxx * Pxy)

There is a critical typo in mlab.cohere, the final line should read:

    Cxy = np.abs(Pxy) ** 2 / (Pxx * Pyy)

[i.e. a single character change Pxy -> Pyy].

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