8000 BUG : fix scaling issue with mlab.psd and odd NFFT by tacaswell · Pull Request #4326 · matplotlib/matplotlib · GitHub
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BUG : fix scaling issue with mlab.psd and odd NFFT #4326

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Merged
merged 2 commits into from
Apr 12, 2015
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BUG : fix scaling issue with mlab.psd and odd NFFT #4326

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17bc283
BUG : fix scaling issue with mlab.psd and odd NFFT
tacaswell Apr 10, 2015
01d2e6c
TST : add test of odd NFFT single sided psd
tacaswell Apr 12, 2015
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BUG : fix scaling issue with mlab.psd and odd NFFT 
closes #4324
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@tacaswell
tacaswell committed Apr 12, 2015
commit 17bc283f87b840a4644087c6cd04208e90fcc339
10 changes: 9 additions & 1 deletion lib/matplotlib/mlab.py
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Expand Up @@ -782,7 +782,15 @@ def _spectral_helper(x, y=None, NFFT=None, Fs=None, detrend_func=None,
# Also include scaling factors for one-sided densities and dividing by
# the sampling frequency, if desired. Scale everything, except the DC
# component and the NFFT/2 component:
result[1:-1] *= scaling_factor

# if we have a even number of frequencies, don't scale NFFT/2
if not NFFT % 2:
slc = slice(1, -1, None)
# if we have an odd number, just don't scale DC
else:
slc = slice(1, None, None)

result[slc] *= scaling_factor

# MATLAB divides by the sampling frequency so that density function
# has units of dB/Hz and can be integrated by the plotted frequency
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