there are some changes in default parameters for power spectral density
calculations in matplotlib.mlab.psd (and thus matplotlib.pyplot.psd,
too) with matplotlib version 0.98.4.
I wrote a wrapper in obspy.signal.psd.psd that -- regardless of
matplotlib version -- emulates the behavior of recent matplotlib
versions (scaling for onesided fft, scaling by sampling rate). I also
added tests to compare the results against PITSA.
For more information see:
(page will get updated overnight)