scipy.fftpack.diff operation question
We are looking to plot to time series accelerometer data as velocity and displacement. To this end we tried scipy.fftpack.diff, but in looking at the test code direct_diff() we get odd results, and, why is the doc using "sqrt(-1)*j" in its explanation? So, I tried a few different integration methods. We were first looking at the doc at http://docs.scipy.org/doc/scipy-0.15.1/reference/generated/scipy.fftpack.dif... and code at https://github.com/scipy/scipy/blob/v0.15.1/scipy/fftpack/pseudo_diffs.py#L2... as well as the tests at https://github.com/scipy/scipy/blob/master/benchmarks/benchmarks/fftpack_pse... The direct_diff() test function in bench_pseudo_diffs.py seems odd, since I have to pass period=-1 to get a matching sign plot for the first integration. And why the scaling differences required, even for diff() and direct_diff()? Is my understanding fundamentally flawed? Emacs! Ray
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R Schumacher