Thematic example

[lheagy]

We should have a simple thematic example for the code that we write. I would suggest that we keep the software footprint small and rely only on numpy, scipy and matplotlib (plus dev requirements of pytest, sphinx)

What is an example that would be interesting and simple to test? We could go with a time-series analysis problem? Stack a signal, fourier transform and apply a filter, and transform back? (or even just one of those steps?)