README, TODO shorten some names of functions on sub-modules
added common functions to continuous/__init__.py
wrote a code example of band pass filtering, implemented white noise
generator, added TODO to a visual test
README
README
added some design principles to README. layers in the API of
ContinuousData
separated some logic out of the fft function
removed option is_abs from plot, as it's logic
inserted plot method for signals. it works
adding label param to plot, and doing some refactoring there