bode plot optimal frequency grid selection

[ilayn]

matlab's 4 level of granularity is not optimal for freqresp computation. The scheme that harold implements is quite better but that is also not optimal. Especially when two points of interest are close to each other it doesn't handle well the distinction.

Currently it works as finding the region of interest and increasing the level of detail around the poles and zeros.

This is a pretty academic problem and I'll see if I can convert it to a conference paper. Since we have bokeh based interactive plots, the complexity ~O(n^2+n) is still too expensive. I need to find a way to reduce it further.

If someone has a good implementation with proper analysis of the complexity, I'm all ears.

[ilayn]

Some progress has been made. Instead of bokeh, matplotlib is the default backend. But frequency points reduced significantly (for simple plants around 80 points) without giving away too much from visual smoothness. Will be polished before v.0.1.1 is out.

[astrojuanlu]

Awesome! Looking forward to the release :)