[python-control-developers] [python-control/python-control] 72262c: preliminary version of lqe function

[sawyerbfuller <no...@gi...>]

  Branch: refs/heads/master
  Home:   https://github.com/python-control/python-control
  Commit: 72262c65749d1a15e58680f3ba6efc4842a0448f
      https://github.com/python-control/python-control/commit/72262c65749d1a15e58680f3ba6efc4842a0448f
  Author: sawyerbfuller <587...@us...>
  Date:   2019-12-30 (Mon, 30 Dec 2019)

  Changed paths:
    M control/statefbk.py
    M control/tests/statefbk_test.py

  Log Message:
  -----------
  preliminary version of lqe function

* added preliminary version of lqe function, which calculates the gain for a steady-state Kalman filter.
* LQE: added python 2 compatibility and unit test