[python-control-developers] [python-control/python-control] 7bed77: TransferFunction _common_den rewrite - issue #194 ...

[Rene v. P. <ren...@gm...>]

  Branch: refs/heads/master
  Home:   https://github.com/python-control/python-control
  Commit: 7bed77f2526dc5b9fde4870e035b7a64a3e81448
      https://github.com/python-control/python-control/commit/7bed77f2526dc5b9fde4870e035b7a64a3e81448
  Author: Rene van Paassen <ren...@gm...>
  Date:   2018-07-01 (Sun, 01 Jul 2018)

  Changed paths:
    M control/statesp.py
    M control/tests/convert_test.py
    M control/tests/discrete_test.py
    M control/tests/matlab_test.py
    M control/tests/xferfcn_test.py
    M control/xferfcn.py

  Log Message:
  -----------
  TransferFunction _common_den rewrite - issue #194 (#206)

* replaced the _common_den function internals. Passes tests
* make xferfcn.py python2 compatible again
* working tf -> ss transformation now, also solved #111
* disabled MIMO test when no slycot
* do not cancel pole/zero pairs before calculating pole() in xferfcn.py
- for the above reason, do conversion on minreal'd xferfcn in statesp.py
- add a test for not canceling pole/zero pairs when calculating pole()
- add import of matlab in discrete_test.py
* change testModred; that one did state removal on a system of which the selection of states was automatic



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