[python-control-developers] [python-control/python-control] 500515: implement __repr__ for tf, ss, and frd (#416)

[Rene v. P. <no...@gi...>]

  Branch: refs/heads/master
  Home:   https://github.com/python-control/python-control
  Commit: 50051594f81c8a048d1f19180ec9ac0b645f68a5
      https://github.com/python-control/python-control/commit/50051594f81c8a048d1f19180ec9ac0b645f68a5
  Author: Rene van Paassen <ren...@gm...>
  Date:   2020-07-11 (Sat, 11 Jul 2020)

  Changed paths:
    M control/frdata.py
    M control/statesp.py
    M control/tests/frd_test.py
    M control/tests/statesp_test.py
    M control/tests/xferfcn_test.py
    M control/xferfcn.py

  Log Message:
  -----------
  implement __repr__ for tf, ss, and frd (#416)

* implement __repr__ for tf, ss, and frd

* use np.matmul for compatibility with python 2.7