[python-control-developers] [python-control/python-control] 8a11cd: Add 's' and 'z' variable support to tf() (#304)

[Richard M. <no...@gi...>]

  Branch: refs/heads/master
  Home:   https://github.com/python-control/python-control
  Commit: 8a11cd3688bd223058464c12010ac443d8e4f41d
      https://github.com/python-control/python-control/commit/8a11cd3688bd223058464c12010ac443d8e4f41d
  Author: Richard Murray <mu...@cd...>
  Date:   2019-05-31 (Fri, 31 May 2019)

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

  Log Message:
  -----------
  Add 's' and 'z' variable support to tf() (#304)