[python-control-developers] [python-control/python-control] 3b19ae: Fix plot issues (#382)

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

  Branch: refs/heads/master
  Home:   https://github.com/python-control/python-control
  Commit: 3b19ae93d3403b5cc6460ab4d34d30a07e1c67f2
      https://github.com/python-control/python-control/commit/3b19ae93d3403b5cc6460ab4d34d30a07e1c67f2
  Author: Richard Murray <mu...@cd...>
  Date:   2020-03-24 (Tue, 24 Mar 2020)

  Changed paths:
    M control/config.py
    M control/freqplot.py
    M control/grid.py
    M control/nichols.py
    M control/pzmap.py
    M control/rlocus.py
    M control/statesp.py
    M control/tests/config_test.py
    M control/tests/convert_test.py
    M control/tests/matlab_test.py
    M control/tests/rlocus_test.py
    M control/tests/slycot_convert_test.py
    M examples/pvtol-nested.py

  Log Message:
  -----------
  Fix plot issues (#382)

* fix sgrid, zgrid to use existing axes if they exist + PEP8 cleanup

* change plot and print_gain keywords to lower case, with deprecation warning + fix bugs in gangof4 using dB + PEP8, docstring cleanup

* remove conversion to state space that was giving spurious zero at infinity

* change plot and print_gain keywords to lower case, with deprecation warning

* PEP8 cleanup

* use Hz=False for MATLAB + docstring corrections

* labelFreq -> label_freq in nyquist_plot() w/ deprecation warning + remove extraneous docstring text