[python-control-developers] [python-control/python-control] 310f58: BugFix: DC gain for discrete-time systems

[Scott C. L. <sli...@us...>]

  Branch: refs/heads/master
  Home:   https://github.com/python-control/python-control
  Commit: 310f5805f0fd51aa9e1191aaf3083d483421695d
      https://github.com/python-control/python-control/commit/310f5805f0fd51aa9e1191aaf3083d483421695d
  Author: Rory Yorke <ror...@gm...>
  Date:   2017-01-04 (Wed, 04 Jan 2017)

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

  Log Message:
  -----------
  BugFix: DC gain for discrete-time systems

For discrete time systems the DC gain is found at z=1; change dcgain
method in TransferFunction and StateSpace classes for this.

Added tests for static gain, low-pass filter, differencer and
summer for both classes.

If the StateSpace DC gain computation fails due to singularity, return
an array of NaNs of size (output,input), rather than scalar NaN.  Added
separate test for this for continuous- and discrete-time cases.


  Commit: 78a03c22db012f1ba3acbb51c44d48eb725b5e6c
      https://github.com/python-control/python-control/commit/78a03c22db012f1ba3acbb51c44d48eb725b5e6c
  Author: Scott C. Livingston <sli...@us...>
  Date:   2017-01-05 (Thu, 05 Jan 2017)

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

  Log Message:
  -----------
  Merge pull request #126 from roryyorke/rory/discr-time-dcgain-fix

BugFix: DC gain for discrete-time systems


Compare: https://github.com/python-control/python-control/compare/32f13bcdf32f...78a03c22db01