[python-control-developers] [python-control/python-control] 564b1d: BugFix: allow straightforward creation of static g...

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

  Branch: refs/heads/master
  Home:   https://github.com/python-control/python-control
  Commit: 564b1dcc9e856e2e8958d1b108d04af5d97f70c0
      https://github.com/python-control/python-control/commit/564b1dcc9e856e2e8958d1b108d04af5d97f70c0
  Author: Rory Yorke <ror...@gm...>
  Date:   2016-12-28 (Wed, 28 Dec 2016)

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

  Log Message:
  -----------
  BugFix: allow straightforward creation of static gain StateSpace objects.

Allows StateSpace([],[],[],D), which failed previously.  Static gains
have sizes enforced as follows: A 0-by-0, B 0-by-ninputs, C
noutputs-by-0.

Tests added for instantiation, and sum, product, feedback, and appending,
of 1x1, 2x3, and 3x2 static gains StateSpace objects.


  Commit: 4a74cc559468256d179b9f72f0886208ff6b0771
      https://github.com/python-control/python-control/commit/4a74cc559468256d179b9f72f0886208ff6b0771
  Author: Rory Yorke <ror...@gm...>
  Date:   2016-12-28 (Wed, 28 Dec 2016)

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

  Log Message:
  -----------
  BugFix: fix Python 2.7 failure.

On Python 2.7, the special case "all states useless" in
_remove_useless_states resulted in A=[[0]] (and similarly for B and C).

The special case is no longer needed, since empty A, B, C matrices can
be handled.  numpy.delete does the right thing w.r.t. matrix
sizes (e.g., deleting all columns of a nxm matrix gives an nx0 matrix).

Added test for this.


  Commit: 09f9bab4e5d984dffc9215d2e8e80f2958873759
      https://github.com/python-control/python-control/commit/09f9bab4e5d984dffc9215d2e8e80f2958873759
  Author: Rory Yorke <ror...@gm...>
  Date:   2016-12-28 (Wed, 28 Dec 2016)

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

  Log Message:
  -----------
  BugFix: allow minreal on static gain StateSpace objects

Do this by only calling Slycot's tb01pd for non-static systems.


  Commit: c84debb49c14abe1df4c537ad42cc5e5a9fd75a3
      https://github.com/python-control/python-control/commit/c84debb49c14abe1df4c537ad42cc5e5a9fd75a3
  Author: Rory Yorke <ror...@gm...>
  Date:   2016-12-28 (Wed, 28 Dec 2016)

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

  Log Message:
  -----------
  BugFix: pole of stateless StateSpace object is empty array


  Commit: b6b9906b54e380584b1eb6a3baf89474264adb06
      https://github.com/python-control/python-control/commit/b6b9906b54e380584b1eb6a3baf89474264adb06
  Author: Scott C. Livingston <sli...@cd...>
  Date:   2016-12-28 (Wed, 28 Dec 2016)

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

  Log Message:
  -----------
  Merge pull request #110

https://github.com/python-control/python-control/pull/110

Changes are from branch `rory-ss-static-pole` of
https://github.com/roryyorke/python-control.git


  Commit: d8b07cb5406d936ebe50b77831e9db687d7005af
      https://github.com/python-control/python-control/commit/d8b07cb5406d936ebe50b77831e9db687d7005af
  Author: Scott C. Livingston <sli...@cd...>
  Date:   2016-12-28 (Wed, 28 Dec 2016)

  Changed paths:
    M control/statesp.py

  Log Message:
  -----------
  TRIV: Delete extra indentation

Remove extra 4 spaces to achieve correct alignment. Note that in this
case the extra indent did not affect block membership of the statement.
Cf. https://docs.python.org/3/reference/lexical_analysis.html#indentation


Compare: https://github.com/python-control/python-control/compare/c498d3d27a5d...d8b07cb5406d