python-control / python-control / 120

94%

Pull #107

travis-ci

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.

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