Sincerootlocus_pid_designer leaves eitherr ord disconnected, theinterconnect function was generating warnings (76 of them...). This was fixed by usingcheck_unused=False.
Callingrootlocus_pid_designer withplot=True seems to generate a Bode plot that is -1 and this creates a warning:

control/ctrlutil.py:75: RuntimeWarning: invalid value encountered in remainder  dangle_desired = (dangle + period/2.) % period - period/2.

For now this latter problem is fixed by skipping this test.

@sawyerbfuller I'm not quite sure how to fix this error. If I try running the test by hand using

ct.rootlocus_pid_designer(syscont, input_signal='r', Kp0=0.01,    derivative_in_feedback_path=True, gain='P')

then I get the following plot:

murrayrm added2 commits

fix warning messages in pid_designer

674f6f6

skip rootlocus_pid_designer tests that are generating warnings

7cfa42a

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Coverage decreased (-0.2%) to 93.383% when pulling7cfa42a on murrayrm:fix_pid_designer_warnings into8356044 on python-control:master.

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Merging this for 0.9.1, but will create an issue to track the possible bug above.

murrayrm merged commitb78dcc4 intopython-control:master

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