Frequency response open_loop=True not really open loop
Summary
The FrequencyResponse
open_loop option doesn't always compute the open loop properly. It only really works in SISO cases. In MIMO cases it is just trying to open one loop at a time and doesn't return the proper MIMO open loop transfer function matrix.
Possible Fixes
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Change name of open_loop
option -
Should be documented, part of #582 in that regard the LTI features need more documenting -
Add options to automatically detect signal loops, break them, then compute the frequency response.