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`ss`

format variables`a``b``c``d`- The usual state-space matrices. If a system has both
continuous and discrete states, they are sorted so that
continuous states come first, then discrete states
**Note**some functions (e.g.,`bode`

,`hinfsyn`

) will not accept systems with both discrete and continuous states/outputs `stname`- names of system states (list of strings)