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#### 31.1.4 `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)