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# scipy.signal.ss2tf

`scipy.signal.``ss2tf`(A, B, C, D, input=0)

  State-space to transfer function.

  Parameters: | A, B, C, D : ndarray State-space representation of linear system. input : int, optional For multiple-input systems, the input to use.
  Returns: | num : 2-D ndarray Numerator(s) of the resulting transfer function(s). num has one row for each of the system’s outputs. Each row is a sequence representation of the numerator polynomial. den : 1-D ndarray Denominator of the resulting transfer function(s). den is a sequence representation of the denominator polynomial.