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# scipy.signal.tf2ss

`scipy.signal.``tf2ss`(num, den)

  Transfer function to state-space representation.

  Parameters: | num, den : array_like Sequences representing the numerator and denominator polynomials. The denominator needs to be at least as long as the numerator.
  Returns: | A, B, C, D : ndarray State space representation of the system, in controller canonical form.