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# scipy.signal.zpk2tf

`scipy.signal.``zpk2tf`(z, p, k)

  Return polynomial transfer function representation from zeros and poles

  Parameters: | z : array_like Zeros of the transfer function. p : array_like Poles of the transfer function. k : float System gain.
  Returns: | b : ndarray Numerator polynomial coefficients. a : ndarray Denominator polynomial coefficients.