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# scipy.signal.zpk2tf

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

  Return polynomial transfer function representation from zeros and poles

  Parameters: | z : ndarray zeros of the transfer function. p : ndarray poles of the transfer function. k : float system gain.
  Returns: | b : ndarray numerator polynomial. a : ndarray numerator and denominator polynomials.

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