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# scipy.signal.tf2zpk

`scipy.signal.``tf2zpk`(b, a)

  Return zero, pole, gain (z,p,k) representation from a numerator, denominator representation of a linear filter.

  Parameters : | b : ndarray numerator polynomial. a : ndarray numerator and denominator polynomials.
  Returns : | z : ndarray Zeros of the transfer function. p : ndarray Poles of the transfer function. k : float System gain. If some values of b are too close to 0, they are removed. In that case, a : BadCoefficients warning is emitted. :

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