# 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.

scipy.signal.tf2ss scipy.signal.zpk2sos