### Navigation

- index
- modules |
- modules |
- next |
- previous |
- SciPy v0.12 Reference Guide (DRAFT) »
- Signal processing (`scipy.signal`) »

# 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 Denominator polynomial.
  Returns : | z : ndarray Zeros of the transfer function. p : ndarray Poles of the transfer function. k : float System gain.

  Notes

  If some values of b are too close to 0, they are removed. In that case, a BadCoefficients warning is emitted.

### Navigation

- index
- modules |
- modules |
- next |
- previous |
- SciPy v0.12 Reference Guide (DRAFT) »
- Signal processing (`scipy.signal`) »