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.