scipy.signal.
zpk2tf#
- scipy.signal.zpk2tf(z, p, k)[source]#
- Return polynomial transfer function representation from zeros and poles - Parameters:
- zarray_like
- Zeros of the transfer function. 
- parray_like
- Poles of the transfer function. 
- kfloat
- System gain. 
 
- Returns:
- bndarray
- Numerator polynomial coefficients. 
- andarray
- Denominator polynomial coefficients. 
 
 - Examples - Find the polynomial representation of a transfer function H(s) using its ‘zpk’ (Zero-Pole-Gain) representation. \[H(z) = 5 \frac { (s - 2)(s - 6) } { (s - 1)(s - 8) }\]- >>> from scipy.signal import zpk2tf >>> z = [2, 6] >>> p = [1, 8] >>> k = 5 >>> zpk2tf(z, p, k) ( array([ 5., -40., 60.]), array([ 1., -9., 8.]))