scipy tutorial - Baustatik-Info-Server

SciPy Reference Guide, Release 0.8.dev
Parameters
z : ndarray
zeros of the transfer function.
p : ndarray
k : float
poles of the transfer function.
system gain.
Returns
b : ndarray
numerator polynomial.
a : ndarray
numerator and denominator polynomials.
tf2ss(num, den)
Transfer function to state-space representation.
Inputs:
Outputs:
num, den – sequences representing the numerator and denominator polynomials.
A, B, C, D – state space representation of the system.
ss2tf(A, B, C, D, input=0)
State-space to transfer function.
Inputs:
Outputs:
A, B, C, D – state-space representation of linear system. input – For multiple-input systems, the
input to use.
num, den – Numerator and denominator polynomials (as sequences)
respectively.
zpk2ss(z, p, k)
Zero-pole-gain representation to state-space representation
Inputs:
Outputs:
z, p, k – zeros, poles (sequences), and gain of system
A, B, C, D – state-space matrices.
ss2zpk(A, B, C, D, input=0)
State-space representation to zero-pole-gain representation.
Inputs:
Outputs:
A, B, C, D – state-space matrices. input – for multiple-input systems, the input to use.
z, p, k – zeros and poles in sequences and gain constant.
344 Chapter 3. Reference