scipy.signal.ss2zpk

scipy.signal.ss2zpk(A, B, C, D, input=0)

State-space representation to zero-pole-gain representation.

A, B, C, D defines a linear state-space system with p inputs, q outputs, and n state variables.

Parameters:

A : array_like

State (or system) matrix of shape (n, n)

B : array_like

Input matrix of shape (n, p)

C : array_like

Output matrix of shape (q, n)

D : array_like

Feedthrough (or feedforward) matrix of shape (q, p)

input : int, optional

For multiple-input systems, the index of the input to use.

Returns:

z, p : sequence

Zeros and poles.

k : float

System gain.