#### Previous topic

scipy.signal.ss2tf

#### Next topic

scipy.signal.sos2zpk

# 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.