scipy.signal.StateSpace

class scipy.signal.StateSpace(*system)

Linear Time Invariant system class in state-space form.

Represents the system as the first order differential equation \(\dot{x} = A x + B u\).

Parameters:

*system : arguments

The StateSpace class can be instantiated with 1 or 4 arguments. The following gives the number of input arguments and their interpretation:

• 1: lti system: (StateSpace, TransferFunction or ZerosPolesGain)
• 4: array_like: (A, B, C, D)

Notes

Changing the value of properties that are not part of the StateSpace system representation (such as zeros or poles) is very inefficient and may lead to numerical inaccuracies.

Attributes

A
B
C
D
den	Denominator of the TransferFunction system.
gain	Gain of the ZerosPolesGain system.
num	Numerator of the TransferFunction system.
poles	Poles of the ZerosPolesGain system.
zeros	Zeros of the ZerosPolesGain system.

Methods

bode([w, n])	Calculate Bode magnitude and phase data of a continuous-time system.
freqresp([w, n])	Calculate the frequency response of a continuous-time system.
impulse([X0, T, N])	Return the impulse response of a continuous-time system.
output(U, T[, X0])	Return the response of a continuous-time system to input U.
step([X0, T, N])	Return the step response of a continuous-time system.
to_ss()	Return a copy of the current StateSpace system.
to_tf(**kwargs)	Convert system representation to TransferFunction.
to_zpk(**kwargs)	Convert system representation to ZerosPolesGain.