system : an instance of the LTI class or a tuple describing the system.
The following gives the number of elements in the tuple and
2 (num, den)
3 (zeros, poles, gain)
4 (A, B, C, D)
T : 1D ndarray or array-like, optional
The time steps at which the input is defined and at which the
output is desired. If T is not given, the function will
generate a set of time samples automatically.
X0 : 1D ndarray or array-like, optional
The initial condition of the state vector. If X0 is None, the
initial conditions are assumed to be 0.
N : int, optional
Number of time points to compute. If N is not given, 100
points are used.
**kwargs : :
Additional keyword arguments are passed on the function
scipy.signal.lsim2, which in turn passes them on to
scipy.integrate.odeint. See the documentation for
scipy.integrate.odeint for information about these