control.ss2tf

control.ss2tf(*args)

Transform a state space system to a transfer function.

The function accepts either 1 or 4 parameters:

ss2tf(sys)

Convert a linear system into space system form. Always creates a new system, even if sys is already a StateSpace object.

ss2tf(A, B, C, D)

Create a state space system from the matrices of its state and output equations.

For details see: ss()

Parameters:

sys: StateSpace

A linear system

A: array_like or string

System matrix

B: array_like or string

Control matrix

C: array_like or string

Output matrix

D: array_like or string

Feedthrough matrix

Returns:

out: TransferFunction

New linear system in transfer function form

Raises:

ValueError

if matrix sizes are not self-consistent, or if an invalid number of arguments is passed in

TypeError

if sys is not a StateSpace object

See also

tf, ss, tf2ss

Examples

>>> A = [[1., -2], [3, -4]]
>>> B = [[5.], [7]]
>>> C = [[6., 8]]
>>> D = [[9.]]
>>> sys1 = ss2tf(A, B, C, D)

>>> sys_ss = ss(A, B, C, D)
>>> sys2 = ss2tf(sys_ss)