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Showing content from https://python-control.readthedocs.io/en/stable/generated/control.ss2tf.html below:

control.ss2tf(sys)[source]

Transform a state space system to a transfer function.

The function accepts either 1 or 4 parameters:

ss2tf(sys)

Convert a linear system from state space into transfer function form. Always creates a new system.

ss2tf(A, B, C, D)

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

For details see: tf.

Parameters:

sysStateSpace: A linear system.
Aarray_like or string: System matrix.
Barray_like or string: Control matrix.
Carray_like or string: Output matrix.
Darray_like or string: Feedthrough matrix.
**kwargskeyword arguments: Additional arguments passed to tf (e.g., signal names).

Returns:

Other Parameters:

inputs, outputsstr, or list of str, optional: List of strings that name the individual signals of the transformed system. If not given, the inputs and outputs are the same as the original system.
namestring, optional: System name. If unspecified, a generic name ‘sys[id]’ is generated with a unique integer id.

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.

Examples

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

>>> sys_ss = ct.ss(A, B, C, D)
>>> sys_tf = ct.ss2tf(sys_ss)

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