.. currentmodule:: control

The classes listed below are used to represent models of linear time-invariant (LTI) systems. They are usually created from factory functions such as :func:`tf` and :func:`ss`, so the user should normally not need to instantiate these directly.

.. autosummary::
   :toctree: generated/

   ~lti.LTI
   FRD
   StateSpace
   TransferFunction