User`s guide

5 Model Analysis Tools
5-20
Model Order Reduction
You can derive reduced-order models with the following commands.
Use
minreal to delete uncontrollable or unobservable state dynamics in
state-space models, or cancel pole/zero pairs in transfer functions or
zero-pole-gain models. Use
sminreal to remove any s tates from a model that
don’t affect the I/O response. For already minima l models, you can further
reduce the model order using a combination of
balreal and modred.Seethe
corresponding Reference pages for details.
Model Order Reduction
balreal
Input/output balancing.
minreal
Minimal realization or pole/zero cancellation.
modred
State deletion in I/O balanced realization.
sminreal
Structurally minimal realizatio n