xperm - Reorder states in state-space models
Syntax
sys = xperm(sys,P)
Description
sys = xperm(sys,P) reorders the states
of the state-space model sys according to the permutation P.
The vector P is a permutation of 1:NX,
where NX is the number of states in sys.
For information about creating state-space models, see ss and dss.
Example
Order the states in the ssF8 model in alphabetical
order.
Load the ssF8 model by typing the following commands:
load ltiexamples
ssF8
These commands return:
a =
PitchRate Velocity AOA PitchAngle
PitchRate -0.7 -0.0458 -12.2 0
Velocity 0 -0.014 -0.2904 -0.562
AOA 1 -0.0057 -1.4 0
PitchAngle 1 0 0 0
b =
Elevator Flaperon
PitchRate -19.1 -3.1
Velocity -0.0119 -0.0096
AOA -0.14 -0.72
PitchAngle 0 0
c =
PitchRate Velocity AOA PitchAngle
FlightPath 0 0 -1 1
Acceleration 0 0 0.733 0
d =
Elevator Flaperon
FlightPath 0 0
Acceleration 0.0768 0.1134
Continuous-time model.Order the states in alphabetical order by typing the
following commands:
[y,P]=sort(ssF8.StateName);
sys=xperm(ssF8,P)
These commands return:
a =
AOA PitchAngle PitchRate Velocity
AOA -1.4 0 1 -0.0057
PitchAngle 0 0 1 0
PitchRate -12.2 0 -0.7 -0.0458
Velocity -0.2904 -0.562 0 -0.014
b =
Elevator Flaperon
AOA -0.14 -0.72
PitchAngle 0 0
PitchRate -19.1 -3.1
Velocity -0.0119 -0.0096
c =
AOA PitchAngle PitchRate Velocity
FlightPath -1 1 0 0
Acceleration 0.733 0 0 0
d =
Elevator Flaperon
FlightPath 0 0
Acceleration 0.0768 0.1134
Continuous-time model.The states in ssF8 now
appear in alphabetical order.
See Also
ss, dss
 | upsample | | zero |  |
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