setxu - Set states and inputs in operating points

Syntax

Alternatives

As an alternative to the setxu function, set states and inputs of operating points with the Simulink Control Design GUI.

Description

op_new=setxu(op_point,x,u) sets the states and inputs in the operating point, op_point, with the values in x and u. A new operating point containing these values, op_new, is returned. The variable x can be a vector or a structure with the same format as those returned from a Simulink simulation. The variable u can be a vector. Both x and u can be extracted from another operating point object with the getxu function.

Examples

Open the Simulink model F14 by typing f14 at the command line. Select Simulation > Configuration Parameters > Data Import/Export. In the Save to workspace pane, select Final states. In the Save options pane, select Structure from Format. This selection saves the final states of the model to the workspace after a simulation.

Start the simulation. After it has run, a new variable, xFinal, should be in the workspace. This variable is a structure with two properties, time and signals.

Create an operating point object for F14 by typing:

op_point=operpoint('f14')

All states are initially set to 0. Set the states in this object to be the values in xFinal. Set the input to be 9.

newop=setxu(op_point,xFinal,9)

The new operating point is displayed as follows:

 Operating Point for the Model f14.
 (Time-Varying Components Evaluated at time t=0)

States: 
----------
(1.) f14/Actuator Model
      x: -0.032       
(2.) f14/Aircraft Dynamics Model/Transfer Fcn.1
      x: 0.56         
(3.) f14/Aircraft Dynamics Model/Transfer Fcn.2
      x: 678          
(4.) f14/Controller/Alpha-sensor Low-pass Filter
      x: 0.392        
(5.) f14/Controller/Pitch Rate Lead Filter
      x: 0.133        
(6.) f14/Controller/Proportional plus integral compensator
      x: 0.166        
(7.) f14/Controller/Stick Prefilter
      x: 0.1          
(8.) f14/Dryden Wind Gust Models/Q-gust model
      x: 0.114        
(9.) f14/Dryden Wind Gust Models/W-gust model
      x: 0.46         
      x: -2.05        
 
Inputs: 
-----------
(1.) f14/u
      u: 9            

See Also

getxu | initopspec | operpoint | operspec

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