Simulink® Control Design™

setxu - Set states and inputs in operating points

Syntax

op_new=setxu(op_point,x,u)

Graphical Alternative

As an alternative to the setxu function, set states and inputs of operating points with the Simulink^® Control Design™ GUI. See Importing Operating Points for more information.

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.

Example

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

setlinio

update