Initialize operating point specification values
opnew = initopspec(opspec,oppoint)
opnew = initopspec(opspec,x,u)
opnew = initopspec(opspec,xstruct,u)
opnew = initopspec(opspec,oppoint) initializes the
operating point specification object, opspec, with the values
contained in the operating point object, oppoint. The function
returns a new operating point specification object, opnew.
Create opspec with the function operspec.
Create oppoint with the function operpoint
or findop.
opnew = initopspec(opspec,x,u) initializes the operating
point specification object, opspec, with the values contained
in the state vector, x, and the input vector,
u. The function returns a new operating point
specification object, opnew. Create opspec
with the function operspec. You can use the function
getxu to create x and
u with the correct ordering.
opnew = initopspec(opspec,xstruct,u) initializes the
operating point specification object, opspec, with the values
contained in the state structure, xstruct, and the input
vector, u. The function returns a new operating point
specification object, opnew. Create opspec
with the function operspec. You can use the function
getstatestruct or getxu to create
xstruct and the function getxu to
create u with the correct ordering. Alternatively, you can save
xstruct to the MATLAB® workspace after a simulation of the model. See the Simulink® documentation for more information on these structures.
Create an operating point using findop by
simulating the magball model and extracting the
operating point after 20 time units.
oppoint=findop('magball',20)
This syntax returns the following operating point:
Operating Point for the Model magball.
(Time-Varying Components Evaluated at time t=20)
States:
----------
(1.) magball/Controller/PID Controller/Filter
x: 2.33e-007
(2.) magball/Controller/PID Controller/Integrator
x: 14
(3.) magball/Magnetic Ball Plant/Current
x: 7
(4.) magball/Magnetic Ball Plant/dhdt
x: 3.6e-008
(5.) magball/Magnetic Ball Plant/height
x: 0.05
Inputs: None
----------
Use these operating point values as initial values in an operating point specification object.
opspec=operspec('magball');
newopspec=initopspec(opspec,oppoint)
The new operating point specification object is displayed.
Operating Specification for the Model magball.
(Time-Varying Components Evaluated at time t=0)
States:
----------
(1.) magball/Controller/PID Controller/Filter
spec: dx = 0, initial guess: 2.33e-007
(2.) magball/Controller/PID Controller/Integrator
spec: dx = 0, initial guess: 14
(3.) magball/Magnetic Ball Plant/Current
spec: dx = 0, initial guess: 7
(4.) magball/Magnetic Ball Plant/dhdt
spec: dx = 0, initial guess: 3.6e-008
(5.) magball/Magnetic Ball Plant/height
spec: dx = 0, initial guess: 0.05
Inputs: None
----------
Outputs: None
----------You can now use this object to find operating points by optimization.
As an alternative to the initopspec function, initialize operating point
specification values in the Model Linearizer. See Import and Export Specifications for Operating Point Search.
findop | getstatestruct | getxu | operpoint | operspec