How do I tune a parameter in an accelerated model reference while the simulation is running?

I have a parameter in a model reference that I would like to tune while the simulation is running in accelerator mode. How do I do this?

Answer 1

[MathWorks Support Team]

There are many ways to tune a parameter in accelerated model reference while the simulation is running. Consider the following model and model reference.

Tune with Simulation Object (24a and later)

The easiest way to tune a parameter while simulating is to use the Simulation Object introduced in 24a.

Control simulation execution and tune variable, block parameter, and model parameter values - MATLAB (mathworks.com)

set_param(mdl,'SimulationMode','acc')
sl = simulation('model');
gainRM = 1;
sl.start
pause(1)
sl.setVariable('gainRM',2)
pause(1)
sl.stop;
sl.SimulationOutput.yout{1}.Values.Data(end) %should be 2

Tune in Normal Mode (No Update)

In normal mode you can tune the variable directly if you use set_param and it will work.

set_param(mdl,'SimulationMode','normal')
gainRM = 1;
set_param(mdl,'SimulationCommand','start');
pause(1)
gainRM = 2;
set_param('Ref_Mod/Constant','Value','gainRM');
pause(1);
set_param(mdl,'SimulationCommand','stop');
out.yout{1}.Values.Data(end) %should be 2

Tune in Accel Mode (With Update)

In accelerator mode, you need to trigger an update for the change to propagate.

set_param(mdl,'SimulationMode','acc')
gainRM = 1;
set_param(mdl,'SimulationCommand','start');
pause(1)
gainRM = 2;
set_param(mdl,'SimulationCommand','update');
pause(1);
set_param(mdl,'SimulationCommand','stop');
out.yout{1}.Values.Data(end) %should be 2

Tune in Accel Mode (With Model Arguments)

If you do not want to trigger an update, make the parameter a model then you do not need to trigger an update.

Parameterize Instances of a Reusable Referenced Model - MATLAB & Simulink (mathworks.com)

set_param(mdl,'SimulationMode','acc')
gainRM = 1;
set_param(mdl,'SimulationCommand','start');
pause(1)
gainRM = 2;
instSpecParams = get_param('model/Model1','InstanceParameters');
set_param('model/Model1','InstanceParameters',instSpecParams);
pause(1);
set_param(mdl,'SimulationCommand','stop');
out.yout{2}.Values.Data(end) %should be 2