Load variables into a simulink model from a Matlab funtion.

Hello,

I am working in a project which needs to execute a Simulink model from a MATLAB Function. My problem is when I try to convert a standard script to a MATLAB function. In the places of the parameters, I put the same variable names in Simulink and in the MATLAB function... So, when I execute the function, in the workspace must be a variable with the name and value... but I get this message:

I am looking the way to save the parameters of the function as base workspace variables to be load in the model... My idea is the like this:

%As example (I'm working with simscape) in the parameter of a resistor I put R1 like the picture above:

function [out] = myFunction(R1) 
    %start of the function
    load_system('myCircuit');
    find_system('Name','myCircuit');
    %Run simulink model
    sim('myCircuit.slx');
    %dataOut
    out = ans.A;
    %end of the function

I tried the "setparam()" before the simulation to, without any result...

Thank you for reading,

Carlos

Answer 1

[Paul]

Check out the doc page for the sim() command

doc sim

The sim() command has some options that do what you want, including the SrcWorkspace Name/value paraemeter and the SimIn object.

Also, consider using the output of the sim() command to keep eveyrthing nice and tidy after the simulation completes

out = sim('myCircuit', ...)

[Carlos Jiménez Guerra]

Thank you Paul. I looked the documentation, and try the Name-Value parameter without any results... I'm sorry I can't share the code...

This is part of the code:

simOut = sim('myCircuit.slx', R1, Res1, R2, Res2);
% Where R is the parameter in the model 
% and Res de parameter in the function

And this the Error:

Error using myCircuit (line 63)
The "OPTIONS" parameter must be a structure created by SIMSET

I really do not know how to use this option: https://es.mathworks.com/help/simulink/slref/sim.html?searchHighlight=simset&s_tid=srchtitle#d123e310432

[Paul]

I assume that R1, Res1, etc. are block parameters in your model. In this case, make sure these variables have valued inside myFunction prior to the call to sim(). Then the sim command would look like:

simOut = sim('myCircuit','SrcWorkspace','current')

However, there are some caveats with this approach as discussed on the doc page for sim(), which might or might not apply to your model.

[Carlos Jiménez Guerra]

That works! Thank you.