Simulink - Rapid Accelerator with varying inputs

Hello,

I am running my Simulink model 'MyModel' -times in a script (let's call it 'MyScript.m') as it can be seen below. The goal is to build the model in rapid accelerator mode outside of the for-loops and then run the model -times with varying inputs. My Simulink 'MyModel' has 5 root level inputs with a fixed sampling time. The signals 'signal1' - 'signal5' are double workspace variables.

When running the script, I get the following:

Building the rapid accelerator target for model: MyModel

Successfully built the rapid accelerator target for model: MyModel

Error using MyScript (line 25) [Error occurs in the line with the 'sim' command]

In 'Simulink:Logging:UTInvDim', parameter {1} must be a real scalar.

I know that it is probably difficult to solve this problem without having access to the Simulink model. However, maybe someone can tell me if this the right way to run a Simulink model in rapid accelerator mode with varying inputs in general.

model = 'MyModel';

% Build rapid accelerator target
rtp = Simulink.BlockDiagram.buildRapidAcceleratorTarget(model);

% Create simulation object
sim_object = Simulink.SimulationInput(model);

% Set model parameters
sim_object = sim_object.setModelParameter('SimulationMode','rapid','StartTime','0','ReturnWorkspaceOutputs','on');

for i = 1:N
    for ii = 1:M
        % Set stop time
        sim_object = sim_object.setModelParameter('StopTime','1');
        
        % Set input signals of 'MyModel'
        sim_object = sim_object.setExternalInput(signal1);
        sim_object = sim_object.setExternalInput(signal2);
        sim_object = sim_object.setExternalInput(signal3);
        sim_object = sim_object.setExternalInput(signal4);
        sim_object = sim_object.setExternalInput(signal5);
        
        % Start simulation
        sim(sim_object)
    end
end

Answer 1

[nick]

Hi TeichEnterich95,

The error you're encountering suggests an issue with how inputs are being set up and passed to the model. The 'setExternalInput' function should be used to specify all inputs using a single variable, as shown:

% Loop over N and M
for i = 1:N
    for ii = 1:M
        % Set stop time
        sim_object = sim_object.setModelParameter('StopTime','1');
        
        % Assuming signal1, signal2, ..., signal5 are time series with the same time vector
        timeVector = signal1.Time;  

        % Concatenate signals into a single matrix
        inputData = [timeVector, signal1.Data, signal2.Data, signal3.Data, signal4.Data, signal5.Data];

      
        sim_object = sim_object.setExternalInput(inputData);
        
        simOut = sim(sim_object);
      
    end
end

You may refer to the following documentation to know more about 'setExternalInput' function:

https://www.mathworks.com/help/releases/R2021a/simulink/slref/setexternalinput.html

I hope this helps!