Accessing workspace variables with parallel workers

I have a simulink model that I would like to run a number of times over a range of 2 different variables. In my simulink model I was using model callbacks to take the 2 random initial variables and calculate the initial conditions to some of my integrators but this wasn't working and now I am doing this in the for loops. However when I run the simulation it throws an error saying "Warning: Error in the simulation was caused by missing variable 'q_e2b0'. Set "TransferBaseWorkspaceVariables" option to "on" to fix the issue." I tried setting that in setModelParameters but that doesn't work either.

Below is a pseduo code of my script:

num_sims = length(phi_range)*length(theta_range);
simIn(1:num_sims) = Simulink.SimulationInput('SixDOFSimulink');
sim_itr = 1;
for i = 1:length(phi_range)
    for j = 1:length(theta_range)
        
        phi0 = phi_range(i);
        theta0 = theta_range(j);
        % do calculations %  
        
        pos0 = %value%
        v_b0 = %value%
        w0 = %value%
        q_e2b_0 = %value%
        
        simIn(sim_itr) = simIn(sim_itr).setModelParameter('SimulationMode', 'normal', ...
            'SaveTime', 'on', ...
            'SaveOutput', 'on');
        simIn(sim_itr) = simIn(sim_itr).setVariable('theta0', theta0, 'workspace', 'SixDOFSimulink');
        simIn(sim_itr) = simIn(sim_itr).setVariable('phi0', phi0, 'workspace', 'SixDOFSimunlink');
        simIn(sim_itr) = simIn(sim_itr).setVariable('q_e2b0', q_e2b0, 'workspace', 'SixDOFSimunlink');
        simIn(sim_itr) = simIn(sim_itr).setVariable('v_b0', v_b0, 'workspace', 'SixDOFSimunlink');
        simIn(sim_itr) = simIn(sim_itr).setVariable('pos0', pos0, 'workspace', 'SixDOFSimunlink');
        simIn(sim_itr) = simIn(sim_itr).setVariable('w0', w0, 'workspace', 'SixDOFSimunlink');
        sim_itr = sim_itr+1;
    end
end
out = parsim(simIn, 'ShowProgress', 'on');
delete(gcp('nocreate'))

[Paul]

Is the variable q_e2b_0 as specified prior to the simIn assignments, or is it q_e2b0 (w/o the second underbar) as in the third simIn assignment, (both for the variable name and the value)?

[George]

I did not notice that typo, but just to make sure, I included both of them in the setVariable definition, but this did not help. I still get this error. "Warning: Error in the simulation was caused by missing variable 'q_e2b0'. Set "TransferBaseWorkspaceVariables" option to "on" to fix the issue."

I tried adding TransferBaseWorkspaceVariables to the setModelParameters, but then I get this error from the output of each run: block_diagram does not have a parameter named 'TransferBaseWorkspaceVariables'

Answer 1

[Paul]

It sounds like q_e2b0 is supposed to be a base workspace variable that's not really a variable that's used in the simulation, like as a block parameter. Maybe q_e2b0 is used in an InitFcn callback or something similar (I'm only assuming that variables used an InitFcn don't get applied via setVariable).

Anyway, the TransferBaseWorkspaceVariables is a name/value directive in the parsim command, though the linked doc page suggests there might be better alternatives. And, of course, make sure the variable with the correct name is defined in the base workspace to be transferred.