Matlab + Simulink Crash while running CarSim S Function in loop

Hello,

I am using CarSim S-Function in Simulink and calling it using Matlab command as written below:

            warning('off')
            K = lqr(A,B(:,2),Q,R);    
            beep off;
            
            simout = sim('model', 'SrcWorkspace','current');

This is in a loop which runs about 2000 - 5000 times (it is an optimization loop) to calculate fitness values from real-time simulation.

The program runs properly but randomly crashes after 100 - 200 iterations. I observed the crash and it occurs randomly during which Simulink and Matlab crash with no crash log or continue message. It just instantly closes along with simulink.

My Simulink .mdl model has no errors/warnings or algebraic loop warnings.

I have attached an image of my simulink block. Below is the complete code that is called to run in a loop

            function z = pfot(x, A, B, C, D)       

         
    Q = [   x(1) 0 0 0;
            0 x(2) 0 0;
            0 0 x(3) 0;
            0 0 0 x(4)];   
    
    R = 1;    
    

    
    %% Ensuring system is stable
    E = eig(Q);
    
    if all(E > 0)        
        try   
            
            
            warning('off')
            K = lqr(A,B(:,2),Q,R);    
            beep off;
            
            simout = sim('model', 'SrcWorkspace','current');             
            
            truckAcc = simout.Ay1.Data;
            traiAcc = simout.Ay2.Data;
            
            %Getting peak lateral acc
            peakAccTruck = max(abs(truckAcc));
            peackAccTrail = max(abs(traiAcc));    

            %rwa = info3.Max/info2.Max;
            rwa = peackAccTrail/peakAccTruck;            
            errorRWA = abs(1 - rwa);
            
            %PFOT Using Target
            targetX = simout.xTarget.Data;
            targetY = simout.yTarget.Data;
            trailerX = simout.Xo2.Data;
            trailerY = simout.Yo2.Data;            
            PFOTX = abs(sum(targetX - trailerX));
            PFOTY = abs(sum(targetY - trailerY));
            PFOT = (PFOTX+PFOTY)/2;
            
            if (errorRWA > 2)% || peackAccTrail > 0.65 || peakAccTruck > 0.65 )
                z = [inf inf]';               
            else
                z = [errorRWA PFOT]';
            end

        catch
            z = [inf inf]';
        end

    else
        z = [inf inf]';
    end    
    
    
end

[Vineeth Nair]

In the block diagram atatched, a Gain block with K*u value can be seen. Its marked in red, which possibly denotes an error. Can you open it and check what the error message is

[Khizar Qureshi]

Hey Vineeth,

Thank you for your response. The K*u block is red as it needs a value from the matlab file. When I fun it it is fine. I took the screenshot without running it