Modeling SIR in matlab and simulink help needed

Hello, I am trying to model a SIR epidemic model in matlab and simulink. I think I've already done it in matlab but for some reason my simulink model won't work. It just shows straight lines in a scope. This is my function to calculate differential equations.

function dx = sir(t, x)
  dx = [0; 0; 0];
  beta = .5; 
  delta = .3;

    dx(1) = -beta * x(1) * x(2);
    dx(2) = beta * x(1) * x(2) - delta * x(2);
    dx(3) = delta * x(2);
  end

This is my workspace code to show plot

and this is mu simulink with yields this strange plot and this is after autoscaling with initial conditions set to S = 7900000 and R = 0 and I = 10

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[Alaa Mohamed]

I am working on the same model rightnow, but for some reason the plot code is not running, could you help me?

[MICHAEL Veneziano]

could it be that with an S many times greater than I, I seems 0? try running it for a longer time or witha greater I or beta

Answer 1

[CIRO ANTONIO MAMI]

Same problem here, did you find any solutions?