Matlab - convertir de matlab a scilab

function epidemia

beta=0.03;

gamma=2;

x0=100;

y0=20;

z0=10;

tmax=6;

[t,x]=ode45(@epi, [0 tmax], [x0,y0,z0]);

subplot(3,1,1), plot(t,x(:,1)),title('Susceptibles');

subplot(3,1,2), plot(t,x(:,2)),title('Infectados');

subplot(3,1,3), plot(t,x(:,3)),title('Recobrados');

    function dx=epi(t,x)

        dx=zeros(3,1);

        dx(1)=-beta*x(1)*x(2);

        dx(2)=+beta*x(1)*x(2)-gamma*x(2);

        dx(3)=+gamma*x(2);

    end

end