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I want to use ode45 in matlab function(that is block of sumulink).

However, i cannot do it when i tried to use ode45　for solve second‐order differential equation.

Would you tell me how to use ode45 in matlab function?

i tried the following code.

function yout = fcn(u)

[t,y] = ode45(@vdp1,[0 20],[2; 0]);

yout = y(end,:);

end

function dydt = vdp1(t,y)

dydt = [y(2); (1-y(1)^2)*y(2)-y(1)];

end