matlab解微分方程为什么老提示未定义的 t>> dydt = odefun(t,y)function dydt = vdp1000(t,y)dydt = [y(2); 1000*(1-y(1)^2)*y(2)-y(1)];[t,y] = ode15s(@vdp1000,[0 3000],[2; 0]);plot(t,y(:,1),'-');title('Solution of van der Pol Equation,\mu = 1
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