matlab中ode45括号的意思,导数?function dy = vdp1000(t,y)dy = zeros(2,1); % a column vectordy(1) = y(2);dy(2) = 1000*(1 - y(1)^2)*y(2) - y(1);[t,Y] = ode15s(@vdp1000,[0 3000],[2 0])plot(t,Y(:,1),'-o')请问ode45中dy(1) ,y(2)等 括号是
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