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function dy=rigid(t,y)
dy=zeros(5,1);
dy(1)=-0.002*y(1)*y(3)-0.008*y(1)*y(3);
dy(2)=0.008*y(1)*y(3)-0.003*y(2)*y(3)-0.2991*y(2);
dy(3)=0.002*y(1)*y(3)+0.003*y(2)*y(3)-y(3);
dy(4)=0.2991*y(2);
dy(5)=y(3);
ÔÚcommandÖбàд³ÌÐò£º
[T,Y]=ode45('rigid',[0 20],[1000 0 0 0 0 ]);
plot(t,y(:,1),'+',t,y(:,2),'.',t,y(:,3),'o',t,y(:,4),'s',T,y(:,5),'v')
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