function dx=paper3 (t,x)
dx=[-(x(2)+x(3));
x(1)+0.2*x(2);
0.2+(x(1)-5.7)*x(3)];
%%%%%%%%%%%%%%%%%%%%%%%%%%
x0=[0.1; 0.1; 0.035];
[t,y]=ode45('paper3',[0,200],x0);
for i=1:3
figure(i)
plot(t,y(:,i))
end
figure(4)
plot(y(:,1),y(:,2))
xlabel(‘t’)
ylabel(‘{u_1(t)})
%%%%%给x轴y轴标坐标
figure(5)
plot(y(:,1),y(:,3))
figure(6)
plot(y(:,2),y(:,3))
figure(7)
plot3(y(:,1),y(:,2),y(:,3)),grid,
