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function ydot=fun(t,y,flag,a,b,c)
ydot=[y(1)*(a-b*y(1)-c*y(2));
%dI1/dt
y(2)*(a-b*y(2)-c*y(1))];
%dI2/dt

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a=1; b=1; c=0.5;
axis([0,2,0,2]);
hold on
x0=[0.2,0.4,0.6,0.8,1,1.2,1.4,1.6,1.8,2];
for i=1:10
[t,y]=ode45('fun',[0:0.01:100],[x0(i),2],[ ],a,b,c);
plot(y(:,1),y(:,2),'b');axis square
end
y0=[0.2,0.4,0.6,0.8,1,1.2,1.4,1.6,1.8,2];
for i=1:10
[t,y]=ode45('fun',[0:0.01:100],[2,y0(i)],[ ],a,b,c);
plot(y(:,1),y(:,2),'b');axis square
end


a=1; b=1; c=0.5;
axis([0,2,0,2]);
hold on
x0=[0.2,0.4,0.6,0.8,1,1.2,1.4,1.6,1.8,2];
for i=1:10
[t,y]=ode45('fun',[0:0.01:100],[x0(i),2],[ ],a,b,c);
plot(y(:,1),y(:,2),'b');axis square
end
y0=[0.2,0.4,0.6,0.8,1,1.2,1.4,1.6,1.8,2];
for i=1:10
[t,y]=ode45('fun',[0:0.01:100],[2,y0(i)],[ ],a,b,c);
plot(y(:,1),y(:,2),'b');axis square
end
x0=[0.02,0.04,0.06,0.08,0.1,0.12,0.14,0.16,0.18,0.2];
for i=1:10
[t,y]=ode45('fun',[0:0.01:100],[x0(i),0.2],[ ],a,b,c);
plot(y(:,1),y(:,2),'b');axis square
end
y0=[0.02,0.04,0.06,0.08,0.1,0.12,0.14,0.16,0.18,0.2];
for i=1:10
[t,y]=ode45('fun',[0:0.01:100],[0.2,y0(i)],[ ],a,b,c);
plot(y(:,1),y(:,2),'b');axis square
end




[ Last edited by zhaoyuan0426 on 2012-4-14 at 22:27 ]
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luomia

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3Â¥2012-07-02 11:22:09
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