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11Â¥2011-11-16 19:24:12
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12Â¥2011-11-16 19:45:15
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dbb627

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dX/dt=[8.94S(1-X)-3.31XY]/(0.58X+0.18Y+1.5S+2.98)
dY/dt=dX/dt-2.26Y/(Y+2S)
2dS/dt=-dX/dt-0.012S/(Y+2S)
µ±t=0ʱ,X=0,Y=0,S=1
tµÄ×î´óֵΪ3
CODE:
odefun=@(t,x)[(8.94*x(3)*(1-x(1))-3.31*x(1)*x(2))/(0.58*x(1)+0.18*x(2)+1.5*x(3)+2.98);...
     (8.94*x(3)*(1-x(1))-3.31*x(1)*x(2))/(0.58*x(1)+0.18*x(2)+1.5*x(3)+2.98)-2.26*x(2)/(x(2)+2*x(3));...
     -0.5*(8.94*x(3)*(1-x(1))-3.31*x(1)*x(2))/(0.58*x(1)+0.18*x(2)+1.5*x(3)+2.98)-0.006*x(3)/(x(2)+2*x(3))];
[t,x]=ode45(odefun,[0 3],[0 0 1]);
plot(t,x)
legend('t-X','t-Y','t-S')





[ Last edited by dbb627 on 2011-11-16 at 19:54 ]
The more you learn, the more you know, the more you know, and the more you forget. The more you forget, the less you know. So why bother to learn.
13Â¥2011-11-16 19:48:07
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14Â¥2011-11-16 19:57:07
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dingd

Ìú¸Ëľ³æ (Ö°Òµ×÷¼Ò)

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dbb627(½ð±Ò+1): »¶Ó­½»Á÷ 2011-12-06 08:46:07
ÓÃ1stOptÊÔÏ£¬Ò²ºÜ¼òµ¥£º
CODE:
Variable t=[0,3],X=0,Y=0,S=1;
Plot x,y,s;
ConstStr f=(8.94*S*(1-X)-3.31*X*Y)/(0.58*X+0.18*Y+1.5*S+2.98);
ODEFunction X'=f;
            Y'=f-2.26*Y/(Y+2*S);
            S'=(-f-0.012*S/(Y+2*S))/2;



15Â¥2011-12-03 20:18:46
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