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dX/dt=[8.94S(1-X)-3.31XY]/(0.58X+0.18Y+1.5S+2.98)
dY/dt=dX/dt-1.457Y/(0.89Y+1.297S)-0.059d[Y/(1+Y+2S)]/dt
2dS/dt=-dX/dt-1.56S/(351Y+511.56S)-0.086d[S/(1+Y+2S)]/dt
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t        x
0        0
0.25        30.8
0.5        49.2
0.75        62.4
1        74.7
1.5        87.3
2        93.9
2.5        96.9
3        97.8
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CODE:
Constant b=1;
Variable t=[0:0.25:3],x=0,y=0,s=1;
Plot x,y,s;
ODEFunction x'=(8.94*S*(1-X)-3.31*X*Y)/(0.58*X+0.18*Y+1.5*S+2.98);
            y'=X'-1.457*b*Y/(0.89*b*Y+1.297*S)-0.059*b*(y'/(1+y+2*s)+y*(y'+2*s')/(1+y+2*s)^2);
            s'=0.5*(-x'-1.56*S/(351*b*Y+511.56*S)-0.086*(s'/(1+y+2*s)+s*(y'+2*s')/(1+y+2*s)^2));

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9Â¥2012-01-03 20:09:38
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Â¥: Originally posted by dingd at 2012-01-03 20:09:38:
µÚÒ»ÎÊ1stOptÇó½â´úÂ룺
[code]
Constant b=1;
Variable t=[0:0.25:3],x=0,y=0,s=1;
Plot x,y,s;
ODEFunction x'=(8.94*S*(1-X)-3.31*X*Y)/(0.58*X+0.18*Y+1.5*S+2.98);
            y'=X'-1.457*b*Y/(0.89 ...

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10Â¥2012-01-03 20:51:38
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