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t0=0;
Y00=[a;0;b;0];
fix_Y00=ones(4,1);%ÌâÄ¿ÖÐY0È«¸ø³öʱ£¬È«Îª1
dY0=[0;0;0;0];
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[Y02,dY02]=decic(@function,t0,Y00,fix_Y00,dY0,fix_dY0);

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??? Error using ==> decic>sls at 131
Try freeing 4 fixed components.

Error in ==> decic at 80
    [dy,dyp] = sls(res,dfdy,dfdyp,neq,free_y,free_yp);

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>> [t,Y]=ode15i(@function,Tspan,Y0,Yp0,options);
Warning: Failure at t=8.015625e-003.  Unable to meet integration tolerances without reducing
the step size below the smallest value allowed (2.847722e-017) at time t.
> In ode15i at 416
>>
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