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tic   
       [X,fval,exitflag,output]= fmincon('lasteightpara_EKFfmincon_garch',X0,...
       [0,0,0,-1,-1,0,0,0,0,0,0,0;0,0,0,1,1,0,0,0,0,0,0,0],[0;1],[],[],...
       [-2,0,-2,0,0,0,0,100,-3,0,0,0],...
       [2,2,2,2,2,2,3,600,3,3,2,2],[],options,z1);
   t=toc;
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