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function f=modifiedweibull(x)
alpha=x(1);
beta=x(2);
lambda=x(3);
p=[0.91 1.05 1.26 1.67 1.96 2.23 2.16 2.75]*0.01;
n=[2 2 2 2 3 3 3 3];
t=[800 1000 1200 1500 1750 2000 2150 2300];

omega=n.*t./sum(n.*t);
omega=sqrt(omega);
f=sqrt(2)*omega.*(1-exp(-alpha*t.^beta.*exp(lambda.*t))-p);
f=sum(f);%Õâ¸öÊÇΪÁËÒÅ´«Ëã·¨µÄ£¬Èç¹ûÊÇ×îС¶þ³Ë¾ÍûÓÐÕâ¾ä

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