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syms S0;%¶¨Òå±äÁ¿S0
n=5;
S1=[100 80 60 40 30 ];%Ó¦Á¦
y=log10([1534 53187 153854 754156]);
x=log10(S1-S0);
A=x./(S1-S0);
B=y./(S1-S0);
C=1./(S1-S0);
Lx0=sum(A)-(1/n)*sum(x)*sum(C);
Ly0=sum(B)-(1/n)*sum(y)*sum(C);
Lxx=sum(x.*x)-(1/n)*sum(x)*sum(x);
Lyy=sum(y.*y)-(1/n)*sum(y)*sum(y);%LÏà¹ØÊ½×Ó¶¼ÊÇS0º¬ÓÐS0µÄ

H=Lx0/Lxx-Ly0/Lyy;

f=inline('');%Óöþ·Ö·¨ÇóH=0µÄ¸ù£¬ÕâÒ»²½ÎÒ²»Ì«¶®£¬²»ÖªµÀÀ¨ºÅÀïÃæ·Åʲô
a=0;
b=100;
dlt=0.5*1.0e-5;
k=1;
while abs(b-a)>dlt
c=(a+b)/2;
if f(c)==0
break;
elseif f(c)*f(b)<0
a=c;
else b=c;
end
fprintf('k=%d,S0=%.5f\n',k,c);
k=k+1;
end
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