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x=1:8; 
y=[15.3,20.5,27.4,36.6,49.1,65.6,87.8,117.6]; 
y1=log(y); 
n=1;%表示用一次函数拟和 
m=length(x); 
A=zeros(m,n+1); 
for i=1:2 
    A(:,i)=x.^(i-1)'; 
end 
B=A'*A; 
C=A'*y1'; 
re=B\C; 
a=exp(re(1)); 
b=re(2); 
Y=a*exp(b*x); 
err=norm(Y-y,2) 
plot(x,y,'r+',x,Y,'g'); 
xlabel('x'); 
ylabel('y'); 
legend('原始数据','拟和曲线');