fminsearch函数咨询。

X=[1,3,5,10,30,50,80,150,300,500,800,1500];

Y=[0.551,0.548,0.543,0.53,0.508,0.498,0.489,0.471,0.45,0.43,0.411,0.375];

N=length(X);

Y_new=1/(log(exp(1)+(X./a(1)).^a(2))).^a(3);

函数 f=sum((Y-Y_new).^2)/N;

如何利用fminsearch函数对功能函数f进行搜索最小值得到a(1)，a(2)，a(3)，谢谢！

Answer 1

[facaso]

感觉结果不一定准，但是可以这么写

f = @(x)sum((1./(log(exp(1)+(X./x(1)).^x(2))).^x(3)-Y).^2);

[x,fval]=fminsearch(f,[100 0.5 0.5])