[求助]fminsearch应用出错 [复制链接]

我的M文件如下： !Ie={BpzbZ  
function [G5]=fun(x); za4:Jdr  
syms n1 n2 k1 k2 d; {f%x8t$  
[subwave,nsub]=textread('subout.txt','%f %f'); z"@UNypc,  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); ,?!4P+ob  
[p,q]=size(subwave); ];}7 %3  
for j=1:p; 1QuR7p  
    wavel(j)=subwave(j,1); s\1c.  
    n(j)=n1+n2/((wavel(j))^2); ATU]KL!{  
    k(j)=k1*exp(k2/wavel(j)); UazUr=|e  
    N(j)=n(j)-i*k(j); [E%Ov0OC  
    phase(j)=2*pi*N(j)*d/wavel(j); p8u-
3  
    ns(j)=nsub(j,1); :j#Fq d[DF  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); M$GZK'%  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); 4ze4{a^  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); :E9@9>3S  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; c3aF lxW  
    t1(j)=ts(j)*T(j); VbzW4J_  
    tf(j)=filmtran(j,1)/100; L[:b\O/p,  
    difference(j)=(t1(j)-tf(j))^2; _NJq%-,'  
end SA16Ng  
G=symsum(difference(j),1,401); {5gh.  
G1=subs(G,n1,sym('x(1)')); IOOAaa @(  
G2=subs(G1,n2,sym('x(2)')); 2l!* o7  
G3=subs(G2,k1,sym('x(3)')); gkDlh{  
G4=subs(G3,k2,sym('x(4)')); H#j Z'I  
G5=subs(G4,d,sym('x(5)')); &ffd#2f`@  
! .|\}=[e  
dD8f`*"*=  
}xM >F%  
在matlab下运行 Vam4/6  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); ;O7<lF\7o  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); CR<Nau>  
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结果出错如下： OmX(3>:9  
aC2\C=ru_  
??? Conversion to double from sym is not possible. g!`$bF=e  
Error in ==> fminsearch at 175 {m+(j (6-  
fv(:,1) = funfcn(x,varargin{:}); VBK9te,A  
${F]N }  
哪位高手给看看 PxHHh{y%c  

哪位高人告诉我，错误在哪里呀。M文件复制到命令行，执行，一切正常，就是在求解多元函数0值时，不知道哪里错了。 ,!s;o6|*y  
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gOA  
万分感谢呀