[求助]fminsearch应用出错 [复制链接]

我的M文件如下： o- QG& ]  
function [G5]=fun(x); lPcVhj6No%  
syms n1 n2 k1 k2 d; Re,$<9V  
[subwave,nsub]=textread('subout.txt','%f %f'); ZR-s{2sl  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); +V+*7s%fL  
[p,q]=size(subwave); ZDkD%SCy  
for j=1:p; CNRU"I+jU  
    wavel(j)=subwave(j,1); "kBqY+:Cn  
    n(j)=n1+n2/((wavel(j))^2); EfBVu  
    k(j)=k1*exp(k2/wavel(j)); :Nj`_2  
    N(j)=n(j)-i*k(j); l88a#zUQDN  
    phase(j)=2*pi*N(j)*d/wavel(j); qzlMn)e  
    ns(j)=nsub(j,1); :CkR4J!m3  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); a[74%L?  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); #C,f/PXfaB  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); jPYe_y  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; q4
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    t1(j)=ts(j)*T(j); m~j\?mb{+  
    tf(j)=filmtran(j,1)/100; FH`'1iVH  
    difference(j)=(t1(j)-tf(j))^2; Q(;B)  
end |N=@E,33  
G=symsum(difference(j),1,401); r0g/:lJi  
G1=subs(G,n1,sym('x(1)')); bDFCZH-:'O  
G2=subs(G1,n2,sym('x(2)')); 4j/iG\  
G3=subs(G2,k1,sym('x(3)')); ,JQxs7@2k  
G4=subs(G3,k2,sym('x(4)')); 'Elj"Iiu  
G5=subs(G4,d,sym('x(5)')); h\u0{!@}  
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dp[w?AMhM9  
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在matlab下运行 mj(&`HRs4  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); lR@i`)'?U  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); ^0s\/qyqm  
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结果出错如下： -#S)}NEn  
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??? Conversion to double from sym is not possible. pe!dm}!h[  
Error in ==> fminsearch at 175 7dlKdKH  
fv(:,1) = funfcn(x,varargin{:}); b,rH&+2H  
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哪位高手给看看 /[20e1 w!  

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。 0~Iu7mPY  
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万分感谢呀