[求助]fminsearch应用出错 [复制链接]

我的M文件如下： !Uhcjfq`e  
function [G5]=fun(x); V@1,((,l  
syms n1 n2 k1 k2 d; ^6!8)7b  
[subwave,nsub]=textread('subout.txt','%f %f'); azTiY@/  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); 5xH*&GpL7  
[p,q]=size(subwave); GB6(WAmr  
for j=1:p; |Y2n6gkH[  
    wavel(j)=subwave(j,1); s:tWEgZk?  
    n(j)=n1+n2/((wavel(j))^2); Z_T~2t  
    k(j)=k1*exp(k2/wavel(j)); u(`7F(R  
    N(j)=n(j)-i*k(j); eYv+tjIF  
    phase(j)=2*pi*N(j)*d/wavel(j); %r:4'$E7|  
    ns(j)=nsub(j,1); =[gFa
B_H  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); dcE(uf  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); +]Z*_?j9{  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); eNm Wul  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; gM6o~ E  
    t1(j)=ts(j)*T(j); FGpV ]p  
    tf(j)=filmtran(j,1)/100; BbzIQg:  
    difference(j)=(t1(j)-tf(j))^2; l@@qpaH  
end j?!/#'  
G=symsum(difference(j),1,401); a]I~.$G   
G1=subs(G,n1,sym('x(1)')); f>?b2a2HX  
G2=subs(G1,n2,sym('x(2)')); ;y>}LGG  
G3=subs(G2,k1,sym('x(3)'));
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G4=subs(G3,k2,sym('x(4)')); fs#9*<]m  
G5=subs(G4,d,sym('x(5)')); J^pq<   
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在matlab下运行 VB4
ir\nF  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); ZYz8ul$E  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); os+]ct  
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结果出错如下： 9
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* a VT  
??? Conversion to double from sym is not possible. X>MDX.Z  
Error in ==> fminsearch at 175 (%{!TJgZR  
fv(:,1) = funfcn(x,varargin{:}); O+~@S~  

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哪位高手给看看 jZqCM{  

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。 twql)lbx  
@P<Mc)o^  
ODPWFdRar  
万分感谢呀