[求助]fminsearch应用出错 [复制链接]

我的M文件如下： q".l:T%|C}  
function [G5]=fun(x); mT!~;]RrF  
syms n1 n2 k1 k2 d; [W^6=7EO  
[subwave,nsub]=textread('subout.txt','%f %f'); IDLA-Vxo  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); /x$jd)C  
[p,q]=size(subwave); HO' ELiZ_q  
for j=1:p; CuuHRvU8  
    wavel(j)=subwave(j,1); xg3G  
    n(j)=n1+n2/((wavel(j))^2); 0Fbq/63  
    k(j)=k1*exp(k2/wavel(j)); ?\c*DNM'  
    N(j)=n(j)-i*k(j); &p=~=&g=  
    phase(j)=2*pi*N(j)*d/wavel(j); _
e`b^_  
    ns(j)=nsub(j,1); UK_2i(I"e  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); ^~(bm$4r
  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); S;|%'Sn|j9  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); !>>$'.nb@~  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; _II;$_N  
    t1(j)=ts(j)*T(j); ;K:.*sAa  
    tf(j)=filmtran(j,1)/100; H2k>E}`  
    difference(j)=(t1(j)-tf(j))^2; Bb-x1{t  
end P6IhpB59  
G=symsum(difference(j),1,401); v[Ar{t&  
G1=subs(G,n1,sym('x(1)')); +d#ZSNu/  
G2=subs(G1,n2,sym('x(2)')); yP-.8[;  
G3=subs(G2,k1,sym('x(3)')); &<!I]:Y  
G4=subs(G3,k2,sym('x(4)')); ia?8Z"&lK  
G5=subs(G4,d,sym('x(5)')); >aa-i
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在matlab下运行 F~* 5`o  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); *B3` #t  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); @x{;a9y  
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结果出错如下： z` gR*+  
8.9S91]=  
??? Conversion to double from sym is not possible. N'[^n,\(:  
Error in ==> fminsearch at 175 nnr(\r~  
fv(:,1) = funfcn(x,varargin{:}); 0eUsvzz15  
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哪位高手给看看 n*_FC  

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。 ]2Lwd@  
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T.&^1qWWA  
万分感谢呀