[求助]fminsearch应用出错 [复制链接]

我的M文件如下： ](>YjE0  
function [G5]=fun(x); ;I~UQgE6H  
syms n1 n2 k1 k2 d; fhmBKeFdV  
[subwave,nsub]=textread('subout.txt','%f %f'); xmHW,#%ui\  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); Pa"[&{:  
[p,q]=size(subwave); K[i&!Z&  
for j=1:p; BQ(sjJ$v6F  
    wavel(j)=subwave(j,1); ';I(#J6  
    n(j)=n1+n2/((wavel(j))^2); Vs(D(d,  
    k(j)=k1*exp(k2/wavel(j)); /l;_ xs  
    N(j)=n(j)-i*k(j); R_b)2FU1y  
    phase(j)=2*pi*N(j)*d/wavel(j); :a_MT  
    ns(j)=nsub(j,1); vWjHHw  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); @^nE^;  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); n\u3$nGL1`  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); B*n_ VBd  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; U[6 ~ad a  
    t1(j)=ts(j)*T(j); `Wp y6o  
    tf(j)=filmtran(j,1)/100; 8r48+_y3u  
    difference(j)=(t1(j)-tf(j))^2; 9eEA80i7  
end +5H1n(6)  
G=symsum(difference(j),1,401); Z._%T$8aJv  
G1=subs(G,n1,sym('x(1)')); T 2Gscey  
G2=subs(G1,n2,sym('x(2)')); a#m T@l\  
G3=subs(G2,k1,sym('x(3)')); h&z(;B!;y.  
G4=subs(G3,k2,sym('x(4)')); 6&,9=(:J&R  
G5=subs(G4,d,sym('x(5)')); =r^Pu|  
9Rb tFwbn  
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在matlab下运行 *OHaqe(*  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); ,{BF`5bn|  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); a6hDw'8!  
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结果出错如下： q6eD{/4
a1  
Q
aSRD/,M  
??? Conversion to double from sym is not possible. +4V"&S|&  
Error in ==> fminsearch at 175 oFp4*<\  
fv(:,1) = funfcn(x,varargin{:}); q=
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哪位高手给看看 7&1dr  

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。
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万分感谢呀