[求助]fminsearch应用出错 [复制链接]

我的M文件如下： @A1f#Ed<
 
function [G5]=fun(x); 1nAm\/&  
syms n1 n2 k1 k2 d; .]vb\N
BK7  
[subwave,nsub]=textread('subout.txt','%f %f'); a*cWj}u  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); i=Qy?aU?  
[p,q]=size(subwave); wb.yGfJ  
for j=1:p; E#KZZ lbx  
    wavel(j)=subwave(j,1); ;gZ ^c]\  
    n(j)=n1+n2/((wavel(j))^2); 64?HqO 6(  
    k(j)=k1*exp(k2/wavel(j)); zo
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    N(j)=n(j)-i*k(j); 0*XsAz1,9  
    phase(j)=2*pi*N(j)*d/wavel(j); s>J5.Z7"'j  
    ns(j)=nsub(j,1); E5^\]`9P  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); q2EDrZ  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); e(8hSVcl4  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); UT\4Xk<  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; WA(x]""  
    t1(j)=ts(j)*T(j); I<D#   
    tf(j)=filmtran(j,1)/100; 1cK'B<5">]  
    difference(j)=(t1(j)-tf(j))^2; +|LM"  
end '.bf88D  
G=symsum(difference(j),1,401); s:tX3X  
G1=subs(G,n1,sym('x(1)')); X9Ch(nWX  
G2=subs(G1,n2,sym('x(2)')); ]:gW+6w"C  
G3=subs(G2,k1,sym('x(3)')); vS8&,wJ!  
G4=subs(G3,k2,sym('x(4)')); * 1;4&/93o  
G5=subs(G4,d,sym('x(5)')); hBX*02p  
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在matlab下运行 w7@`:W  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); Lu}jk W*  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); 9A"s7iJ)  
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结果出错如下： CV @P +  
712nD ?>  
??? Conversion to double from sym is not possible. @[g7\d  
Error in ==> fminsearch at 175 ~lo43$)^  
fv(:,1) = funfcn(x,varargin{:}); vIRT$W' O}  
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哪位高手给看看 'f<N7%eZ  

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。 Rn?JMM]  
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万分感谢呀