[求助]fminsearch应用出错 [复制链接]

我的M文件如下： KT.?Xp:z  
function [G5]=fun(x); e8EfQ1 Ar  
syms n1 n2 k1 k2 d; d$Y7u  
[subwave,nsub]=textread('subout.txt','%f %f'); gUR]{dq^'  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); m,R Dr  
[p,q]=size(subwave); {3Y )rY!z  
for j=1:p; +"ueq  
    wavel(j)=subwave(j,1); vNW jH!'  
    n(j)=n1+n2/((wavel(j))^2); Dw2Q 'E  
    k(j)=k1*exp(k2/wavel(j)); ^#):c`  
    N(j)=n(j)-i*k(j); P0i V<T4^  
    phase(j)=2*pi*N(j)*d/wavel(j); !>(RK"KWq]  
    ns(j)=nsub(j,1); &W6^6=E{g  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); 5y} v{Ijt  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); -.<k~71  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); \]Dt4o*yZ  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; 7yt=]1  
    t1(j)=ts(j)*T(j); UzKFf&-:;K  
    tf(j)=filmtran(j,1)/100; o+?rI p  
    difference(j)=(t1(j)-tf(j))^2; +zkm(  
end 8yWoPm<A  
G=symsum(difference(j),1,401); )ZejQ}$  
G1=subs(G,n1,sym('x(1)')); ;50_0Mv;(:  
G2=subs(G1,n2,sym('x(2)')); kzq29S  
G3=subs(G2,k1,sym('x(3)')); *fO{ a  
G4=subs(G3,k2,sym('x(4)')); DXQi-+?  
G5=subs(G4,d,sym('x(5)')); j}+5vB|0  
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CkRX>)=py  
n(lk dw  
在matlab下运行 RiO="tX'  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); ~"!a9GZ  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); 3,);0@I  
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结果出错如下： :&J8.G^  
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??? Conversion to double from sym is not possible. ecX/K.8l  
Error in ==> fminsearch at 175 bQaoMZB  
fv(:,1) = funfcn(x,varargin{:}); 0ZC,BS`D^  
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哪位高手给看看 ACjf\4Q  

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。 [BBpQN.^q6  
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万分感谢呀