[求助]fminsearch应用出错 [复制链接]

我的M文件如下： uz#PBV8Q  
function [G5]=fun(x); (OyY_`  
syms n1 n2 k1 k2 d; 5\w=(c9A  
[subwave,nsub]=textread('subout.txt','%f %f'); !jnqA Z  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); .5!sOOs$P  
[p,q]=size(subwave); ,M@m4bx  
for j=1:p; |pH* CCA  
    wavel(j)=subwave(j,1); j[/SXF\=  
    n(j)=n1+n2/((wavel(j))^2); w38c  
    k(j)=k1*exp(k2/wavel(j)); `$V[;ld(mz  
    N(j)=n(j)-i*k(j); hX8gV~E=y  
    phase(j)=2*pi*N(j)*d/wavel(j); %O&m#)|  
    ns(j)=nsub(j,1); U+*oI*  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); &V#zkW  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); }(+=/$C"#  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); 6L8tz8  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; K=c=/`E  
    t1(j)=ts(j)*T(j); /NW>;J}C  
    tf(j)=filmtran(j,1)/100; xxoHH#a  
    difference(j)=(t1(j)-tf(j))^2; A3MZxu=':3  
end 3|K=%jr[  
G=symsum(difference(j),1,401); O2q=gYX>\  
G1=subs(G,n1,sym('x(1)')); vLBee>$  
G2=subs(G1,n2,sym('x(2)')); fVH*dX'Jz  
G3=subs(G2,k1,sym('x(3)')); NMl ?Y uEv  
G4=subs(G3,k2,sym('x(4)')); Txt%nzIu  
G5=subs(G4,d,sym('x(5)')); bB;~,W&E1  
!dyxE'T2  
t+3   
T2:oWjC3$  
在matlab下运行 L}}=yh6r  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); }fJ:wku  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); <78$]Z2we  
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结果出错如下： >'} Y1_S5  
K0O-WJ  
??? Conversion to double from sym is not possible. 0'yG1qG  
Error in ==> fminsearch at 175 mUrS&&fu8  
fv(:,1) = funfcn(x,varargin{:}); `1fJ:b/M  
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哪位高手给看看 1V|< A  

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。 K1?Z5X(b  
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万分感谢呀