[求助]fminsearch应用出错 [复制链接]

我的M文件如下： coXm*X>z  
function [G5]=fun(x); w(%$~]h  
syms n1 n2 k1 k2 d; ac43d`wpK  
[subwave,nsub]=textread('subout.txt','%f %f'); KmF+3g~#s  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); oe_,q&e  
[p,q]=size(subwave); A{eh$Ot%  
for j=1:p; Ip,0C8T`Q  
    wavel(j)=subwave(j,1); >y@3`u]  
    n(j)=n1+n2/((wavel(j))^2); nzi)4"3O  
    k(j)=k1*exp(k2/wavel(j)); AIQ]lQ(  
    N(j)=n(j)-i*k(j); yle~hL  
    phase(j)=2*pi*N(j)*d/wavel(j); |msQ  
    ns(j)=nsub(j,1); 6:bvq?5a5  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); !E/%Hv1  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); iaaD1<m  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); V+y:!t`  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; V,3$>4x  
    t1(j)=ts(j)*T(j); X2('@Yh  
    tf(j)=filmtran(j,1)/100; 4mWT"T-8  
    difference(j)=(t1(j)-tf(j))^2; nR?m,J  
end yc$8X sns  
G=symsum(difference(j),1,401); \xtmd[7lb<  
G1=subs(G,n1,sym('x(1)')); sv>c)L}I  
G2=subs(G1,n2,sym('x(2)')); }~Y#N  
G3=subs(G2,k1,sym('x(3)')); /I#SP/M&l  
G4=subs(G3,k2,sym('x(4)')); (XA]k%45  
G5=subs(G4,d,sym('x(5)')); ~F]If\b  
c:`&QDF  
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P-lE,X   
在matlab下运行 z9*7fT  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); NB/ wJ3 F  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); }qdGS<{  
T EqCoeR  
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结果出错如下： DU[vLe|Z  
0 Pa\:^/6  
??? Conversion to double from sym is not possible. A?OaP  
Error in ==> fminsearch at 175 $zV[-d  
fv(:,1) = funfcn(x,varargin{:}); Dadl
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R*psL&N  
哪位高手给看看 0~N2MoOl^  

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。 !pLQRnI}6  
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万分感谢呀