[求助]fminsearch应用出错 [复制链接]

我的M文件如下： xgsEJE  
function [G5]=fun(x); ZDHm@,d  
syms n1 n2 k1 k2 d; Zy!^HS$  
[subwave,nsub]=textread('subout.txt','%f %f'); ?` ?HqR0  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); dk<) \C"  
[p,q]=size(subwave); 'ii5pxeNI  
for j=1:p; {D6lSj  
    wavel(j)=subwave(j,1); y8oqCe)  
    n(j)=n1+n2/((wavel(j))^2); pC=kvve  
    k(j)=k1*exp(k2/wavel(j)); u7Z-kZ
  
    N(j)=n(j)-i*k(j); &y\7
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    phase(j)=2*pi*N(j)*d/wavel(j); 0\W
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    ns(j)=nsub(j,1); BO5\rRa0  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); b+b].,  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); >@Vap  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); jL^3/0"o  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; -8Z;s8ACo  
    t1(j)=ts(j)*T(j); >;wh0dBe  
    tf(j)=filmtran(j,1)/100; bF_SD\/  
    difference(j)=(t1(j)-tf(j))^2; pZeJ$3@vk  
end [S Jx\Os  
G=symsum(difference(j),1,401); JDbRv'F:(  
G1=subs(G,n1,sym('x(1)')); ~w Ekbq=  
G2=subs(G1,n2,sym('x(2)')); Epo/}y  
G3=subs(G2,k1,sym('x(3)')); Fa]|Y  
G4=subs(G3,k2,sym('x(4)')); pNt,RRoR  
G5=subs(G4,d,sym('x(5)')); yRd[$p  
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=}F}XSvXH  
在matlab下运行 _+B{n^ {  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); _
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>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); eMHBY6<~=  
T?lp:~d  
msf%i!  
结果出错如下： Vt4KG+zm  
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??? Conversion to double from sym is not possible. luvxwved  
Error in ==> fminsearch at 175 l%\p  
fv(:,1) = funfcn(x,varargin{:}); W!Qaa(o?  
pB(|Y]3A  
哪位高手给看看 g"}j  

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。 /mK."5-cm  
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万分感谢呀