[求助]fminsearch应用出错 [复制链接]

我的M文件如下： H%XF~tF:  
function [G5]=fun(x); ca,W:9#.xn  
syms n1 n2 k1 k2 d; :o .+<_&  
[subwave,nsub]=textread('subout.txt','%f %f'); 1]eRragm"  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); 7F6B  
[p,q]=size(subwave); [`oVMR  
for j=1:p; <e?Eva%t`  
    wavel(j)=subwave(j,1); [61*/=gWe  
    n(j)=n1+n2/((wavel(j))^2); "TJ*mN.i{}  
    k(j)=k1*exp(k2/wavel(j)); w]yVNB  
    N(j)=n(j)-i*k(j); b,YNCb]H  
    phase(j)=2*pi*N(j)*d/wavel(j); 7KX27.~F  
    ns(j)=nsub(j,1); M;,$
)>P  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); XL^05  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); PCHspe9!y  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); Y)DX   
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; S,nELV~!  
    t1(j)=ts(j)*T(j); U: Wet,  
    tf(j)=filmtran(j,1)/100; @aZTx/  
    difference(j)=(t1(j)-tf(j))^2; (y
7X1Qc)  
end !&>`  
G=symsum(difference(j),1,401); )S(Ly.  
G1=subs(G,n1,sym('x(1)')); "I)zi]vk  
G2=subs(G1,n2,sym('x(2)')); 8\!E )M|4  
G3=subs(G2,k1,sym('x(3)')); Y}v3
J(l  
G4=subs(G3,k2,sym('x(4)')); Hj|&P/jY]*  
G5=subs(G4,d,sym('x(5)')); TKv!wKI  
w$6Z}M1d  
3,Yr%`/5'  
8"9&x} tl-  
在matlab下运行 /De~K+w7o  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); #}FUau$  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); z__?kY  
3>-h- cpMX  
D,ZLo~  
结果出错如下： %:d7Ts&?Z  
=uH2+9.  
??? Conversion to double from sym is not possible. ~cCMLK em  
Error in ==> fminsearch at 175 rO$pj~!|Q  
fv(:,1) = funfcn(x,varargin{:}); ft6)n T/"&  
xlS*9>Ij  
哪位高手给看看 wCB*v<*  

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。 >8"Svt$  
Oh*~+/u}q  
_TOWqV^  
万分感谢呀