[求助]fminsearch应用出错 [复制链接]

我的M文件如下： )Xdq+$w.  
function [G5]=fun(x); o*K7(yUL4  
syms n1 n2 k1 k2 d; ?`+VWa[,e  
[subwave,nsub]=textread('subout.txt','%f %f'); -6)nQNj|  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); %bw+>:Tr  
[p,q]=size(subwave); uH\EV`@'  
for j=1:p; #$UwJB]_D  
    wavel(j)=subwave(j,1); )>~jjR  
    n(j)=n1+n2/((wavel(j))^2); ;1&"]N%  
    k(j)=k1*exp(k2/wavel(j)); V Rv4p5  
    N(j)=n(j)-i*k(j); JSUD$|RiJ  
    phase(j)=2*pi*N(j)*d/wavel(j); lw3H 8[  
    ns(j)=nsub(j,1); P5my]4|x  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); tav@a)  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); WN]k+0#  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); %U{6 `m  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; .]E(P   
    t1(j)=ts(j)*T(j); #?)6^uTW  
    tf(j)=filmtran(j,1)/100; G@P;#l`(D  
    difference(j)=(t1(j)-tf(j))^2; y A5h^I  
end 82FEl~,^E  
G=symsum(difference(j),1,401); M4Cb(QAVP  
G1=subs(G,n1,sym('x(1)')); Rxdj}xy  
G2=subs(G1,n2,sym('x(2)')); tQ@7cjq8bA  
G3=subs(G2,k1,sym('x(3)')); lL zR5445)  
G4=subs(G3,k2,sym('x(4)')); D2VYw<tEA  
G5=subs(G4,d,sym('x(5)')); +mjwX?yF  
3>n&u,Xe  
)VQ[}iT  
"d<ucj  
在matlab下运行 )ThNy:4  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); oI#TjF  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); =x+1A)Q  
G+#bO5  
|6^a[x3/U  
结果出错如下： xDeM7L'  
oL9<Fi  
??? Conversion to double from sym is not possible. 25Ee+&&%  
Error in ==> fminsearch at 175 G9XkimQ'  
fv(:,1) = funfcn(x,varargin{:}); ZC2aIJ  
Foq3==*p  
哪位高手给看看 qJF'KHyU{l  

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。 K'2N:.D:  
6Z1O:Bou  
,X|FyO(p  
万分感谢呀