[求助]fminsearch应用出错 [复制链接]

我的M文件如下： L1F){8[  
function [G5]=fun(x); R=e`QMq  
syms n1 n2 k1 k2 d; 0I#<-9&d-  
[subwave,nsub]=textread('subout.txt','%f %f'); PN.6BJvu  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); &1Y+q]  
[p,q]=size(subwave); }s)Z:6;(,q  
for j=1:p; 8p5'}Lq  
    wavel(j)=subwave(j,1); iEU(1?m2-  
    n(j)=n1+n2/((wavel(j))^2); S;t~"87v*  
    k(j)=k1*exp(k2/wavel(j)); >^Y9p~  
    N(j)=n(j)-i*k(j); >)N#n`  
    phase(j)=2*pi*N(j)*d/wavel(j); 78.sf{I  
    ns(j)=nsub(j,1); yjSN;3t71  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); 4;*V^\',9  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); zu^ AkMc  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); >N,G@{FR  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; t%TZu>(1O  
    t1(j)=ts(j)*T(j); |SxEJ  
    tf(j)=filmtran(j,1)/100; kEXcEF_9P  
    difference(j)=(t1(j)-tf(j))^2; "(xS  
end ;=7z!:)  
G=symsum(difference(j),1,401); mi-\PD>X  
G1=subs(G,n1,sym('x(1)')); "
~[Rwh?  
G2=subs(G1,n2,sym('x(2)')); Qb|dp~K.M  
G3=subs(G2,k1,sym('x(3)')); c3}}cFe  
G4=subs(G3,k2,sym('x(4)')); .Yf h*  
G5=subs(G4,d,sym('x(5)')); %/^d]#  
-0]aOT--  
RhJ<<T.2  
r zvX~B6  
在matlab下运行 {10ms_s  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); va<+)b\  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); aQG#bh [  
z=fag'fzM  
/Mk)H d  
结果出错如下： :1{j&$  
;+jp,( 7  
??? Conversion to double from sym is not possible. nY8UJy}<oL  
Error in ==> fminsearch at 175 p']AXJ`Z  
fv(:,1) = funfcn(x,varargin{:}); =;`YtOL  
((5zwD  
哪位高手给看看 [D,:=p`  

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。 O<3,n;56Z  
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万分感谢呀