[求助]fminsearch应用出错 [复制链接]

我的M文件如下： 8*$HS.Db'  
function [G5]=fun(x); W08rGY  
syms n1 n2 k1 k2 d; :"im2J  
[subwave,nsub]=textread('subout.txt','%f %f'); eI@nskq#  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); 5w^6bw){  
[p,q]=size(subwave); <F%c"Rkh  
for j=1:p; Dwx^hNh  
    wavel(j)=subwave(j,1); 6\BZyry3*  
    n(j)=n1+n2/((wavel(j))^2); LA9'HC(5  
    k(j)=k1*exp(k2/wavel(j)); 3<"!h1x5  
    N(j)=n(j)-i*k(j); ;1[a*z<l&s  
    phase(j)=2*pi*N(j)*d/wavel(j); 1x'H#  
    ns(j)=nsub(j,1); vB<2f*U  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); :4\=xGiY  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); e$t$,3~  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); X?B\+dq  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; qRbU@o.3  
    t1(j)=ts(j)*T(j); ,qz:(Nr  
    tf(j)=filmtran(j,1)/100; .{8?eze[m  
    difference(j)=(t1(j)-tf(j))^2; ?LAiSg=eq  
end N"zg)MsX  
G=symsum(difference(j),1,401); '<R::M,  
G1=subs(G,n1,sym('x(1)')); hN"cXz"/  
G2=subs(G1,n2,sym('x(2)')); r:~q{  
G3=subs(G2,k1,sym('x(3)')); o"19{D^.  
G4=subs(G3,k2,sym('x(4)')); RF|r@/S  
G5=subs(G4,d,sym('x(5)')); -TT{4\%s  
N'@E^ rYc  
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在matlab下运行 #*~3gMI{=  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); ]*&`J4i  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); .Z9{\tj  
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结果出错如下： v1aE[Q  
']__V[  
??? Conversion to double from sym is not possible. :< *xG&  
Error in ==> fminsearch at 175 p?H2W-  
fv(:,1) = funfcn(x,varargin{:}); nYE''g+x  
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哪位高手给看看 h~r&7G@[}  

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。 ~LU$ no^  
~gA^tc3G  
K4vOy_wT  
万分感谢呀