[求助]fminsearch应用出错 [复制链接]

我的M文件如下： e.)yV'%L  
function [G5]=fun(x); u4b3bH9U  
syms n1 n2 k1 k2 d; !SLP8|Cd  
[subwave,nsub]=textread('subout.txt','%f %f'); d-6sC@PB  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); P?Gd}mdX?m  
[p,q]=size(subwave); ql#{=oGDnA  
for j=1:p; 2.fyP"P L  
    wavel(j)=subwave(j,1); mhHA!:Y  
    n(j)=n1+n2/((wavel(j))^2); Q%,o8E2~  
    k(j)=k1*exp(k2/wavel(j)); 1S*8v7  
    N(j)=n(j)-i*k(j); >:Rt>po8|w  
    phase(j)=2*pi*N(j)*d/wavel(j); \N# HPrv}  
    ns(j)=nsub(j,1); h/0<:eZ*  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); 8k
+q7  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); WL IDw@fv  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); xh+AZ3  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; 8!`7-  
    t1(j)=ts(j)*T(j); Vze!/ED  
    tf(j)=filmtran(j,1)/100; _/QKWk&j  
    difference(j)=(t1(j)-tf(j))^2; )V[w:=*  
end ct2_N  
G=symsum(difference(j),1,401); 0UM@L }L  
G1=subs(G,n1,sym('x(1)')); :,h=2a_ 8  
G2=subs(G1,n2,sym('x(2)')); !L0E03')k  
G3=subs(G2,k1,sym('x(3)')); }<5\O*kX4  
G4=subs(G3,k2,sym('x(4)')); FT*yso:X/  
G5=subs(G4,d,sym('x(5)')); U(S@1i(  
sx)$=~o  
)H[h53bIq  
)*^OPVt  
在matlab下运行 $4$?M[  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); s]nGpA[!  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); ?{@!!te@3v  
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结果出错如下： %T&&x2p^=?  
;3.T* ?|o  
??? Conversion to double from sym is not possible. ~n8Oyr  
Error in ==> fminsearch at 175 4 BE:&A  
fv(:,1) = funfcn(x,varargin{:}); {Gk}3u/  
8^P2GG'+-  
哪位高手给看看 J-eA,9J  

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。 (<>Sz(  
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万分感谢呀