[求助]fminsearch应用出错 [复制链接]

我的M文件如下： Dk^T_7{  
function [G5]=fun(x); -+HD5Hc  
syms n1 n2 k1 k2 d; 5OM*NT t  
[subwave,nsub]=textread('subout.txt','%f %f'); $/FL)m8.3  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); dcH@$D@~S  
[p,q]=size(subwave); ~7$jW[i  
for j=1:p; C@P*:L_  
    wavel(j)=subwave(j,1);
..fbRt  
    n(j)=n1+n2/((wavel(j))^2); DyC
nL@  
    k(j)=k1*exp(k2/wavel(j)); vUR@P -  
    N(j)=n(j)-i*k(j); ,382O$C  
    phase(j)=2*pi*N(j)*d/wavel(j); @=6*]:p2.  
    ns(j)=nsub(j,1);
RQ;}+S  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); 9#:B_?e=  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); E#VF7 9L  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); %
hVI*p3  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; ZkqZO#nq C  
    t1(j)=ts(j)*T(j); uWkn}P  
    tf(j)=filmtran(j,1)/100; y7T<Auue`  
    difference(j)=(t1(j)-tf(j))^2; ]-{A"tJ  
end VJSkQ\KD  
G=symsum(difference(j),1,401); %fIYWu`X  
G1=subs(G,n1,sym('x(1)')); FyWrb+_0v  
G2=subs(G1,n2,sym('x(2)')); &l~9FE*  
G3=subs(G2,k1,sym('x(3)')); E[Bj+mX9  
G4=subs(G3,k2,sym('x(4)')); XaH;  
G5=subs(G4,d,sym('x(5)'));  ay,"MJ2  
}t0JI3  
9;ie[sU:u  
UG=],\E2  
在matlab下运行 d Z}|G-:  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); ]92=PA>75  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); qoSZ+ khS$  
3oM&#a  
L}VQc9"gc  
结果出错如下： e
QJyO9$G  
;umbld0  
??? Conversion to double from sym is not possible. $msf~M*  
Error in ==> fminsearch at 175 -Yg?
@yt  
fv(:,1) = funfcn(x,varargin{:}); Ga\kvMtr  
%&!B2z}  
哪位高手给看看 ,[[Xo;q  

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。 DI=?{A  
ivvm.7{  
CK8!7=>}^  
万分感谢呀