[求助]fminsearch应用出错 [复制链接]

我的M文件如下： o^biO!4,  
function [G5]=fun(x); 8nW#Q<s  
syms n1 n2 k1 k2 d; Mvu!  
[subwave,nsub]=textread('subout.txt','%f %f'); % ?@PlQ  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); S+7>Y? B!  
[p,q]=size(subwave); slXk <  
for j=1:p; Y}Y2Vx  
    wavel(j)=subwave(j,1); ?tSFM:9PU  
    n(j)=n1+n2/((wavel(j))^2); y.H
E3tH  
    k(j)=k1*exp(k2/wavel(j)); vA*!82  
    N(j)=n(j)-i*k(j); d?.e
wsC  
    phase(j)=2*pi*N(j)*d/wavel(j); {b}Ri&oEOH  
    ns(j)=nsub(j,1); b~z1%?  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); n'K,*  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); k&
2U&  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); c\065#f!  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; 4,`Yx s)%  
    t1(j)=ts(j)*T(j); p$0G EYwM  
    tf(j)=filmtran(j,1)/100; N[~RWg  
    difference(j)=(t1(j)-tf(j))^2; H_un3x1  
end GFB(c  
G=symsum(difference(j),1,401); [8v v[n/  
G1=subs(G,n1,sym('x(1)')); )k&<D*5s  
G2=subs(G1,n2,sym('x(2)')); E.R,'Y;x  
G3=subs(G2,k1,sym('x(3)')); P{h;2b{  
G4=subs(G3,k2,sym('x(4)')); %A|9=x*  
G5=subs(G4,d,sym('x(5)')); f![?og)I%  
g ]e^;  
IVjH.BzH9  
40w,:$  
在matlab下运行 v[E*K@6f  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); d,tGW  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); b3N1SC:Wn  
4V@raI-  
d="Oge8  
结果出错如下： MqDz cB]  
&Op_!]8`U  
??? Conversion to double from sym is not possible. B4Ko,=pg  
Error in ==> fminsearch at 175 JR] /\(  
fv(:,1) = funfcn(x,varargin{:}); G:7HL5u  
5|z>_f.^pS  
哪位高手给看看 roSdcQTeT  

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。 Xo[j*<=0  
R!{^qHb  
<q\OREMsq  
万分感谢呀