[求助]fminsearch应用出错 [复制链接]

我的M文件如下： YA@MLZm  
function [G5]=fun(x); XmD(&3;v-  
syms n1 n2 k1 k2 d; obE8iG@H  
[subwave,nsub]=textread('subout.txt','%f %f'); Pz34a@%"  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); HCsd$M;Hbv  
[p,q]=size(subwave); m~ 5"q%;  
for j=1:p; 5JhvYsf3_  
    wavel(j)=subwave(j,1); PW|=I
PS  
    n(j)=n1+n2/((wavel(j))^2); S2DG=hi`GK  
    k(j)=k1*exp(k2/wavel(j)); mogmr  
    N(j)=n(j)-i*k(j); 5RvE ),  
    phase(j)=2*pi*N(j)*d/wavel(j); zz[fkH3  
    ns(j)=nsub(j,1); N2k<W?wQ  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); 4e/!BGkAS  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); rf-yUH]&S  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); =Q{?!  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; Xp_m=QQsm  
    t1(j)=ts(j)*T(j); SkMFJ?J/  
    tf(j)=filmtran(j,1)/100; [al$sCD]+  
    difference(j)=(t1(j)-tf(j))^2; ;1[Z&Uv8  
end 04jvrde8-O  
G=symsum(difference(j),1,401); /q+;!E
M  
G1=subs(G,n1,sym('x(1)')); +}N'Xa/Jt  
G2=subs(G1,n2,sym('x(2)')); $&&E[JY  
G3=subs(G2,k1,sym('x(3)')); |ZE^'e*k  
G4=subs(G3,k2,sym('x(4)')); WB?HY?[r  
G5=subs(G4,d,sym('x(5)')); .=9WY_@SZ  
;:j1FOj  
j{YYG|  
~x!up9  
在matlab下运行 `:Gzjngc  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); PBnH#zm  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); u1L^INo/  
h Fik>B#!  
GkX Se)#p  
结果出错如下： &n )MGg1%  
ZaU8eg7  
??? Conversion to double from sym is not possible. 3PGAUQR#"q  
Error in ==> fminsearch at 175 6IG?t  
fv(:,1) = funfcn(x,varargin{:}); 6_4B!  
BH1h2OEe#  
哪位高手给看看 w+>+hq  

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。 UMR?q0J  
>< $LV&  
 d(o=)!p  
万分感谢呀