[求助]fminsearch应用出错 [复制链接]

我的M文件如下： aY^_+&&G  
function [G5]=fun(x); ] ~;x$Z)  
syms n1 n2 k1 k2 d; ";jj`  
[subwave,nsub]=textread('subout.txt','%f %f'); #6])\  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); &zl=}xeA  
[p,q]=size(subwave); 80X #V  
for j=1:p; <&n\)R4C1  
    wavel(j)=subwave(j,1); gbP]!d:I  
    n(j)=n1+n2/((wavel(j))^2); 6 ufF34tA  
    k(j)=k1*exp(k2/wavel(j)); [25[c><:w"  
    N(j)=n(j)-i*k(j); B~/:["zTh&  
    phase(j)=2*pi*N(j)*d/wavel(j); |1sl>X,  
    ns(j)=nsub(j,1); &E0d{2  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); !J3dlUFRO  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); 2}Ga  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); }9w?[hXW"  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; {rQSB;3  
    t1(j)=ts(j)*T(j); X.u&4SH  
    tf(j)=filmtran(j,1)/100; 3P{ d~2  
    difference(j)=(t1(j)-tf(j))^2; U)Cv_qe  
end 89*txYmx  
G=symsum(difference(j),1,401); R`? '|G]P  
G1=subs(G,n1,sym('x(1)')); Z=VAjJ;i[  
G2=subs(G1,n2,sym('x(2)')); ~YQC!x  
G3=subs(G2,k1,sym('x(3)')); {)E)&lL  
G4=subs(G3,k2,sym('x(4)')); clE_a?  
G5=subs(G4,d,sym('x(5)')); *VJT]^_  
?P<8Zw
 
A*;I}F  
 V6opV&  
在matlab下运行 p.(8ekh  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); U?vG?{A  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); Ce:2Tw  
A~MAaw!YE  
ulY8$jB  
结果出错如下： Mf7Z5  
ZbmBwW_ 7  
??? Conversion to double from sym is not possible. [1OX:O|  
Error in ==> fminsearch at 175 * z,] mi%  
fv(:,1) = funfcn(x,varargin{:}); '@~\(SH  
F+%6?2J  
哪位高手给看看 Fjq~^_8  

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。 Xs,[Z2_iq  
J5i$D
0K[  
u~JCMM$  
万分感谢呀