[求助]fminsearch应用出错 [复制链接]

我的M文件如下： W9?Vh{w  
function [G5]=fun(x); @twClk.s  
syms n1 n2 k1 k2 d; `|;R}"R;  
[subwave,nsub]=textread('subout.txt','%f %f'); Y`3>i,S6\  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); 0zaE?dA]  
[p,q]=size(subwave); wg*2mo  
for j=1:p;
0Q=4{*:?  
    wavel(j)=subwave(j,1); l=ZhHON  
    n(j)=n1+n2/((wavel(j))^2); ]dc^@}1bN  
    k(j)=k1*exp(k2/wavel(j)); k9.2*+vvg  
    N(j)=n(j)-i*k(j); 0I4RZ.2*Y  
    phase(j)=2*pi*N(j)*d/wavel(j); s3W)hU)  
    ns(j)=nsub(j,1); Qj?FUxw  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); DGTSk9iK(  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); k#%BxT  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); mV} peb  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; 2`Xy}9N/Y  
    t1(j)=ts(j)*T(j); x5k6yHn  
    tf(j)=filmtran(j,1)/100; ~&=-*  
    difference(j)=(t1(j)-tf(j))^2; #n7uw  
end TDdFuO'}  
G=symsum(difference(j),1,401); GH![rK  
G1=subs(G,n1,sym('x(1)')); ";cWK29\f  
G2=subs(G1,n2,sym('x(2)')); C$x
U!9K[+  
G3=subs(G2,k1,sym('x(3)')); *Y6BPFE*4  
G4=subs(G3,k2,sym('x(4)')); GmB7@-[QA%  
G5=subs(G4,d,sym('x(5)')); yK<%AV@v  

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im
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在matlab下运行 P7(+{d{  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); veg\A+:'  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); _H|x6X1-  
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T%Vii*?M  
结果出错如下： HiEXw}Hkz  
[L8Bgw1  
??? Conversion to double from sym is not possible. !MNUp(:  
Error in ==> fminsearch at 175 [>Kkj;*  
fv(:,1) = funfcn(x,varargin{:}); xCD|UC46?X  
E% Ce/n  
哪位高手给看看 W\o(f W  

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。 f2B?Zn  
V= U=  
B@` 87  
万分感谢呀