[求助]fminsearch应用出错 [复制链接]

我的M文件如下： <m)@~s?D  
function [G5]=fun(x); E~N}m7kTl/  
syms n1 n2 k1 k2 d; d[O.UzQ  
[subwave,nsub]=textread('subout.txt','%f %f'); +'lfW{E1t  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); ?!A{n3\<  
[p,q]=size(subwave); P@*whjPmo  
for j=1:p; vWj|[| <rX  
    wavel(j)=subwave(j,1); IHB{US1G  
    n(j)=n1+n2/((wavel(j))^2); 5gEUE{S  
    k(j)=k1*exp(k2/wavel(j)); OSq"q-Q  
    N(j)=n(j)-i*k(j); X59~)rH,  
    phase(j)=2*pi*N(j)*d/wavel(j); )IhI~,0Nmj  
    ns(j)=nsub(j,1); v,2{Vr  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); Ymn0?$,D1=  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); W=G[hT5L{  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); 6lZhV[~Z/  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; o#6j+fo!n  
    t1(j)=ts(j)*T(j); IS8ppu&E  
    tf(j)=filmtran(j,1)/100; ea B-u  
    difference(j)=(t1(j)-tf(j))^2; ]54V9l:  
end 
mNuv>GAb  
G=symsum(difference(j),1,401); Ct.Q)p-wn  
G1=subs(G,n1,sym('x(1)')); SM@1<OCc  
G2=subs(G1,n2,sym('x(2)')); FTk!Mn88  
G3=subs(G2,k1,sym('x(3)')); YZmD:P  
G4=subs(G3,k2,sym('x(4)')); 5[;p<GqGN  
G5=subs(G4,d,sym('x(5)')); rL_AqSGAK1  
]Oe#S"-Oo  
8"p>_K=  
Uu3[Cf=C  
在matlab下运行 ZT|
E1[Q  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); !O$EVl  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); +]I7)  
Ig S.U  
:~`E@`/  
结果出错如下：
<.=  
``zg |h  
??? Conversion to double from sym is not possible. 7';PI!$  
Error in ==> fminsearch at 175 YK_a37E{F  
fv(:,1) = funfcn(x,varargin{:}); UT>\u
 
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哪位高手给看看 69CH 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。 [NH[n#  
8[xb+_  
+tlTHK  
万分感谢呀