[求助]fminsearch应用出错 [复制链接]

我的M文件如下： *bUOd'vh  
function [G5]=fun(x); uw(Ml=  
syms n1 n2 k1 k2 d; m@2=vq1f  
[subwave,nsub]=textread('subout.txt','%f %f'); c-U]3`;Q  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); 1 ]ePU8  
[p,q]=size(subwave); YKzfI9Y  
for j=1:p; 8Yo;oHk7  
    wavel(j)=subwave(j,1); l[C_vUg  
    n(j)=n1+n2/((wavel(j))^2); O
+]'*~a  
    k(j)=k1*exp(k2/wavel(j)); uZ'(fn
Z$  
    N(j)=n(j)-i*k(j); &joP-!"  
    phase(j)=2*pi*N(j)*d/wavel(j); OxUc,%e9P  
    ns(j)=nsub(j,1); p-
H}NQ\  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); 9+ |W;  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); NDJP`FI  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); ^ 4*#QtO  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; |XV`A)=f  
    t1(j)=ts(j)*T(j); t<"%m)J  
    tf(j)=filmtran(j,1)/100; 4gZ)9ya  
    difference(j)=(t1(j)-tf(j))^2; RwhKW?r+  
end 2w fkXS=~6  
G=symsum(difference(j),1,401); T8d=@8g,%  
G1=subs(G,n1,sym('x(1)')); _%#Uh#7P$  
G2=subs(G1,n2,sym('x(2)')); )TEod!]  
G3=subs(G2,k1,sym('x(3)')); bz.sWBugR  
G4=subs(G3,k2,sym('x(4)')); uPE Ab2u="  
G5=subs(G4,d,sym('x(5)')); V Ds0+RC  
M{SJ8+G  
3#y`6e=5  
`G%h=rr^c  
在matlab下运行 !M(SEIc4A  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); JP^\  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); Ao#bREm  
Rtlc&Q.b  
|>'q%xK  
结果出错如下： CeM%?fr5  
}pGjc_:']  
??? Conversion to double from sym is not possible. "=LeHY=9  
Error in ==> fminsearch at 175 K(HrwH`a{  
fv(:,1) = funfcn(x,varargin{:}); ;#mm_*L%@  
~+V$0Q;L  
哪位高手给看看 ^E.mG>
 

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。 <N>7.G  
V]m}xZ'?^  
S!b?pl  
万分感谢呀