[求助]fminsearch应用出错 [复制链接]

我的M文件如下： \V'fB5  
function [G5]=fun(x); &(<>} r  
syms n1 n2 k1 k2 d; ri-&3%%z<  
[subwave,nsub]=textread('subout.txt','%f %f'); a9&[Qv5-/  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); Uy=yA  
[p,q]=size(subwave); a 7v^o`  
for j=1:p; *# <%04f  
    wavel(j)=subwave(j,1); KiG
19R$  
    n(j)=n1+n2/((wavel(j))^2); >#n"r1  
    k(j)=k1*exp(k2/wavel(j)); An>ai N
]  
    N(j)=n(j)-i*k(j); t0c
S.hi  
    phase(j)=2*pi*N(j)*d/wavel(j); 2Rys:$  
    ns(j)=nsub(j,1); \6GNKeN  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); 6{d?3Jk  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); +uF}mZS^  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); 5f_x.~ymA  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; ~c&sr5E  
    t1(j)=ts(j)*T(j); O6e$vI@  
    tf(j)=filmtran(j,1)/100; `dF~'  
    difference(j)=(t1(j)-tf(j))^2; #5y+gdN  
end V1P]pP  
G=symsum(difference(j),1,401); &b~X&{3,  
G1=subs(G,n1,sym('x(1)')); yLqhj7  
G2=subs(G1,n2,sym('x(2)')); Otr=+i ZI  
G3=subs(G2,k1,sym('x(3)')); ]~$@x=p2e  
G4=subs(G3,k2,sym('x(4)')); B}NJs,'FJ  
G5=subs(G4,d,sym('x(5)')); Uth+4A
q  
q%k&O9C2]  
Q2oo\  
PC"=B[OlJ  
在matlab下运行 !m=Js"  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); B
bFLT@W4  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); q%bFR[p<*  
K_t >T)K  
T/u61}'U{  
结果出错如下： iiuT:r  

~%tVb c  
??? Conversion to double from sym is not possible. {8":cn j  
Error in ==> fminsearch at 175 Uun0FCA>  
fv(:,1) = funfcn(x,varargin{:}); 1Cc91  
D:K"J><@
 
哪位高手给看看 X9c<g;  

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。 1foG*  
r1.zURY  
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万分感谢呀