[求助]fminsearch应用出错 [复制链接]

我的M文件如下： ;1AG3P'  
function [G5]=fun(x); D}mL7d1  
syms n1 n2 k1 k2 d; pNaiXu3  
[subwave,nsub]=textread('subout.txt','%f %f'); IfdI|ya  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); >O`l8tM  
[p,q]=size(subwave); "u^EleE!  
for j=1:p; ?^!,vh  
    wavel(j)=subwave(j,1); X~T/qFS  
    n(j)=n1+n2/((wavel(j))^2); _cI_#  
    k(j)=k1*exp(k2/wavel(j)); C*Vd-U  
    N(j)=n(j)-i*k(j); %FkLQ+v/<  
    phase(j)=2*pi*N(j)*d/wavel(j); .=RlOK  
    ns(j)=nsub(j,1); F}?<v8#z0  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); NC23Z0y  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j));
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    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); T3J'fjY  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; $K}. +`vVO  
    t1(j)=ts(j)*T(j); oY9FK{  
    tf(j)=filmtran(j,1)/100; 5fjd{Y[k  
    difference(j)=(t1(j)-tf(j))^2; +=@
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end .QWhK|(.!  
G=symsum(difference(j),1,401); j.?:Gaab?#  
G1=subs(G,n1,sym('x(1)')); -$8.3\6h  
G2=subs(G1,n2,sym('x(2)')); D9ufoa&ua  
G3=subs(G2,k1,sym('x(3)')); u</8w&!  
G4=subs(G3,k2,sym('x(4)')); fZryG  
G5=subs(G4,d,sym('x(5)')); 3!9Z=-tD  
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j+ ::y) $  
在matlab下运行 pK_?}~  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); _2Py\+$  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); d.F)9h]XHO  
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结果出错如下： , |E$'  
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??? Conversion to double from sym is not possible. o \L!(hm  
Error in ==> fminsearch at 175 #;r
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fv(:,1) = funfcn(x,varargin{:}); 2Oc$+St~8  
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哪位高手给看看 %e%7oqR?  

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。 pO/%N94s  
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万分感谢呀