[求助]fminsearch应用出错 [复制链接]

我的M文件如下： /\_n5XI1  
function [G5]=fun(x); u;]xAr1  
syms n1 n2 k1 k2 d; ZW9OPwV  
[subwave,nsub]=textread('subout.txt','%f %f'); Y+o\?|q-E  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); Gov.;hy  
[p,q]=size(subwave); V%)Tu{L  
for j=1:p; mBJr*_p  
    wavel(j)=subwave(j,1); @e&0Wk  
    n(j)=n1+n2/((wavel(j))^2); 0)cSm"s  
    k(j)=k1*exp(k2/wavel(j)); 8MI8~
 
    N(j)=n(j)-i*k(j); liG|#ny{  
    phase(j)=2*pi*N(j)*d/wavel(j); [=BMvP5  
    ns(j)=nsub(j,1); Bu&9J(J1  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); z;dRzwL  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); +Z2XP76(4A  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); n((A:b  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; Y8^Wu
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    t1(j)=ts(j)*T(j); A^p{Cq@E  
    tf(j)=filmtran(j,1)/100; ^-Ygh[x  
    difference(j)=(t1(j)-tf(j))^2; K9.Gjw  
end :s&dn%5N"  
G=symsum(difference(j),1,401); _9t1aP5  
G1=subs(G,n1,sym('x(1)')); F~qZIggD  
G2=subs(G1,n2,sym('x(2)')); )`(]jx!  
G3=subs(G2,k1,sym('x(3)')); JBLUX,  
G4=subs(G3,k2,sym('x(4)')); yci}#,nb  
G5=subs(G4,d,sym('x(5)')); _{;_wwz  
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在matlab下运行 |dbKK\ X9  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); !zx8I7e4  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); mNacLkh[  
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结果出错如下： enZZ+|h  
p/RT*?<   
??? Conversion to double from sym is not possible. jwAYlnQ^EM  
Error in ==> fminsearch at 175 Q!qD3<?5  
fv(:,1) = funfcn(x,varargin{:}); !`RMXUV  
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哪位高手给看看 c?EvrtND  

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。
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万分感谢呀