[求助]fminsearch应用出错 [复制链接]

我的M文件如下： D';eTy Y  
function [G5]=fun(x); GQ_Ia\  
syms n1 n2 k1 k2 d; +7}iu/B!9  
[subwave,nsub]=textread('subout.txt','%f %f'); @o
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[filmwave,filmtran]=textread('filmtr.dat','%f %f'); f*xpE`&  
[p,q]=size(subwave); (!?K7<Jv  
for j=1:p; \0FT!} L  
    wavel(j)=subwave(j,1); Rn+4DcR  
    n(j)=n1+n2/((wavel(j))^2); l)+:4N?iVv  
    k(j)=k1*exp(k2/wavel(j)); sNU}n<J-  
    N(j)=n(j)-i*k(j); }lZ>  
    phase(j)=2*pi*N(j)*d/wavel(j); yy(A(}  
    ns(j)=nsub(j,1); +1;'B4  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); {b!7 .Cd=  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); 84&XW  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); ,7d|O}B  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; l*7?Y7FK  
    t1(j)=ts(j)*T(j); x|~zHFm6  
    tf(j)=filmtran(j,1)/100; mxqG-*ch-  
    difference(j)=(t1(j)-tf(j))^2; ]y1fM0  
end $;D* n'8Fx  
G=symsum(difference(j),1,401); '=cKU0 G#  
G1=subs(G,n1,sym('x(1)')); ~S(^T9R  
G2=subs(G1,n2,sym('x(2)')); #2%([w  
G3=subs(G2,k1,sym('x(3)')); keqcV23k  
G4=subs(G3,k2,sym('x(4)')); %c6E-4b  
G5=subs(G4,d,sym('x(5)')); 0-2"FdeQU  
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ms~8QL  
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在matlab下运行 ;rBp1[qVe  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); (v#pj8aE  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); cBEHH4U  
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MC=G"m:_  
结果出错如下： hG Apuy  
RIhOR8)  
??? Conversion to double from sym is not possible. &2.+Igo|G  
Error in ==> fminsearch at 175 # .q#OC  
fv(:,1) = funfcn(x,varargin{:}); OV5e#AOy)  
J4yt N3  
哪位高手给看看 ,86K  

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。 Bxv8RB  
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万分感谢呀