[求助]fminsearch应用出错 [复制链接]

我的M文件如下： 2C "=!'  
function [G5]=fun(x); isK;mU?<  
syms n1 n2 k1 k2 d; 5M){!8"S)#  
[subwave,nsub]=textread('subout.txt','%f %f'); [_!O<z_sB  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); Vz:_mKA  
[p,q]=size(subwave); 1mW%  
for j=1:p; p^QZq>v  
    wavel(j)=subwave(j,1); h=+$>_&:  
    n(j)=n1+n2/((wavel(j))^2); Y 62r  
    k(j)=k1*exp(k2/wavel(j)); H{zPft  
    N(j)=n(j)-i*k(j); *|RS*ABte  
    phase(j)=2*pi*N(j)*d/wavel(j); P]6}\ ]~  
    ns(j)=nsub(j,1); W|R-J  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); wGLF%;rRe4  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); N6/T#UVns  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); ltA/  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; JOfV]eCL  
    t1(j)=ts(j)*T(j); %}qbkkZ  
    tf(j)=filmtran(j,1)/100; 8Qrpa o  
    difference(j)=(t1(j)-tf(j))^2; (6qsKX  
end nX5C<Ky  
G=symsum(difference(j),1,401); ^ddO&!U  
G1=subs(G,n1,sym('x(1)')); TSto9$}*  
G2=subs(G1,n2,sym('x(2)')); lOerrP6f(  
G3=subs(G2,k1,sym('x(3)')); 

Pl  
G4=subs(G3,k2,sym('x(4)')); 8vD3=yK%^  
G5=subs(G4,d,sym('x(5)')); ok0X<MR!I  
TQ'E5^  
optBA3@e!  
j\2[H^   
在matlab下运行 32>x^>G=>  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); h)dRR_  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); 2
p< Aj!  
nX[;^v/  
Sb"2Im>  
结果出错如下： g(m_yXIx  
C0m\SNR  
??? Conversion to double from sym is not possible. BQ
Np$]5s  
Error in ==> fminsearch at 175 ~j&?/{7I  
fv(:,1) = funfcn(x,varargin{:}); *\ECf.7jz  
MCy~@)-IN  
哪位高手给看看 <DmTj$  

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。 ^k72{ 3N(  
GX38~pq  
8
/m3+5  
万分感谢呀