[求助]fminsearch应用出错 [复制链接]

我的M文件如下： u;Z~Px4]v  
function [G5]=fun(x); XDI@mQmzB  
syms n1 n2 k1 k2 d; c^=,@#  
[subwave,nsub]=textread('subout.txt','%f %f'); 3F4I{L  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); P"xP%zqo  
[p,q]=size(subwave);
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for j=1:p;
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    wavel(j)=subwave(j,1); "C0oFRk  
    n(j)=n1+n2/((wavel(j))^2); : 0%V:B  
    k(j)=k1*exp(k2/wavel(j)); U|y+k`  
    N(j)=n(j)-i*k(j); A!j&g(Z"Q  
    phase(j)=2*pi*N(j)*d/wavel(j); cy}2~w&s4  
    ns(j)=nsub(j,1); '7E?|B0],  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); {WC{T2:8  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); QGYmQ9m{kL  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); #=zh&`  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2;
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    t1(j)=ts(j)*T(j); &]ImO RN  
    tf(j)=filmtran(j,1)/100; fYH%vr)  
    difference(j)=(t1(j)-tf(j))^2; av5lgv)3  
end 1YS{; y[o  
G=symsum(difference(j),1,401); e<IT2tv>u  
G1=subs(G,n1,sym('x(1)')); hZyz5aZ)K  
G2=subs(G1,n2,sym('x(2)')); [1Vh3~>J6  
G3=subs(G2,k1,sym('x(3)')); \6sp"KqP  
G4=subs(G3,k2,sym('x(4)')); P [gqv3V  
G5=subs(G4,d,sym('x(5)')); ,rG$JCS'KQ  
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在matlab下运行 ^(a%B  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); Z!ub`coV[  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); QZd ,GY5{  
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结果出错如下： #Ok*Or  
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??? Conversion to double from sym is not possible. 'GNT'y_  
Error in ==> fminsearch at 175 &%INfl>o7.  
fv(:,1) = funfcn(x,varargin{:}); <G#JPt6  
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哪位高手给看看 ~KCOCtiD  

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。 qifX7AXHr  
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万分感谢呀