[求助]fminsearch应用出错 [复制链接]

我的M文件如下： vC>2%Zgf-  
function [G5]=fun(x); DgcS@N  
syms n1 n2 k1 k2 d; (${
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[subwave,nsub]=textread('subout.txt','%f %f'); }=v4(M`%  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); V-#JV@b  
[p,q]=size(subwave); IrZ\;!NK  
for j=1:p; 'cc8xC  
    wavel(j)=subwave(j,1); .gfi9J  
    n(j)=n1+n2/((wavel(j))^2); uMva5o  
    k(j)=k1*exp(k2/wavel(j)); 6
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    N(j)=n(j)-i*k(j); *#>(P  
    phase(j)=2*pi*N(j)*d/wavel(j); PEEaNOk 1b  
    ns(j)=nsub(j,1); 8/j|=Q,5  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); r
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    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); QAx9W%  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); :k?`gm$  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; 75p9_)>96  
    t1(j)=ts(j)*T(j); sXEIC#rq  
    tf(j)=filmtran(j,1)/100; Q e+;BE-H  
    difference(j)=(t1(j)-tf(j))^2; 2;T?ry7  
end 'lE{Nj*7  
G=symsum(difference(j),1,401); I~F&@  
G1=subs(G,n1,sym('x(1)')); bC+ZR{M  
G2=subs(G1,n2,sym('x(2)')); Czw]5  
G3=subs(G2,k1,sym('x(3)')); zqt<[=O  
G4=subs(G3,k2,sym('x(4)')); cO{NiRIb  
G5=subs(G4,d,sym('x(5)')); kwUUv
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在matlab下运行 J?TCP%  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); K_Y{50#  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); B!J?,SB  
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结果出错如下： tH;9"z# ~  
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??? Conversion to double from sym is not possible. 9;XbyA]  
Error in ==> fminsearch at 175 :I7qw0?  
fv(:,1) = funfcn(x,varargin{:}); $:5h5Y#z  
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哪位高手给看看 <w}i  

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。 b/\O;o}]  
3F;0a ;[  
l2W+VBn6  
万分感谢呀