[求助]fminsearch应用出错 [复制链接]

我的M文件如下： "|L"C+
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function [G5]=fun(x); BzP,Tu{,  
syms n1 n2 k1 k2 d; \A"o[A2v  
[subwave,nsub]=textread('subout.txt','%f %f'); &(rWl`eTY`  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); ds(?:zx#  
[p,q]=size(subwave); hPDKxYD]f  
for j=1:p; ^AS\a4`/  
    wavel(j)=subwave(j,1); jdP
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    n(j)=n1+n2/((wavel(j))^2); jC9us>b  
    k(j)=k1*exp(k2/wavel(j)); 7{L4a\JzT  
    N(j)=n(j)-i*k(j); G @..?>  
    phase(j)=2*pi*N(j)*d/wavel(j); Ki\.w~Qs  
    ns(j)=nsub(j,1); t'vt'[~,U  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); P5h|* ?=  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); %w*)7@,+-  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); ttzNv>L,  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; l%0bF9\  
    t1(j)=ts(j)*T(j); ff\~`n~WZ  
    tf(j)=filmtran(j,1)/100; t'rN7.d  
    difference(j)=(t1(j)-tf(j))^2; d,b4q&^X8  
end ZgP%sF  
G=symsum(difference(j),1,401); 4Z( #;9f  
G1=subs(G,n1,sym('x(1)')); GiV%Hcx  
G2=subs(G1,n2,sym('x(2)')); &X$T "Dp  
G3=subs(G2,k1,sym('x(3)')); }}JMwT  
G4=subs(G3,k2,sym('x(4)')); {r,Uik-nL  
G5=subs(G4,d,sym('x(5)')); ;*<tU n^t  
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在matlab下运行 jwDlz.sW!  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); _FY&XL=  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); <'a~Y3B"o  
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结果出错如下： !Zz;;Z  
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??? Conversion to double from sym is not possible. *@2Bh4  
Error in ==> fminsearch at 175 9%/hoA)  
fv(:,1) = funfcn(x,varargin{:}); 9y7N}T6  
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哪位高手给看看 :Ha/^cC/3  

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。 N9e'jM>Oos  
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万分感谢呀