[求助]fminsearch应用出错 [复制链接]

我的M文件如下： >tGl7Ov  
function [G5]=fun(x); MVDEVq0  
syms n1 n2 k1 k2 d; ip)gI&kN`z  
[subwave,nsub]=textread('subout.txt','%f %f'); J)I|Xot  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); L>@:Xo@  
[p,q]=size(subwave); o!$O+%4  
for j=1:p; 7gxC xfL$  
    wavel(j)=subwave(j,1); +0DPhc  
    n(j)=n1+n2/((wavel(j))^2); ,2>nr goM  
    k(j)=k1*exp(k2/wavel(j)); y*oH"]D  
    N(j)=n(j)-i*k(j); Q95`GuI@  
    phase(j)=2*pi*N(j)*d/wavel(j); MqKf'6z  
    ns(j)=nsub(j,1); vXI2u;=y  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); 6v
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    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); @a~GHG[x  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); P[q 'Y^\  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; ))9w)A@  
    t1(j)=ts(j)*T(j); _-6IB>  
    tf(j)=filmtran(j,1)/100; ^E]Xq]vd"  
    difference(j)=(t1(j)-tf(j))^2; ;:Kd?Tz$  
end -mfdngp3  
G=symsum(difference(j),1,401); k\/idd[  
G1=subs(G,n1,sym('x(1)')); e^%>_U  
G2=subs(G1,n2,sym('x(2)')); F'Lav?^  
G3=subs(G2,k1,sym('x(3)')); f5tkv<) %  
G4=subs(G3,k2,sym('x(4)')); (?W[#.=7  
G5=subs(G4,d,sym('x(5)')); D^-6=@<3KD  
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在matlab下运行 HzdyfZ!jR  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); mN^/  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); g#}a?kTM@  
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结果出错如下： N"k IQe*}1  
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??? Conversion to double from sym is not possible. ~E^lKe  
Error in ==> fminsearch at 175 t
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fv(:,1) = funfcn(x,varargin{:}); 31-:xUIX  
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哪位高手给看看 _$vAitUe4S  

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。 9]]isE8r  
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万分感谢呀