[求助]fminsearch应用出错 [复制链接]

我的M文件如下： &W>\Vl1  
function [G5]=fun(x); 1HO;~NJ]m  
syms n1 n2 k1 k2 d; S
5JMt;O  
[subwave,nsub]=textread('subout.txt','%f %f'); )Cdw_Yx  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); vEx'~_+a9  
[p,q]=size(subwave); fExFpR,`  
for j=1:p; Ihf>FMl:  
    wavel(j)=subwave(j,1); J0Yb_(w  
    n(j)=n1+n2/((wavel(j))^2); <7y/)b@  
    k(j)=k1*exp(k2/wavel(j)); gbMA-r:IC  
    N(j)=n(j)-i*k(j); {U-
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    phase(j)=2*pi*N(j)*d/wavel(j); ?*V\ -7jg  
    ns(j)=nsub(j,1); 1V`-D8-?  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); B\ 'rxbH  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); d
\qszYP[  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); v^eAQoFLhN  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; ;^:8F  
    t1(j)=ts(j)*T(j); GpPM?  
    tf(j)=filmtran(j,1)/100; 6`2i'flv  
    difference(j)=(t1(j)-tf(j))^2; OX.5olb  
end yPmo1|'X>d  
G=symsum(difference(j),1,401); \2u7>fU!  
G1=subs(G,n1,sym('x(1)')); &</)k|.A6\  
G2=subs(G1,n2,sym('x(2)')); 1a9' *[  
G3=subs(G2,k1,sym('x(3)')); -)%\$z  
G4=subs(G3,k2,sym('x(4)')); Sck!w 3  
G5=subs(G4,d,sym('x(5)')); Vw;iE=L  
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在matlab下运行 zji9\  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); Ip{hg,>  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); =9,mt K~  
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结果出错如下： 9V)c
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??? Conversion to double from sym is not possible. )T '?"guh`  
Error in ==> fminsearch at 175 X%-"b`  
fv(:,1) = funfcn(x,varargin{:}); TS#1+f]9J<  
3
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哪位高手给看看 G l/3*J  

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。 4Tuh]5  
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万分感谢呀