[求助]fminsearch应用出错 [复制链接]

我的M文件如下： X
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function [G5]=fun(x); '"Gi&:*nQ<  
syms n1 n2 k1 k2 d; ; V8 =B8w  
[subwave,nsub]=textread('subout.txt','%f %f'); gC.T
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[filmwave,filmtran]=textread('filmtr.dat','%f %f'); 4j5plm=  
[p,q]=size(subwave); NT0q!r/!  
for j=1:p; %0QYkHdFR`  
    wavel(j)=subwave(j,1); E),T,  
    n(j)=n1+n2/((wavel(j))^2); t [f]  
    k(j)=k1*exp(k2/wavel(j)); &I8ZVtg  
    N(j)=n(j)-i*k(j); ~Q5HM  
    phase(j)=2*pi*N(j)*d/wavel(j); QMP:}  
    ns(j)=nsub(j,1); %?ad.F+7  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); p6p_B  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); !WNr09`  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); E@p9vf->  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; u56cT/J1  
    t1(j)=ts(j)*T(j); G6FknYj  
    tf(j)=filmtran(j,1)/100; rnUe/HjH  
    difference(j)=(t1(j)-tf(j))^2; \TjsXy=:)  
end "Z <1Msz  
G=symsum(difference(j),1,401); L,$9)`j  
G1=subs(G,n1,sym('x(1)')); ;IyQqP#,<  
G2=subs(G1,n2,sym('x(2)')); p)`JVq,H/B  
G3=subs(G2,k1,sym('x(3)')); G9;WO*  
G4=subs(G3,k2,sym('x(4)')); :7gIm|2"]  
G5=subs(G4,d,sym('x(5)')); L fhd02  
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在matlab下运行 ~O!v?2it8q  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); [1Rs~T"  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); tG'c79D\  
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结果出错如下： GKX#-zsh79  
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??? Conversion to double from sym is not possible. #-{4F?DA]y  
Error in ==> fminsearch at 175 D?$f[+  
fv(:,1) = funfcn(x,varargin{:}); RaR$lcG+iY  
ral0@\T  
哪位高手给看看 -70Ut 4B  

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。 F[LBQI`zq  
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万分感谢呀