[求助]fminsearch应用出错 [复制链接]

我的M文件如下： cW~6@&
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function [G5]=fun(x); l7D4`i<F  
syms n1 n2 k1 k2 d; Lv,ji_  
[subwave,nsub]=textread('subout.txt','%f %f'); ~q#[5l(r8  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); 6>LQGO  
[p,q]=size(subwave); [X$|dOm'N  
for j=1:p; lo>-}xd  
    wavel(j)=subwave(j,1); ]'1N_m]?  
    n(j)=n1+n2/((wavel(j))^2); [6RV'7`Abj  
    k(j)=k1*exp(k2/wavel(j)); +lDGr/  
    N(j)=n(j)-i*k(j); !7,K9/"  
    phase(j)=2*pi*N(j)*d/wavel(j); 8Jib|#!  
    ns(j)=nsub(j,1); &ls
!IN  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); yaYIgG  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); {%+3D,$)  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); $S)e"Po~5  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; 2U
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    t1(j)=ts(j)*T(j); c@ZkX]g  
    tf(j)=filmtran(j,1)/100; =aCIaL&9Y  
    difference(j)=(t1(j)-tf(j))^2; *~t$k56  
end yw3U"/yw  
G=symsum(difference(j),1,401); b3 %&   
G1=subs(G,n1,sym('x(1)')); P7BJ?x  
G2=subs(G1,n2,sym('x(2)')); U7f&N  
G3=subs(G2,k1,sym('x(3)')); _uy5?auQ  
G4=subs(G3,k2,sym('x(4)')); z}b U\3!  
G5=subs(G4,d,sym('x(5)')); {7M4SC@p|  
hF=V
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在matlab下运行 wJ]$'c3  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); 6!}m$Dvt~  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); ~i_R%z:y  
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结果出错如下： sVm'9k  
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??? Conversion to double from sym is not possible. ~V$5m j  
Error in ==> fminsearch at 175 ^x1D]+  
fv(:,1) = funfcn(x,varargin{:}); I`n1M+=%  
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哪位高手给看看 j|$y)FBX  

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。 O9 Au =  
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万分感谢呀