[求助]fminsearch应用出错 [复制链接]

我的M文件如下： L{
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function [G5]=fun(x); Nt:8ogk/  
syms n1 n2 k1 k2 d; ~u&|G$1!0  
[subwave,nsub]=textread('subout.txt','%f %f'); ciMM^ZRIb  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); 8BXqZVm.  
[p,q]=size(subwave); 2 ?|gnbE:  
for j=1:p; V
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    wavel(j)=subwave(j,1); ;`v% sx#  
    n(j)=n1+n2/((wavel(j))^2); _7kM]">j  
    k(j)=k1*exp(k2/wavel(j)); +m,!e*g  
    N(j)=n(j)-i*k(j); *zVvQ=  
    phase(j)=2*pi*N(j)*d/wavel(j); "Vd_CO  
    ns(j)=nsub(j,1); K3mAXC,d  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); Zt@Z=r:&  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); 0nW F  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); Ep~wWQh  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; =y%rG :!  
    t1(j)=ts(j)*T(j); X6RQqen3:  
    tf(j)=filmtran(j,1)/100;
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    difference(j)=(t1(j)-tf(j))^2; 8 Op.eYe  
end o%y;(|4t >  
G=symsum(difference(j),1,401); ~ eN8|SR  
G1=subs(G,n1,sym('x(1)')); NvtM3  
G2=subs(G1,n2,sym('x(2)')); 8v yG*UK  
G3=subs(G2,k1,sym('x(3)')); 4p)e}W*  
G4=subs(G3,k2,sym('x(4)')); $T }Tz7(  
G5=subs(G4,d,sym('x(5)')); MZ#T^Y  
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在matlab下运行 %85Icg  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); dEp/dd~(&  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); (:\LWJX0=  
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结果出错如下： q42FPq  
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??? Conversion to double from sym is not possible. }fIqH4
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Error in ==> fminsearch at 175 lr('k`KO
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fv(:,1) = funfcn(x,varargin{:}); xRDiRj  
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哪位高手给看看 EychR/s  

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。 rveVCTbC  
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kl{6]39  
万分感谢呀