[求助]fminsearch应用出错 [复制链接]

我的M文件如下： j,|1y5f  
function [G5]=fun(x); )}k?r5g  
syms n1 n2 k1 k2 d; Y2=Brtc[@  
[subwave,nsub]=textread('subout.txt','%f %f'); m'Ekp  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); 9%3 r-U=  
[p,q]=size(subwave); }Ke}rM<  
for j=1:p; Kh:#S|
  
    wavel(j)=subwave(j,1); K\^&_#MG  
    n(j)=n1+n2/((wavel(j))^2); 68'-1}  
    k(j)=k1*exp(k2/wavel(j)); we:5gK&  
    N(j)=n(j)-i*k(j); `L"p)5H  
    phase(j)=2*pi*N(j)*d/wavel(j); m]-v IUpb  
    ns(j)=nsub(j,1); ;G4HMtL  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); 7/^TwNsv  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); 0XQ".:+h  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); r3c\;Ra7  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; r7Q:l ?F2  
    t1(j)=ts(j)*T(j); o/x5  
    tf(j)=filmtran(j,1)/100; A<YZBR_  
    difference(j)=(t1(j)-tf(j))^2; h87L8qh9  
end Zeme`/aBb  
G=symsum(difference(j),1,401); ]df9'\  
G1=subs(G,n1,sym('x(1)')); {x&jh|f`g  
G2=subs(G1,n2,sym('x(2)')); !dbA (  
G3=subs(G2,k1,sym('x(3)')); {0)WS}&  
G4=subs(G3,k2,sym('x(4)')); qa0JQ_?o]  
G5=subs(G4,d,sym('x(5)')); HjUw[Yz+6  
j;AzkReb  
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nIT^'  
在matlab下运行 l|ZzG4
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>> options=optimset('tolfun',1e-8,'tolx',1e-8); XD+cs.{5  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); I?>-  
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{M)3GsP?  
结果出错如下： -X&!dV:= 4  
U3_yEvZ  
??? Conversion to double from sym is not possible. uG(~m_7Hx  
Error in ==> fminsearch at 175 Z|Lh^G  
fv(:,1) = funfcn(x,varargin{:}); 3|83
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Zm; +Ku>  
哪位高手给看看 9$Pl'>5  

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。 #`vGg9  
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vn%U;}  
万分感谢呀