[求助]fminsearch应用出错 [复制链接]

我的M文件如下： !JA63  
function [G5]=fun(x); |xOOdy6 )~  
syms n1 n2 k1 k2 d; LV0{~g(!%  
[subwave,nsub]=textread('subout.txt','%f %f'); *V}}3Degh  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); HN! l-z  
[p,q]=size(subwave); (;3jmdJhK  
for j=1:p; :OM>z4mQ  
    wavel(j)=subwave(j,1); ] $*cmk(Y  
    n(j)=n1+n2/((wavel(j))^2); t
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    k(j)=k1*exp(k2/wavel(j)); _{aVm&^kA  
    N(j)=n(j)-i*k(j); @lI/g  
    phase(j)=2*pi*N(j)*d/wavel(j); 9S^-qQH3}  
    ns(j)=nsub(j,1); l=yO]a\QZ  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); 60Z)AQs;+J  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); 1C{~!=6#  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); H#D=vx'  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; Ho/5e*X  
    t1(j)=ts(j)*T(j);  xMU)  
    tf(j)=filmtran(j,1)/100; DzEixE-  
    difference(j)=(t1(j)-tf(j))^2; ^B/{  
end n8Fi?/  
G=symsum(difference(j),1,401); -eya$C  
G1=subs(G,n1,sym('x(1)')); JkmL'Zk>:  
G2=subs(G1,n2,sym('x(2)')); W0|?R6|  
G3=subs(G2,k1,sym('x(3)')); ,LvJ'N  
G4=subs(G3,k2,sym('x(4)')); li[g =A,  
G5=subs(G4,d,sym('x(5)')); o0q{:An_Z  
=Ev } v  
%rsW:nl  
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在matlab下运行 wU3Q  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); wJ}8y4O!N  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); UcZ3v]$I  
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结果出错如下： Yr!3mU-Uvt  

9Y(<W_{/  
??? Conversion to double from sym is not possible. !O\r[c  
Error in ==> fminsearch at 175 *KMCU m  
fv(:,1) = funfcn(x,varargin{:}); R~b$7jpd  
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哪位高手给看看 ~I'hiV^-  

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。 r6A
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万分感谢呀