[求助]fminsearch应用出错 [复制链接]

我的M文件如下： Xq@Bzya  
function [G5]=fun(x); wQEsq<  
syms n1 n2 k1 k2 d; kc-=5l  
[subwave,nsub]=textread('subout.txt','%f %f'); .J"QW~g^  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); |6v $!wBi  
[p,q]=size(subwave); F2QFQX(j  
for j=1:p; x+EkL3{  
    wavel(j)=subwave(j,1); u%!/-&?wF  
    n(j)=n1+n2/((wavel(j))^2); ;G.5.q[A  
    k(j)=k1*exp(k2/wavel(j)); ^CO{86V  
    N(j)=n(j)-i*k(j); J}BN}|Y@2  
    phase(j)=2*pi*N(j)*d/wavel(j); E2K{9@i  
    ns(j)=nsub(j,1); ;-#2p^  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); -M5vh~Tp  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); /W9(}Id6  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); {7'Wi$^F  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; ;x%"o[[>  
    t1(j)=ts(j)*T(j); /#jH#f[  
    tf(j)=filmtran(j,1)/100; 0$JH5RC  
    difference(j)=(t1(j)-tf(j))^2; `,QcOkvbC  
end KW-GVe%8f  
G=symsum(difference(j),1,401); |W_;L6)  
G1=subs(G,n1,sym('x(1)')); 2,aH1Xbex  
G2=subs(G1,n2,sym('x(2)')); o=J-Ju
 
G3=subs(G2,k1,sym('x(3)')); s|IY t^  
G4=subs(G3,k2,sym('x(4)')); *IX<&u#  
G5=subs(G4,d,sym('x(5)')); _NefzZWUJ  
!6!Gx:  
)G#mC0?PV  
=' uePM")  
在matlab下运行 *:bexDH  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); bd]9kRq1K  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); 0vX4v)-^u  
JTIt!E}P  
;/:Sx/#s  
结果出错如下： "i#aII+T  
0civXZgj  
??? Conversion to double from sym is not possible. \?SvO  
Error in ==> fminsearch at 175 <qg4Rz\c]  
fv(:,1) = funfcn(x,varargin{:}); TZ *>MySiF  
G/*;h,NbNr  
哪位高手给看看 pHT]2e#  

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。 P q$0ih  
l+[:Cni  
x-"8V(  
万分感谢呀