[求助]fminsearch应用出错 [复制链接]

我的M文件如下： c>RS~/Y  
function [G5]=fun(x); c)fTI,.$  
syms n1 n2 k1 k2 d; #x|h@(y|  
[subwave,nsub]=textread('subout.txt','%f %f'); n~k9Z^ $  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); g4^df%)&  
[p,q]=size(subwave); *.9.BD9  
for j=1:p; "J%/xj
 
    wavel(j)=subwave(j,1); 3pKr {U92  
    n(j)=n1+n2/((wavel(j))^2); w/HGmVa  
    k(j)=k1*exp(k2/wavel(j)); =-dk@s  
    N(j)=n(j)-i*k(j); rz%=qY  
    phase(j)=2*pi*N(j)*d/wavel(j); &Q"Ox{~W  
    ns(j)=nsub(j,1); Jm8#M z  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); nAJ<@a  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); @cZNoD  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); ISuye2tExq  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; QeVM9br)m  
    t1(j)=ts(j)*T(j); $=GZ
"%ED  
    tf(j)=filmtran(j,1)/100; k%Q>lf<e   
    difference(j)=(t1(j)-tf(j))^2; vxzOG?Xc:  
end QNH5Cq;Y  
G=symsum(difference(j),1,401); w;(`!^xv  
G1=subs(G,n1,sym('x(1)')); =@>[  
G2=subs(G1,n2,sym('x(2)')); qE`  
G3=subs(G2,k1,sym('x(3)')); 7uQ-:n  
G4=subs(G3,k2,sym('x(4)')); *gC6yQ2?  
G5=subs(G4,d,sym('x(5)')); 6 2r%q^r`i  
u@$C i/J*  
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在matlab下运行 +SSF=]4+  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); ;$\d^i{N  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); )MZQ\8,)]  
FU|c[u|z  
KN;b+`x;M  
结果出错如下： n^;:V8k  
Ii,Lj1Q  
??? Conversion to double from sym is not possible. b:nHcxDU<  
Error in ==> fminsearch at 175 ?2;r#)  
fv(:,1) = funfcn(x,varargin{:}); f`?Y+nu}  
3!0Eh8ncI  
哪位高手给看看 A({8p  

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。 wY2#xD  
WKFmU0RK  
\w!G  
万分感谢呀