[求助]fminsearch应用出错 [复制链接]

我的M文件如下： rw$ =!iyO  
function [G5]=fun(x); 2M>`W5  
syms n1 n2 k1 k2 d; 0<XxR6w  
[subwave,nsub]=textread('subout.txt','%f %f'); <^w4+5sT/  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); FfC\uuRe  
[p,q]=size(subwave); Eb7GiRT#  
for j=1:p; M+VAol}1  
    wavel(j)=subwave(j,1); 1{<r~  
    n(j)=n1+n2/((wavel(j))^2); FN<Sagj  
    k(j)=k1*exp(k2/wavel(j)); V/+D]  
    N(j)=n(j)-i*k(j);  K,o&gY  
    phase(j)=2*pi*N(j)*d/wavel(j); Fr_6pEH]}  
    ns(j)=nsub(j,1); Hva/C{Y  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); "?G?G'yK>  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); P#|}]oG%  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j)));
)&$mFwf  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; tH(g;flO)  
    t1(j)=ts(j)*T(j); pupt__NZ)n  
    tf(j)=filmtran(j,1)/100; 4iv&!hAc;  
    difference(j)=(t1(j)-tf(j))^2; hvc3n> Y[}  
end KRM:h`+-.-  
G=symsum(difference(j),1,401); wzF%R{;  
G1=subs(G,n1,sym('x(1)')); 6@x^,SA  
G2=subs(G1,n2,sym('x(2)')); R:`)*=rL%  
G3=subs(G2,k1,sym('x(3)')); } 4ZWAzH  
G4=subs(G3,k2,sym('x(4)')); z~th{4#E;  
G5=subs(G4,d,sym('x(5)')); `|<? sjY  
1pz-jo,2'  
& h\!#X0  
2Z-QVwa*U  
在matlab下运行 X4
JSI%E  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); iB}*<~`.Eg  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); }"&Ye  
T930tX6"h  
Dqc2;>  
结果出错如下： 9/=+2SZ  
WIN3*z7oW  
??? Conversion to double from sym is not possible. A*{CT>  
Error in ==> fminsearch at 175 2;x+#D8  
fv(:,1) = funfcn(x,varargin{:}); Nj.;mr<  
w8bvqTQ  
哪位高手给看看 *#1
J  

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。 y@r0"cvz9  
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万分感谢呀