[求助]fminsearch应用出错 [复制链接]

我的M文件如下： ?W&a
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function [G5]=fun(x); nYK!'x$  
syms n1 n2 k1 k2 d; ASNo6dP7  
[subwave,nsub]=textread('subout.txt','%f %f'); A}1:fw\Fn3  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); s1T}hp  
[p,q]=size(subwave); FWS!b!#,N  
for j=1:p; Xd&oERJj  
    wavel(j)=subwave(j,1); >lugHF$G  
    n(j)=n1+n2/((wavel(j))^2);
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    k(j)=k1*exp(k2/wavel(j)); D6EqJ,~  
    N(j)=n(j)-i*k(j); b/=>'2f  
    phase(j)=2*pi*N(j)*d/wavel(j); `1R[J4e  
    ns(j)=nsub(j,1); ,w_C~XN$t  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); a$Ghb]  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); ay28%[Q b4  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); 2{L[D9c/6  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; k:1|Z+CJ  
    t1(j)=ts(j)*T(j); dp:5iuS  
    tf(j)=filmtran(j,1)/100; X-%91z:o58  
    difference(j)=(t1(j)-tf(j))^2; o^BX:\}  
end PC)V".W1  
G=symsum(difference(j),1,401); 3d_g@x#
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G1=subs(G,n1,sym('x(1)')); ab<7jfFIa  
G2=subs(G1,n2,sym('x(2)')); lq27^K  
G3=subs(G2,k1,sym('x(3)')); @Lm(bW  
G4=subs(G3,k2,sym('x(4)')); ?/KkN3Y_j[  
G5=subs(G4,d,sym('x(5)')); JZD&u6tB   
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在matlab下运行 ]tEH`Kl  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); e?dR'*-z  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); )/t=g  
M,P:<-J  
[xPO'@Y  
结果出错如下： ATI2  
<P c;8[  
??? Conversion to double from sym is not possible. rf$eg  
Error in ==> fminsearch at 175 vLM-v  
fv(:,1) = funfcn(x,varargin{:}); X!]p8Q y  
QWK\6  
哪位高手给看看 Vj_z"t7q  

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。 1;[ZkRbzL  
J<7nOB}OD  
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万分感谢呀