[求助]fminsearch应用出错 [复制链接]

我的M文件如下： !,D7L6N  
function [G5]=fun(x); O&DkB*-  
syms n1 n2 k1 k2 d; WiDl[l"{9  
[subwave,nsub]=textread('subout.txt','%f %f'); C\%T|ZDE  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); [bE-Uu7q5P  
[p,q]=size(subwave); |.w'Z7(s  
for j=1:p; h"~i&T h  
    wavel(j)=subwave(j,1); MW^(  
    n(j)=n1+n2/((wavel(j))^2); :bBLP7eyV  
    k(j)=k1*exp(k2/wavel(j)); 9W^sq<tR  
    N(j)=n(j)-i*k(j); Q]44A+
M]  
    phase(j)=2*pi*N(j)*d/wavel(j); QaAA@l  
    ns(j)=nsub(j,1); jb0wP01R  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); w;;yw3  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); ^HS;\8Xvb  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); 12{F  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; 91I6-7# Xt  
    t1(j)=ts(j)*T(j); 36]pE<  
    tf(j)=filmtran(j,1)/100; !VLk|6mn  
    difference(j)=(t1(j)-tf(j))^2; F4M )x`  
end \"]KF8c^_  
G=symsum(difference(j),1,401); ;v#BguM  
G1=subs(G,n1,sym('x(1)')); Y.}"<{RQ  
G2=subs(G1,n2,sym('x(2)')); &%@e6..Ex  
G3=subs(G2,k1,sym('x(3)')); ++9?LH4S4  
G4=subs(G3,k2,sym('x(4)')); W=E+/ZvPt  
G5=subs(G4,d,sym('x(5)')); Q#kSp8  
Iax-~{B3AY  
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在matlab下运行 =g.R?H8cj5  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); KU]co4]8^s  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); !sknO53`H`  
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n>t&l8g%g  
结果出错如下：  3o_)x  

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??? Conversion to double from sym is not possible. V/.Na(C~  
Error in ==> fminsearch at 175 CdEQiu  
fv(:,1) = funfcn(x,varargin{:}); G3.*fSY$.<  
lw\+!}8(  
哪位高手给看看 wDQ@$T^vh  

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。 ^l:~r2  
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万分感谢呀