[求助]fminsearch应用出错 [复制链接]

我的M文件如下： k 5~#_D>  
function [G5]=fun(x); c)L1@qdZ  
syms n1 n2 k1 k2 d; 2kG(\+\  
[subwave,nsub]=textread('subout.txt','%f %f'); fLGZ@-qA0  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); cD&QN9  
[p,q]=size(subwave); |->P|1 P  
for j=1:p; PIo8mf/  
    wavel(j)=subwave(j,1); k4@$vxy0  
    n(j)=n1+n2/((wavel(j))^2); ;_bZH%o.  
    k(j)=k1*exp(k2/wavel(j)); H]zi>;D  
    N(j)=n(j)-i*k(j); )\xDo<@  
    phase(j)=2*pi*N(j)*d/wavel(j); 1u9*)w  
    ns(j)=nsub(j,1); VaV(+X  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); -MA/:EB  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); ]H%SGQPn  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); Ll2yJ .C4  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; 2b&&3u8  
    t1(j)=ts(j)*T(j); 3izGMH_`  
    tf(j)=filmtran(j,1)/100; qwf97pg$  
    difference(j)=(t1(j)-tf(j))^2; ON.1'Wk?  
end ca@?-)  
G=symsum(difference(j),1,401); 7dg2-4  
G1=subs(G,n1,sym('x(1)')); "W"
2Y(  
G2=subs(G1,n2,sym('x(2)')); h vC gd^M  
G3=subs(G2,k1,sym('x(3)')); {Yt@H

 
G4=subs(G3,k2,sym('x(4)')); 6jDHA3  
G5=subs(G4,d,sym('x(5)')); ?.*^#>
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在matlab下运行 o+}>E31a  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); sYMgi D  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); @N(*1,s2  
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结果出错如下： ],?$&  
_NwB7@ e  
??? Conversion to double from sym is not possible. 9/yE\p.  
Error in ==> fminsearch at 175 yJ0q)x sS  
fv(:,1) = funfcn(x,varargin{:}); ^8z~`he=_J  
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哪位高手给看看 y;$ !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。 C1M @;  
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万分感谢呀