[求助]fminsearch应用出错 [复制链接]

我的M文件如下： W=|B3}C?  
function [G5]=fun(x); _2TIan}  
syms n1 n2 k1 k2 d; h)YqC$A-s  
[subwave,nsub]=textread('subout.txt','%f %f'); !g}9xIL  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); 0h; -Y
g  
[p,q]=size(subwave);
zX5
p'8-  
for j=1:p; 3wr~P  
    wavel(j)=subwave(j,1); W0?yPP=.  
    n(j)=n1+n2/((wavel(j))^2); C ]#R7G  
    k(j)=k1*exp(k2/wavel(j)); W9u(  
    N(j)=n(j)-i*k(j); ckTnb  
    phase(j)=2*pi*N(j)*d/wavel(j); *+J&ebSTN  
    ns(j)=nsub(j,1); G?[#<W@+  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); O|OPdD  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); N),Zb^~nw  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); r` 3)sc  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; ucMl>G'!gX  
    t1(j)=ts(j)*T(j); q
V(Plt%  
    tf(j)=filmtran(j,1)/100; mp5]=6~:m  
    difference(j)=(t1(j)-tf(j))^2; KcSvf;sx  
end ^i\zMMR
 
G=symsum(difference(j),1,401);
+ W +<~E  
G1=subs(G,n1,sym('x(1)')); ;z[yNW8  
G2=subs(G1,n2,sym('x(2)')); is`a_{5e=  
G3=subs(G2,k1,sym('x(3)')); K|s+5>]W/[  
G4=subs(G3,k2,sym('x(4)')); i=SX_#b^  
G5=subs(G4,d,sym('x(5)')); 21;n0E  
PCFm@S@Q  
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(57x5qP X  
在matlab下运行 BgE]xm  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); K&S~IFy  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); ~=c#Ff=Z  
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{)Gh~~57_W  
结果出错如下： |_ ;-~bmb  
)\s:.<?EQ  
??? Conversion to double from sym is not possible. ]{;K|rCR-  
Error in ==> fminsearch at 175 y[}BFUy  
fv(:,1) = funfcn(x,varargin{:}); {UwJg  
H{+U; 6b  
哪位高手给看看 mWigy`V^~  

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。 {9)LHX7dN  
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万分感谢呀