[求助]fminsearch应用出错 [复制链接]

我的M文件如下： 7*>(C*q=  
function [G5]=fun(x); @AfC$T  
syms n1 n2 k1 k2 d; qBDhCE  
[subwave,nsub]=textread('subout.txt','%f %f'); Qj3l>O
 
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); :p
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[p,q]=size(subwave); q/eod  
for j=1:p; MZWicfUy  
    wavel(j)=subwave(j,1);  %G>  
    n(j)=n1+n2/((wavel(j))^2); 2qDyb]9  
    k(j)=k1*exp(k2/wavel(j)); +Ua.\1"6  
    N(j)=n(j)-i*k(j); q]rqFP0C  
    phase(j)=2*pi*N(j)*d/wavel(j); Y+Cqc.JBQ  
    ns(j)=nsub(j,1); /VHQ!Wi  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); s$ZKd  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); ;y]BXW&l&  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); #-7m@EU;O  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; J/>9
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    t1(j)=ts(j)*T(j); 5J2tR6u-(  
    tf(j)=filmtran(j,1)/100; !V27ln KP+  
    difference(j)=(t1(j)-tf(j))^2; |_u|Td(n  
end :Oh*Q(>  
G=symsum(difference(j),1,401); #v\o@ArX  
G1=subs(G,n1,sym('x(1)')); A|<i7QVY  
G2=subs(G1,n2,sym('x(2)')); Fx3X  
G3=subs(G2,k1,sym('x(3)')); ?656P=b)  
G4=subs(G3,k2,sym('x(4)')); bZCNW$C3l  
G5=subs(G4,d,sym('x(5)')); Z_(P^/  
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~vV+)KI  
在matlab下运行 xz*MFoE  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); 8c<OX!  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); q vGP$g  
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结果出错如下： %ou
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??? Conversion to double from sym is not possible. get$r5  
Error in ==> fminsearch at 175 O`TM}  
fv(:,1) = funfcn(x,varargin{:}); ={B?hjo<-
 
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哪位高手给看看 k~=W1R%  

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。 3}nkTZG  
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万分感谢呀