[求助]fminsearch应用出错 [复制链接]

我的M文件如下： Rl,B !SF  
function [G5]=fun(x); ?FA:K0H?zl  
syms n1 n2 k1 k2 d; X)yTx8v4  
[subwave,nsub]=textread('subout.txt','%f %f'); !{4p+peqJV  
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); HP7Ec  
[p,q]=size(subwave); lyib+Sa ?`  
for j=1:p; ZFRKh:|  
    wavel(j)=subwave(j,1); tHGK<rb  
    n(j)=n1+n2/((wavel(j))^2); 83S],L  
    k(j)=k1*exp(k2/wavel(j)); v9<p@GY"\  
    N(j)=n(j)-i*k(j); )Q
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    phase(j)=2*pi*N(j)*d/wavel(j); Ad"::&&Wk  
    ns(j)=nsub(j,1); `Q{kiy  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); Yux7kD\c  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); DF|qNX  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); )X@(>b{  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; BFMM6-Ve  
    t1(j)=ts(j)*T(j); -Wmpj  
    tf(j)=filmtran(j,1)/100; `xtN+y F  
    difference(j)=(t1(j)-tf(j))^2; Oe5aNo  
end r}vrE ^Q  
G=symsum(difference(j),1,401); lFB Ka ,6  
G1=subs(G,n1,sym('x(1)')); 0]"j,  
G2=subs(G1,n2,sym('x(2)')); akNJL\b  
G3=subs(G2,k1,sym('x(3)')); =^{^KHzIl3  
G4=subs(G3,k2,sym('x(4)')); E&97;VH  
G5=subs(G4,d,sym('x(5)')); m,*f6g  
vbSz&+52;  
6!bf,T
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=B;)h  
在matlab下运行 ~:JKXa?  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); QJv,@@mu  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); lRO4- y  
x.d9mjLN8m  
'dx4L }d  
结果出错如下： )d s(/P5b  

w("jyvV[C  
??? Conversion to double from sym is not possible. (V |P6C  
Error in ==> fminsearch at 175 oVLz7Y[JE  
fv(:,1) = funfcn(x,varargin{:}); MY0Wr%@#0  
(Q\w4?ci  
哪位高手给看看 eqLETo@} *  

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。 Qi[T!1  
U:`rNHl  
AjZT- Q0L  
万分感谢呀