我的M文件如下: *wW/nr=\;  
function [G5]=fun(x); {e,m<mAi  
syms n1 n2 k1 k2 d; 5TlPs_o  
[subwave,nsub]=textread('subout.txt','%f %f'); ZoJ:4uo
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[filmwave,filmtran]=textread('filmtr.dat','%f %f'); o[AQS`  
[p,q]=size(subwave); A8JEig	3Ix  
for j=1:p; &&e{ 9{R  
    wavel(j)=subwave(j,1); 
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    n(j)=n1+n2/((wavel(j))^2); ;^)(q<]  
    k(j)=k1*exp(k2/wavel(j)); 7)zn[4v7qt  
    N(j)=n(j)-i*k(j); /ZAS%_as  
    phase(j)=2*pi*N(j)*d/wavel(j); l 6wX18~XJ  
    ns(j)=nsub(j,1); 	Ba/Z<1)  
    B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); 	zn5  
    C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); 0dhJ# [Y  
    T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); 5q[0;`J  
    ts(j)=1-((1-ns(j))/(1+ns(j)))^2; zR)|%[sWwQ  
    t1(j)=ts(j)*T(j); 9WQC\/w  
    tf(j)=filmtran(j,1)/100; 6,'v
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    difference(j)=(t1(j)-tf(j))^2; 8ID
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end  \nV|Y=5  
G=symsum(difference(j),1,401); Ww*='lz  
G1=subs(G,n1,sym('x(1)')); mLM$dk3  
G2=subs(G1,n2,sym('x(2)')); L{$ZL &  
G3=subs(G2,k1,sym('x(3)')); ^.Y"<oZSS  
G4=subs(G3,k2,sym('x(4)')); Qg+0(odd  
G5=subs(G4,d,sym('x(5)')); {N+N4*   
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在matlab下运行 }9fH`C/m  
>> options=optimset('tolfun',1e-8,'tolx',1e-8); 	}fw;{&s{z  
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); nf!RB-orF  
 <Gzy*1Q&  
 qPdNI1	|  
结果出错如下: 0 1[LPN  
 'j=7'aX>K  
??? Conversion to double from sym is not possible. ~~]/<d  
Error in ==> fminsearch at 175 07-S%L7Z  
fv(:,1) = funfcn(x,varargin{:}); ;J pdnV  
 bL5z%bV  
哪位高手给看看 cOra`7L`