我的M文件如下: !Uhc jfq`e
function [G5]=fun(x); V@1,((,l
syms n1 n2 k1 k2 d; ^6!8)7b
[subwave,nsub]=textread('subout.txt','%f %f'); azTiY@/
[filmwave,filmtran]=textread('filmtr.dat','%f %f'); 5xH*&GpL7
[p,q]=size(subwave); GB6(WAmr
for j=1:p; |Y2n6gkH[
wavel(j)=subwave(j,1); s:tWEgZk?
n(j)=n1+n2/((wavel(j))^2); Z_T~2t
k(j)=k1*exp(k2/wavel(j)); u (`7F(R
N(j)=n(j)-i*k(j); eYv+tjIF
phase(j)=2*pi*N(j)*d/wavel(j); %r:4'$E7|
ns(j)=nsub(j,1); =[gFaB_H
B(j)=cos(phase(j))+ns(j)*i*sin(phase(j))/N(j); dcE(uf
C(j)=i*N(j)*sin(phase(j))+ns(j)*cos(phase(j)); +]Z*_?j9{
T(j)=4*ns(j)/((B(j)+C(j))*conj(B(j)+C(j))); eN m
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ts(j)=1-((1-ns(j))/(1+ns(j)))^2; gM6o~ E
t1(j)=ts(j)*T(j); FGpV
]p
tf(j)=filmtran(j,1)/100; BbzIQg:
difference(j)=(t1(j)-tf(j))^2; l@@qpaH
end j?!/#'
G=symsum(difference(j),1,401); a]I~.$G
G1=subs(G,n1,sym('x(1)')); f>? b2a2HX
G2=subs(G1,n2,sym('x(2)')); ;y>}LGG
G3=subs(G2,k1,sym('x(3)')); :1#$p
G4=subs(G3,k2,sym('x(4)')); fs#9*<]m
G5=subs(G4,d,sym('x(5)')); J^pq<
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在matlab下运行 VB4ir\nF
>> options=optimset('tolfun',1e-8,'tolx',1e-8); ZYz8ul$E
>> [xmin,value,flag,output]=fminsearch(@fun,[1.7,4000,0.005,400,500],options); os+]ct
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结果出错如下: 9}d^ll&
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??? Conversion to double from sym is not possible. X>MDX.Z
Error in ==> fminsearch at 175 (%{!TJg ZR
fv(:,1) = funfcn(x,varargin{:}); O+~@S~
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哪位高手给看看 jZqCM{