clear
syms?pw1?pw2;
pf=input（‘女生的先驗(yàn)概率：‘）;
pm=1-pf;
X=input（‘請(qǐng)輸入身高體重矩陣：‘）;
X=X‘

%求出為女生的概率密度函數(shù)
fid1=fopen（‘FEMALE.txt‘‘r‘）;
rf=textscan（fid1?‘%f?%f‘）;
fheight=mean（rf{1}）;
fweight=mean（rf{2}）;
fm=[fheight;fweight];
fM1=cov（rf{1}rf{2}）;
?fM=det（fM1）;
fw1=1/（（2*pi）*sqrt（fM））*exp（-0.5*（X-fm）‘*inv（fM1）*（X-fm））;
%求出為男生的概率密度函數(shù)
fid2=fopen（‘MALE.txt‘‘r‘）;
rm=textscan（fid2?‘%f?%f‘）;
mheight=mean（rm{1}）;
fweight=mean（rm{2}）;
X2=[fheight;fweight];
mN1=cov（rm{1}rm{2}）;
mN=det（（mN1））;
fw2=1/（（2*pi）*sqrt（mN））*exp（-0.5*（X-X2）‘*inv（mN1）*（X-X2））;
%求后驗(yàn)概率
hpf=pf*fw1/（pf*fw1+pm*fw2）;
hpm=pm*fw2/（pf*fw1+pm*fw2）;
?%設(shè)置風(fēng)險(xiǎn)矩陣
f=[0?7;3?0];
%計(jì)算風(fēng)險(xiǎn)及進(jìn)行判決
Rf=f（11）*hpf+f（12）*hpm
Rm=f（21）*hpf+f（22）*hpm
disp（‘身高和體重相關(guān)時(shí)，最小風(fēng)險(xiǎn)Bayes判決結(jié)果：‘）
if?Rf>=Rm
?????disp（‘It?is?a?male!‘）;
else
?????disp（‘It?is?a?female!‘）;
end

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件????????348??2010-03-29?10:48??test1.txt

?????文件???????3018??2010-03-29?11:58??test2.txt

?????文件???????1197??2010-03-29?12:40??test_sike.m

?????文件???????1171??2010-03-29?22:20??xunlian_sike.m

?????文件????????915??2010-03-28?22:26??bayes_sike.m

?????文件???????1005??2010-03-28?22:25??bayes_sike_notc.m

?????文件????????426??2004-10-08?09:03??FEMALE.TXT

?????文件????????424??2004-10-08?09:04??MALE.TXT

-----------?---------??----------?-----??----

?????????????????8504????????????????????8