%
%?Liscense?Notification?2013
%
%?Redistributions?in?source?and?binary?forms?with?or?without
%?modification?are?totally?FREE?provided?that?you?keep?this?keep?this
%?notification
%
%??Descritption:?This?package?demonstrates?the?discrete?adaboost?with
%??stump（decision?tree?with?only?the?root?node）?weak?classifers.
%??Author:??Ranch?Lai?（ranchlai@hotmail.com）
%??Release?date:?Aug?17?2013
%/
%%
clc;
clear;
close?all;


%%?generate?random?data
shift?=3.0;
n?=?2;%2?dim
%y?=?1./exp（-w‘*x+b）
sigma?=?1;
N?=?500;
x?=?[randn（nN/2）-shift?randn（nN/2）*sigma+shift];
y?=?[ones（N/21）;-ones（N/21）];

%show?the?data
figure;
plot（x（11:N/2）x（21:N/2）‘rs‘）;
hold?on;
plot（x（11+N/2:N）x（21+N/2:N）‘go‘）;
title（‘2d?training?data‘）;
legend（‘Positve?samples‘‘Negative?samples‘‘Location‘‘SouthEast‘）;

%?model?fitting?using?maximum?likelihood
[model_posmodel_neg]?=?FindGuassianModel（xy）;

%%?test?on?new?dataset?same?distribution

n?=?2;%2?dim
%y?=?1./exp（-w‘*x+b）
sigma?=?2;
N?=?500;
x?=?[randn（nN/2）-shift?randn（nN/2）*sigma+shift];
y?=?[ones（N/21）;-ones（N/21）];

figure;
plot（x（11:N/2）x（21:N/2）‘rs‘）;
hold?on;
plot（x（11+N/2:N）x（21+N/2:N）‘go‘）;
title（‘2d?testing?data‘）;
hold?on;

%%?gaussian?model?as?a?baseline
[errh]?=?FindModelError（model_posmodel_negxy）;
fprintf（‘Baysian?error?on?test?data?set:?%f\n‘err/N）;
x_pos?=?x（:h==1）;
x_neg?=?x（:h~=1）;
plot（x_pos（1:）x_pos（2:）‘r.‘）;
hold?on;
plot（x_neg（1:）x_neg（2:）‘g.‘）;
legend（‘Positve?samples‘‘Negative?samples‘‘Positve?samples?as?predicted‘‘Negative?samples?as?predicted‘‘Location‘‘SouthEast‘）;

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2013-08-27?03:07??Baysian+Gaussian\
?????文件????????8669??2013-08-27?03:07??Baysian+Gaussian\training.png
?????文件???????11809??2013-08-27?03:07??Baysian+Gaussian\predict.png
?????文件????????1583??2013-08-27?03:04??Baysian+Gaussian\demo_adaboost.m
?????文件?????????615??2013-08-26?09:43??Baysian+Gaussian\FindModelError.m
?????文件?????????401??2013-08-26?10:01??Baysian+Gaussian\FindGuassianModel.m