%??Descritption:?This?package?demostrates?how?to?use?the?logistic
%??regression?for?classfication?of?2D?data.

clc;
clear;
close?all;

%%
x?=?-10:0.1:10;
y?=?1./（exp（-x）+1）;
plot（xy‘g-x‘）;
title（‘logistic?function‘）;
xlabel（‘x‘）;ylabel（‘y‘）;
%%?generate?random?data生產隨機數據
shift?=?2;
n?=?2;%2?dim?按列
%y?=?1./exp（-w‘*x+b）
N?=?200;
x?=?[randn（nN/2）-shift?randn（nN/2）*2+shift];
y?=?[zeros（N/21）;ones（N/21）];

%show?the?data?顯示數據
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‘）;



%%
%training..?訓練
[wbcost]?=?logistic_train（xy1e-6100）;
%%
disp（‘training?ended‘）;
figure;
plot（cost‘g-s‘）;
xlabel（‘iterate‘）;%迭代
ylabel（‘cost‘）;
set（gca‘YScale‘‘log‘）;
title（‘convergence?curve‘）;%收斂曲線


%%?plot?the?training?data
figure;
p

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件????????1207??2014-08-19?17:09??2d?logistic?regression\2d?logistic?regression?demo\demo_logistic.asv
?????文件????????1251??2014-08-19?17:11??2d?logistic?regression\2d?logistic?regression?demo\demo_logistic.m
?????文件?????????340??2014-08-19?18:34??2d?logistic?regression\2d?logistic?regression?demo\logistic_cost.asv
?????文件?????????340??2014-08-19?18:39??2d?logistic?regression\2d?logistic?regression?demo\logistic_cost.m
?????文件?????????324??2014-08-19?18:44??2d?logistic?regression\2d?logistic?regression?demo\logistic_predict.asv
?????文件?????????504??2013-08-17?14:05??2d?logistic?regression\2d?logistic?regression?demo\logistic_predict.m
?????文件????????1440??2014-08-19?17:14??2d?logistic?regression\2d?logistic?regression?demo\logistic_train.asv
?????文件????????1470??2014-08-19?17:17??2d?logistic?regression\2d?logistic?regression?demo\logistic_train.m
?????文件???????13912??2013-08-17?12:27??2d?logistic?regression\2d?logistic?regression?demo\figure\classification.png
?????文件????????4540??2013-08-17?12:27??2d?logistic?regression\2d?logistic?regression?demo\figure\convergence.png
?????文件????????4953??2013-08-17?12:29??2d?logistic?regression\2d?logistic?regression?demo\figure\logisticfunction.png
?????文件????????6897??2013-08-17?12:28??2d?logistic?regression\2d?logistic?regression?demo\figure\trainingdata.png