plotdecisionsurf.m

patten regnization source从1-14章能运行

% 楷搬 啊吝 氦磐俊 荐流牢 3D 乞搁阑 敲吩茄促.

%捞 乞搁惑俊 乐绰 痢篮 涝仿苞狼 啊吝钦捞 康捞 登骨肺 
%免仿 蜡粗阑 劝己拳 矫虐绊 厚劝己拳 矫虐绰 版拌俊 困摹窍绊 乐绰 巴捞促.  
%捞 乞搁狼 困俊 乐绰 痢甸篮 剧狼 net 涝仿捞 登绢 免仿阑 劝己拳 矫虐哥, 
%馆措肺 乞搁 关俊 乐绰 痢甸篮 蜡粗阑 厚劝己拳 矫虐霸 等促.   

% weights(1)*X1 + weights(2)*X2 + weights(3)*X3 + weights(4) = 0 栏肺 沥狼等
% 康开阑 父练窍绰 (X1,X2,X3) 蔼狼 拜磊 弊府靛(grid)甫 积己茄促 

% 霉掳 滴绵俊 措茄 谅钎 氦磐甫 积己
x1=0:0.1:1;
x2=x1;

% 敲吩窍扁 困秦 谅钎 青纺肺 函券
[X1,X2]=meshgrid(x1,x2);
% X1,X2肺 林绢柳 谅钎俊辑 搬沥 版拌 乞搁 青纺阑 积己 
SURFACE=-1/weights(3)*(weights(4)*ones(size(X1))+weights(1)*X1+weights(2)*X2);
mesh(X1,X2,SURFACE); 

% W1 X1 + W2 X2 + W3 X3 + W4 = 1 规氢 急阑 蝶扼  滴痢(X1 = 0.5, X2 = 0.5)
% 阑 啊肺瘤福绰 氦磐肺 啊吝摹甫 敲吩茄促.
x1 = 0.5;
x2 = 0.5;
x3 = -1/weights(3)*(weights(4) + weights(1) * x1 + weights(2) * x2);
x3a = x3 + 1;
x3b = x3 - 1;
plot3([x1 x1],[x2 x2],[x3a x3b]);