courseassignment3.m

线性分析,自己的作业,用于fisher的线性分类器

%courseassignment3
%2006级研 辛守庭
clear;
w1=[1,2,2,0,1;1,0,1,2,3;1,1,1,1,1];
w2=[-2,0,-1,-1,0;2,0,0,-1,-2;1,1,1,1,1];
z=zeros(3,10);
for k=1:5
    z(:,k)=w1(:,k);
    z(:,k+5)=-w2(:,k);
end
z
W0=[2;1;1];
m=1;
 while  m<11
     if W0.'*z(:,m)>0
        m=m+1;
     else
         W0=W0+z(:,m);
     end
 end
 for n=1:10
    if W0.'*z(:,n)<=0 
      warning('没有发现合适的W0');
      return;
     end 
 end
plot3(1,1,1,'ob',2,0,1,'ob',2,1,1,'ob',0,2,1,'ob',1,3,1,'ob');
hold all 
plot3(-2,2,1,'*r',0,0,1,'*r',-1,0,1,'*r',-1,-1,1,'*r',0,-2,1,'*r');
x=-3:0.1:2.5;
[x,y]=meshgrid(linspace(-3,2.5),linspace(-3,2.5));
z=(-W0(1)*x-W0(2)*y)/W0(3);
mesh(x,y,z);
view([40,32]);
grid on
box on
axis([-2.5,2.5,-2.5,4,0,4]);