clear all;
close all;

x=[2 3 1 2 2.5];
y=[2 3 6 6.5 9.5];
L=[1 1 -1 -1 -1];

rand(seed,131);
for ii=1:4
  ind{ii}=floor(5*rand(5,1))+1;
end

for ii=1:4
  xx{ii}=x(ind{ii});
  yy{ii}=y(ind{ii});
  ll{ii}=L(ind{ii});
end

for ii=1:4
  idx1{ii}=find(ll{ii}==1);
  idx2{ii}=find(ll{ii}==-1);
end

for ii=1:4
  figure;plot(xx{ii}(idx1{ii}),yy{ii}(idx1{ii}),.);axis([0 4 012]);grid on;
  hold on;text(xx{ii}(idx1{ii})+0.05,yy{ii}(idx1{ii})+0.2,+1);
  plot(xx{ii}(idx2{ii}),yy{ii}(idx2{ii}),.);axis([0 4 0 12]);grid on;
  hold on;text(xx{ii}(idx2{ii})+0.05,yy{ii}(idx2{ii})+0.2,-1);
end