P = [1 2; 2 2; 1 1]';
Tc = [1 2 3];
plot(P(1,:),P(2,:),'.','markersize',30)
for i=1:3, text(P(1,i)+0.1,P(2,i),sprintf('class %g',Tc(i))), end
axis([0 3 0 3])
title('Three vectors and their classes.')
xlabel('P(1,:)')
ylabel('P(2,:)')
pause