inicial = load('inicial02.txt');
plot(inicial(:, 1), inicial(:, 2), 'r*');
hold on;
plot(inicial(:, 3), inicial(:, 4), 'bo'); 

figure(2);
salida = load('salida02.txt');
plot(salida(:, 1), salida(:, 2), 'r*');
hold on;
plot(salida(:, 3), salida(:, 4), 'bo'); 