function Bool = recta(x,y)
  % rectangle [-0.6,-0.4]x[-0.9,-0.2]
  %Bool = ~(-0.6 <= x & x <= -0.4 & -0.9 <= y & y <= -0.2);
  Bool = ~(-0.6 <= x & x <= -0.4 & -0.9 <= y & y <= 1);