f1 = figure();
pause (0.1);
pos1 = get(f1,"position")
pos1(1) = pos1(1) + 50;
pos1(2) = pos1(2) - 50;
pos1(3) = pos1(4) * 2
set(f1,"position",pos1) #before drawn
drawnow
pos1_after = get(f1,"position")
if (! isequal (pos1, pos1_after))
  warning ("position1 after drawnow is different");
endif
