Create legend in reverse order. Uses the same name-pair arguments as the default legend() function.
-Line plots
-Stacked bar graphs

Example 1:
x = 1:3;
y = [2 2 3; 2 5 6; 2 8 9; 2 11 12];
plot(x, y, 'LineWidth', 2)
legend_reverse('blue', 'red', 'orange', 'purple', 'Location', 'northwest');

Example 2:
y = [2 2 3; 2 5 6; 2 8 9; 2 11 12];
bar(y,'stacked');
legend_reverse('blue', 'red', 'orange', 'Location', 'northwest');