I am not certain what result you want.
Try this:
A = randi([2 3], 1, 30); % Create ‘A’
B = randi([2 3], 1, 30); % Create ‘B’
T = 1:numel(A); % Create Time Reference
HF = @(a,b) (a > b); % Function
figure(1)
plot(T, A, T, B)
hold on
plot(T, HF(A,B), 'LineWidth',2)
hold off
ylim = [-0.1 3.1];
legend('A', 'B', 'HF(A,B)', 'Location','E')
