subplot counts across the first row first, i.e., subplot(6,4,2) is the subplot in the second column of the first row (not the first column of the second row). Therefore, I think you should swap the order of your for loops to get the subplots in the order you want. Then you can title the first four subplots (assuming you just want titles on the top ones).
figure
count = 1;
for fov = [0.2, 0.5, 1, 2, 5, 10]
for h = 1000:1000:4000
subplot(6, 4, count)
if count <= 4 % title subplots 1, 2, 3, 4
title(sprintf('CB %d(m)',h));
end
count = count + 1;
end
end
(To illustrate what happens with the order as you have it now:)
figure
count = 1;
for h = 1000:1000:4000
for fov = [0.2, 0.5, 1, 2, 5, 10]
subplot(6, 4, count)
if mod(count,6) == 1 % title plots 1, 7, 13, 19
title(sprintf('CB %d(m)',h));
end
count = count + 1;
end
end
