It would help to have the data.
Try something like this —
u = randn(1, 24001);
t = 1:numel(u);
r = 2000;
U = zeros(r,ceil(numel(u)/r));
U(1:numel(u)) = u; % 'U' Matrix
T = zeros(r,ceil(numel(t)/r));
T(1:numel(t)) = t; % 'T' Matrix
[max2000,idx] = max(U);
for k = 1:size(U,2)
t2000(k) = T(idx(k),k);
end
max2000
t2000
.
