function n = counts(spikes, w)
% Count spikes in time windows.
%
% Arguments:
%   spikes: a cell array of vectors of spike times in seconds
%   w: duration of window in seconds for computing the counts
%
% Returns:
%   n: vector with spike counts
    tmax = spikes{1}(end);
    n = [];
    for k = 1:length(spikes)
        times = spikes{k};
%       alternative 1: count the number of spikes in each window:
%         for tk = 0:w:tmax-w
%             nn = sum((times >= tk) & (times < tk+w));
%             % nn = length(find((times >= tk) & (times < tk+w)));
%             n = [n, nn];
%         end
%     alternative 2: use the hist() function to do that!
        tbins = 0.5*w:w:tmax-0.5*w;
        nn = hist(times, tbins);
        n = [n, nn];
    end
end