2 hours with no answer. Yeah, I guess you need to attach the text files before anyone tries to deal with this problem. We don't know what arrays you have, like arrays for lat, long, time, value, etc. So all I can suggest at this point is to use the sort() function. In the meantime try something like
latLon = [lat(:), longitude(:)]; % Get all lats and lons in an N-by-2 array.
% There may be repeats, so extract only the unique locations.
uniqueLocations = unique(latLon, 'rows');
for row = 1 : size(uniqueLocations, 1)
thisLat = uniqueLocations(row, 1);
thisLon = uniqueLocations(row, 2);
% Find rows with that location
theseRows = lat == thisLat & longitude == thisLon;
% Extract times and values
theseTimes = time(theseRows);
theseValues = values(theseRows);
% Now do something with them.
end
