If you just want i to be unordered, use numpy.argsort on j. S.M.
> I have a large number (> 1bn) of (32-bit) integer co-ordinates (i, j) in a > file. The i are ordered and the j unordered eg. > ... > 6940, 22886 > 6940, 38277 > 6940, 43788 > 7007, 0 > 7007, 2362 > 7007, 34 > etc. > ... > > I want to create (j, i) with j ordered and i unordered and store in a file > ie. > ... > 38277, 567 > 38277, 90023 > 38277, 6940 > 43788, 5672 > 43788, 98 > etc > ... > > My computers have sufficient memory (2gb on one and 8gb on another). > > Any ideas how I could do this using numpy? > > Dinesh > _______________________________________________ > Numpy-discussion mailing list > Numpy-discussion@scipy.org > http://mail.scipy.org/mailman/listinfo/numpy-discussion > _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
