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 w
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
38
