[Numpy-discussion] Sorting large numbers of co-ordinate pairs

Sturla Molden sturla@molden...
Fri Mar 13 05:57:40 CDT 2009


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
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