[SciPy-user] Again on Sorting Objects

Johann Cohen-Tanugi cohen@slac.stanford....
Mon Jan 21 14:12:35 CST 2008


great little tools. I realized following this thread that it would be 
extremely handy for me to have a fast easy way to do this groupby but on 
2D arrays. In other words, starting with
array([[  1,  12],
       [  1,  24],
       [  2,   3],
       [  2,  60],
       [  2, 100],
       [  3,  75]])

I would love to end with :
array([[  1,  12],
       [  1,  24]])

array([[  2,   3],
       [  2,  60],
       [  2, 100]])

array([[  3,  75]])

or sthg like that. Anyway to do that quickly, based on the previous 
mentioned tools?

best,
Johann

Alan G Isaac wrote:
> So ``a`` is already sorted?
> Use groupby?
>
> Cheers,
> Alan Isaac
>
>   
>>>> from itertools import groupby
>>>> for t,v in groupby(a): print list(v)
>>>>         
> ...
> [2]
> [3]
> [4, 4, 4, 4]
> [5]
> [6, 6]
> [8, 8, 8]
> [10, 10]
>
>
>
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> SciPy-user@scipy.org
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>   


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