Hi,
On Tue, Jan 15, 2013 at 1:50 PM, Mads Ipsen <madsip...@gmail.com> wrote:
> Hi,
>
> I simply can't understand this. I'm trying to use argsort to produce
> indices that can be used to sort an array:
>
> from numpy import *
>
> indices = array([[4,3],[1,12],[23,7],[11,6],[8,9]])
> args = argsort(indices, axis=0)
> print indices[args]
>
> gives:
>
> [[[ 1 12]
> [ 4 3]]
>
> [[ 4 3]
> [11 6]]
>
> [[ 8 9]
> [23 7]]
>
> [[11 6]
> [ 8 9]]
>
> [[23 7]
> [ 1 12]]]
>
> I thought this should produce a sorted version of the indices array.
>
> Any help is appreciated.
>
Perhaps these three different point of views will help you a little bit
more to move on:
In []: x
Out[]:
array([[ 4, 3],
[ 1, 12],
[23, 7],
[11, 6],
[ 8, 9]])
In []: ind= x.argsort(axis= 0)
In []: ind
Out[]:
array([[1, 0],
[0, 3],
[4, 2],
[3, 4],
[2, 1]])
In []: x[ind[:, 0]]
Out[]:
array([[ 1, 12],
[ 4, 3],
[ 8, 9],
[11, 6],
[23, 7]])
In []: x[ind[:, 1]]
Out[]:
array([[ 4, 3],
[11, 6],
[23, 7],
[ 8, 9],
[ 1, 12]])
In []: x[ind, [0, 1]]
Out[]:
array([[ 1, 3],
[ 4, 6],
[ 8, 7],
[11, 9],
[23, 12]])
-eat
>
> Best regards,
>
> Mads
>
> --
> +-----------------------------------------------------+
> | Mads Ipsen |
> +----------------------+------------------------------+
> | Gåsebæksvej 7, 4. tv | |
> | DK-2500 Valby | phone: +45-29716388 |
> | Denmark | email: mads.ip...@gmail.com |
> +----------------------+------------------------------+
>
>
>
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