Tartifola wrote:
>
> Hi,
> I'm working with numerical array and I'm a little lost on a particular
> sorting of one of them. In particular I have an array like
>
> a = array([[8,4,1],[2,0,9]])
>
> and I need to sort it using only the first column as reference but
> keeping the lines together so to obtain
>
> array([[2, 0, 9],
> [8, 4, 1]])
In [1]: from numpy import *
In [2]: a = array([[8,4,1],[2,0,9]])
In [3]: i = argsort(a[:,0])
In [4]: a[i]
Out[4]:
array([[2, 0, 9],
[8, 4, 1]])
numpy questions are best asked on the numpy-discussion mailing list since
everyone there automatically knows that you are talking about numpy arrays and
not just misnaming lists. ;-)
http://www.scipy.org/Mailing_Lists
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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