Le mardi 18 octobre 2011 13:44:00, Chao YUE a écrit :
> Dear all,
>
> if I have
>
> In [395]: a
> Out[395]:
> array([[0, 1, 2, 3, 4],
> [5, 6, 7, 8, 9]])
>
> In [396]: a[...,-1]
> Out[396]: array([4, 9])
>
> In [397]: a[...,-4:-1]
> Out[397]:
> array([[1, 2, 3],
> [6, 7, 8]])
>
> In [398]: a[...,-4:0]
> Out[398]: array([], shape=(2, 0), dtype=int64)
>
> how can I pick up something like:
> array([[1, 2, 3, 4],
> [6, 7, 8, 9]])
>
> I want to index the final 4 rows. I cannot figure out how to do this?
>
Don't you want to do :
In [1]: a[:,-4:]
Out[1]:
array([[1, 2, 3, 4],
[6, 7, 8, 9]])
Éric.
> Thanks for any help,
>
> Chao
Un clavier azerty en vaut deux
----------------------------------------------------------
Éric Depagne e...@depagne.org
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