[Numpy-discussion] index the last several members of a ndarray

Chao YUE chaoyuejoy@gmail....
Tue Oct 18 06:44:00 CDT 2011


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?

Thanks for any help,

Chao
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Chao YUE
Laboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL)
UMR 1572 CEA-CNRS-UVSQ
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