4

Given this array:

>>> a
array([[ 0,  1,  2],
       [ 3,  4,  5],
       [ 6,  7,  8],
       [ 9, 10, 11]])

How can I select [[4,5], [7,8]]? a[0::2, 1:;2] doesn't work

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4
  • print a[1:3, 1:3] would work fine Commented May 27, 2016 at 4:49
  • what about select N elements from a given index? Commented May 27, 2016 at 4:52
  • It depends on the context of index, it a 1D array , 2D array or an ND array. Commented May 27, 2016 at 4:53
  • Same as the example above. Say select 2 elements from each dimension of an ND array given a N-tuple Commented May 27, 2016 at 4:54

1 Answer 1

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6 
>>> a
array([[ 0,  1,  2],
       [ 3,  4,  5],
       [ 6,  7,  8],
       [ 9, 10, 11]])
>>> a[1:3,1:3]
array([[4, 5],
       [7, 8]])

The first 1:3 is to select row 1 & 2. The second 1:3 is to select column 1 & 2.

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