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I want to change a 2d array a = [[1,2,3] [3,4,5] [6,7,8] [9,10,11]] into

b= [[9,10,11]
[6,7,8]
[3,4,5]
[1,2,3]]

using numpy package

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  • 1
    .. numpy.flipud? Commented Jul 23, 2019 at 15:23
  • 1
    or a[::-1, :]? Commented Jul 23, 2019 at 15:25
  • Also, those are python lists, not numpy arrays... Commented Jul 23, 2019 at 15:25

1 Answer 1

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1

This looks like task for numpy.flip, that is:

import numpy as np
a = np.array([[1,2,3],[3,4,5],[6,7,8],[9,10,11]])
b = np.flip(a,0)
print(b)

Output:

[[ 9 10 11]
 [ 6  7  8]
 [ 3  4  5]
 [ 1  2  3]]
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