numpy last index code example

Example 1: how to get last element in numpy array

In [10]: arr = numpy.array([1,23,4,6,7,8])

In [11]: [(arr[i], arr[-i-1]) for i in range(len(arr) // 2)]
Out[11]: [(1, 8), (23, 7), (4, 6)]

Example 2: indexing a numpy array in python

array = [[0  1  2  3  4  5] 
  [6 7 8 9 10 11]
  [12 13 14 15 16 17]
  [18 19 20 21 22 23]
  [24 25 26 27 28 29]
  [30 31 32 33 34 35]]
array[0, 3:5]  =  [3 4]

array[4:, 4:] = [[28 29],
             [34 35]]

array[:, 2] =  [2 8 14 20 26 32]

array[2:;2, ::2] = [[12 14 16],
                [24 26 28]]