In [1]:

    

import numpy as np


    

In [2]:

    

a = np.arange(10)
print(a)


    

    




[0 1 2 3 4 5 6 7 8 9]

In [3]:

    

a_roll = np.roll(a, 3)
print(a_roll)


    

    




[7 8 9 0 1 2 3 4 5 6]

In [4]:

    

print(a)


    

    




[0 1 2 3 4 5 6 7 8 9]

In [5]:

    

a_roll[0] = 100
print(a_roll)


    

    




[100   8   9   0   1   2   3   4   5   6]

In [6]:

    

print(a)


    

    




[0 1 2 3 4 5 6 7 8 9]

In [7]:

    

print(np.roll(a, -3))


    

    




[3 4 5 6 7 8 9 0 1 2]

In [8]:

    

print(np.roll(a, 12))


    

    




[8 9 0 1 2 3 4 5 6 7]

In [9]:

    

# print(np.roll(a, 0.5))
# TypeError: slice indices must be integers or None or have an __index__ method


    

In [10]:

    

a_2d = np.arange(12).reshape(3, 4)
print(a_2d)


    

    




[[ 0  1  2  3]
 [ 4  5  6  7]
 [ 8  9 10 11]]

In [11]:

    

print(np.roll(a_2d, 2))


    

    




[[10 11  0  1]
 [ 2  3  4  5]
 [ 6  7  8  9]]

In [12]:

    

print(np.roll(a_2d, 5))


    

    




[[ 7  8  9 10]
 [11  0  1  2]
 [ 3  4  5  6]]

In [13]:

    

print(np.roll(a_2d, 1, axis=0))


    

    




[[ 8  9 10 11]
 [ 0  1  2  3]
 [ 4  5  6  7]]

In [14]:

    

print(np.roll(a_2d, 2, axis=1))


    

    




[[ 2  3  0  1]
 [ 6  7  4  5]
 [10 11  8  9]]

In [15]:

    

print(np.roll(a_2d, (1, 2), axis=(0, 1)))


    

    




[[10 11  8  9]
 [ 2  3  0  1]
 [ 6  7  4  5]]

In [16]:

    

a_3d = np.arange(24).reshape(2, 3, 4)
print(a_3d)


    

    




[[[ 0  1  2  3]
  [ 4  5  6  7]
  [ 8  9 10 11]]

 [[12 13 14 15]
  [16 17 18 19]
  [20 21 22 23]]]

In [17]:

    

print(np.roll(a_3d, 3))


    

    




[[[21 22 23  0]
  [ 1  2  3  4]
  [ 5  6  7  8]]

 [[ 9 10 11 12]
  [13 14 15 16]
  [17 18 19 20]]]

In [18]:

    

print(np.roll(a_3d, 2, axis=2))


    

    




[[[ 2  3  0  1]
  [ 6  7  4  5]
  [10 11  8  9]]

 [[14 15 12 13]
  [18 19 16 17]
  [22 23 20 21]]]