In [1]:

    

import numpy as np


    

In [2]:

    

a_2d = np.arange(6).reshape(2, 3)
print(a_2d)


    

    




[[0 1 2]
 [3 4 5]]

In [3]:

    

a_2d_rot = np.rot90(a_2d)
print(a_2d_rot)


    

    




[[2 5]
 [1 4]
 [0 3]]

In [4]:

    

print(np.shares_memory(a_2d, a_2d_rot))


    

    




True

In [5]:

    

a_2d_rot[0, 0] = 100
print(a_2d_rot)


    

    




[[100   5]
 [  1   4]
 [  0   3]]

In [6]:

    

print(a_2d)


    

    




[[  0   1 100]
 [  3   4   5]]

In [7]:

    

a_2d[0, 2] = 2
print(a_2d)


    

    




[[0 1 2]
 [3 4 5]]

In [8]:

    

print(a_2d_rot)


    

    




[[2 5]
 [1 4]
 [0 3]]

In [9]:

    

a_2d_rot_copy = np.rot90(a_2d).copy()
print(a_2d_rot_copy)


    

    




[[2 5]
 [1 4]
 [0 3]]

In [10]:

    

print(np.shares_memory(a_2d, a_2d_rot_copy))


    

    




False

In [11]:

    

print(np.rot90(a_2d, 2))


    

    




[[5 4 3]
 [2 1 0]]

In [12]:

    

print(np.rot90(a_2d, 3))


    

    




[[3 0]
 [4 1]
 [5 2]]

In [13]:

    

print(np.rot90(a_2d, 4))


    

    




[[0 1 2]
 [3 4 5]]

In [14]:

    

print(np.rot90(a_2d, 100))


    

    




[[0 1 2]
 [3 4 5]]

In [15]:

    

print(np.rot90(a_2d, -1))


    

    




[[3 0]
 [4 1]
 [5 2]]

In [16]:

    

print(np.rot90(a_2d, -2))


    

    




[[5 4 3]
 [2 1 0]]

In [17]:

    

a_1d = np.arange(3)
print(a_1d)


    

    




[0 1 2]

In [18]:

    

# print(np.rot90(a_1d))
# ValueError: Axes must be different.


    

In [19]:

    

a_2d_row = np.arange(3).reshape(1, 3)
print(a_2d_row)


    

    




[[0 1 2]]

In [20]:

    

print(np.rot90(a_2d_row))


    

    




[[2]
 [1]
 [0]]

In [21]:

    

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 [22]:

    

print(a_3d.shape)


    

    




(2, 3, 4)

In [23]:

    

print(np.rot90(a_3d))


    

    




[[[ 8  9 10 11]
  [20 21 22 23]]

 [[ 4  5  6  7]
  [16 17 18 19]]

 [[ 0  1  2  3]
  [12 13 14 15]]]

In [24]:

    

print(np.rot90(a_3d).shape)


    

    




(3, 2, 4)

In [25]:

    

print(a_3d[:, :, 0])


    

    




[[ 0  4  8]
 [12 16 20]]

In [26]:

    

print(np.rot90(a_3d)[:, :, 0])


    

    




[[ 8 20]
 [ 4 16]
 [ 0 12]]

In [27]:

    

print(np.rot90(a_3d, axes=(0, 1)))


    

    




[[[ 8  9 10 11]
  [20 21 22 23]]

 [[ 4  5  6  7]
  [16 17 18 19]]

 [[ 0  1  2  3]
  [12 13 14 15]]]

In [28]:

    

print(np.rot90(a_3d, axes=(1, 2)))


    

    




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

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

In [29]:

    

print(np.rot90(a_3d, axes=(1, 2)).shape)


    

    




(2, 4, 3)

In [30]:

    

print(np.rot90(a_3d, axes=(2, 1)))


    

    




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

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

In [31]:

    

print(np.rot90(a_3d, axes=(2, 1)).shape)


    

    




(2, 4, 3)

In [32]:

    

print(np.rot90(a_3d, 2, axes=(1, 2)))


    

    




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

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

In [33]:

    

print(np.rot90(a_3d, -1, axes=(1, 2)))


    

    




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

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