In [1]:

    

import numpy as np


    

In [2]:

    

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


    

    




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

In [3]:

    

a_slice = a_2d[:2, :2]
print(a_slice)


    

    




[[0 1]
 [4 5]]

In [4]:

    

print(np.shares_memory(a_2d, a_slice))


    

    




True

In [5]:

    

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


    

    




[[100   1]
 [  4   5]]

In [6]:

    

print(a_2d)


    

    




[[100   1   2   3]
 [  4   5   6   7]
 [  8   9  10  11]]

In [7]:

    

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


    

    




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

In [8]:

    

print(a_slice)


    

    




[[0 1]
 [4 5]]

In [9]:

    

a_fancy_index = a_2d[[0, 1]]
print(a_fancy_index)


    

    




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

In [10]:

    

print(np.shares_memory(a_2d, a_fancy_index))


    

    




False

In [11]:

    

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


    

    




[[100   1   2   3]
 [  4   5   6   7]]

In [12]:

    

print(a_2d)


    

    




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

In [13]:

    

a_slice_copy = a_2d[:2, :2].copy()
print(a_slice_copy)


    

    




[[0 1]
 [4 5]]

In [14]:

    

print(np.shares_memory(a_2d, a_slice_copy))


    

    




False

In [15]:

    

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


    

    




[[100   1]
 [  4   5]]

In [16]:

    

print(a_2d)


    

    




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

In [17]:

    

a_fancy_index_slice = a_2d[[0, 1], :3]
print(a_fancy_index_slice)


    

    




[[0 1 2]
 [4 5 6]]

In [18]:

    

print(np.shares_memory(a_2d, a_fancy_index_slice))


    

    




False

In [19]:

    

a_scalar_slice = a_2d[1, :3]
print(a_scalar_slice)


    

    




[4 5 6]

In [20]:

    

print(np.shares_memory(a_2d, a_scalar_slice))


    

    




True