In [1]:

    

import numpy as np


    

In [2]:

    

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


    

    




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

In [3]:

    

print(a < 4)


    

    




[[ True  True  True  True]
 [False False False False]
 [False False False False]]

In [4]:

    

print(a % 2 == 1)


    

    




[[False  True False  True]
 [False  True False  True]
 [False  True False  True]]

In [5]:

    

print(np.count_nonzero(a < 4))


    

    




4

In [6]:

    

print(np.count_nonzero(a % 2 == 1))


    

    




6

In [7]:

    

print(np.sum(a < 4))


    

    




4

In [8]:

    

print(np.sum(a % 2 == 1))


    

    




6

In [9]:

    

print(np.count_nonzero(a < 4, axis=0))


    

    




[1 1 1 1]

In [10]:

    

print(np.count_nonzero(a < 4, axis=1))


    

    




[4 0 0]

In [11]:

    

print(np.count_nonzero(a % 2 == 1, axis=0))


    

    




[0 3 0 3]

In [12]:

    

print(np.count_nonzero(a % 2 == 1, axis=1))


    

    




[2 2 2]

In [13]:

    

print(np.any(a < 4))


    

    




True

In [14]:

    

print(np.any(a > 100))


    

    




False

In [15]:

    

print(np.any(a < 4, axis=0))


    

    




[ True  True  True  True]

In [16]:

    

print(np.any(a < 4, axis=1))


    

    




[ True False False]

In [17]:

    

print(np.all(a < 4))


    

    




False

In [18]:

    

print(np.all(a < 100))


    

    




True

In [19]:

    

print(np.all(a < 4, axis=0))


    

    




[False False False False]

In [20]:

    

print(np.all(a < 4, axis=1))


    

    




[ True False False]

In [21]:

    

print((a < 4) | (a % 2 == 1))


    

    




[[ True  True  True  True]
 [False  True False  True]
 [False  True False  True]]

In [22]:

    

print(np.count_nonzero((a < 4) | (a % 2 == 1)))


    

    




8

In [23]:

    

print(np.count_nonzero((a < 4) | (a % 2 == 1), axis=0))


    

    




[1 3 1 3]

In [24]:

    

print(np.count_nonzero((a < 4) | (a % 2 == 1), axis=1))


    

    




[4 2 2]