# Python program explaining 
# where() function 
  
import numpy as np
  
np.where([[True, False], [True, True]],
         [[1, 2], [3, 4]], [[5, 6], [7, 8]])

array([[1, 6],
       [3, 4]])

# Python program explaining 
# where() function 
  
import numpy as np
  
# a is an array of integers.
a = np.array([[1, 2, 3], [4, 5, 6]])
  
print(a)
  
print ('Indices of elements <4')
  
b = np.where(a<4)
print(b)
  
print("Elements which are <4")
print(a[b])

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

Indices of elements <4
(array([0, 0, 0], dtype=int64), array([0, 1, 2], dtype=int64))

Elements which are <4
array([1, 2, 3])