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How to create an empty and a full NumPy array?

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NumPy is a crucial library for performing numerical computations in Python. It offers robust array objects that enable efficient manipulation and operations on extensive datasets. Creating NumPy arrays is an essential process in scientific computing and data analysis. In this article, we will explore how to create both empty and full NumPy arrays, understanding the different methods and their applications.

Create an Empty Numpy Array

To create an empty NumPy array, we can use the numpy.empty() function. The empty() function in NumPy is used to create an empty array with a specified shape. An empty NumPy array is an array that is initialized with arbitrary values, and its shape is determined by the user. An array in NumPy that is empty has random values as its initial values, and the user specifies how it should be shaped.

Python3

import numpy as np
 
empty_array_2d = np.empty((3, 4))
print(empty_array_2d)

                    

Output

[[6.57072021e-310 0.00000000e+000 9.17479904e-321 4.82480074e-310]
 [6.57068335e-310 6.57068335e-310 6.57068335e-310 6.57068335e-310]
 [0.00000000e+000 4.94065646e-324 2.12199579e-314 4.44659081e-323]]

Create a Full Numpy Array

To create a full NumPy array, you can use the numpy.full() function. The full() function in NumPy creates an array of a given shape and fills it with a specified value. A full NumPy array is an array where all the elements have the same predefined value. This is useful when you want to initialize an array with a specific value.

Python3

import numpy as np
 
full_array_2d = np.full((3, 4), 5)
print(full_array_2d)

                    

Output

[[5 5 5 5]
 [5 5 5 5]
 [5 5 5 5]]

Create an Empty and a Full NumPy Array

Sometimes there is a need to create an empty and full array simultaneously for a particular question. In this situation, we have two functions named numpy.empty() and numpy. full() to create an empty and full array. Here we will see different examples:

Example 1: In the example, we create an empty array of 3X4 and a full array of 3X3 of INTEGER type.

Python3

import numpy as np
 
 
# Create an empty array
empa = np.empty((3, 4), dtype=int)
print("Empty Array")
print(empa)
 
# Create a full array
flla = np.full([3, 3], 55, dtype=int)
print("\n Full Array")
print(flla)

                    

Output

Example 2: In the example, we create an empty array of 4X2 and a full array of 4X3 of INTEGER and FLOAT type.

Python3

# python program to create
# Empty and Full Numpy arrays
 
import numpy as np
 
 
# Create an empty array
empa = np.empty([4, 2])
print("Empty Array")
print(empa)
 
# Create a full array
flla = np.full([4, 3], 95)
print("\n Full Array")
print(flla)

                    

Output

Create an Empty Numpy Array

Example 3: In the example, we create an empty array of 3X3 and a full array of 5X3 of FLOAT type.

Python3

# python program to create
# Empty and Full Numpy arrays
 
import numpy as np
 
# Create an empty array
empa =  np.empty([3,3])
print("Empty Array")
print(empa)
 
# Create a full array
flla = np.full([5,3], 9.9)
print("\n Full Array")
print(flla)

                    

Output

Create a Full Numpy Array




Last Updated : 07 Aug, 2023
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