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numpy.ndarray.fill () in Python

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If we need to initialize a numpy array with the same value then we use numpy.ndarray.fill (). Suppose we have to create a NumPy array of of length n, each element of which is v. Then we use this function a.fill (v). We don’t need to use loops to initialize the array if we use this fill () function.

Syntax : ndarray.fill (value)

Parameters:
value: All elements of a will be assigned this value.

Code # 1:

# Python program explaining
# numpy.ndarray.fill () function

import numpy as geek

 

a = geek.empty ([ 3 , 3 ])

  
# Initialize each element in the array
# with 1 using nested loops

for i in range ( 3 ):

for j in range ( 3 ):

a [i] [j] = 1

 

print ( "a is:" , a) 

 

  
# now we initialize each element
# of the array with 1 using the fill function ().

a.fill ( 1 )

 

print ( "After using fill () a is:" , a)

 

Output:

 a is: [[1. 1. 1.] [1. 1. 1.] [1. 1. 1.]] After using fill () a is: [[1. 1. 1.] [1. 1. 1.] [1. 1. 1.]] 

Code # 2:

# Python program explaining
# numpy.ndarray.fill () function

import numpy as geek

 

a = geek.arange ( 5 )

 

print ( "a is" , a)

 
# Using the fill () method

a.fill ( 0 )

 

print ( "Now a is:" , a)

 

Exit:

 a is [0 1 2 3 4] Now a is : [0 0 0 0 0] 

Code # 3: numpy.ndarray.fill () also works with multidimensional arrays.

# Python program explaining
# numpy.ndarray.fill () function

 

import numpy as geek

 

a = geek.empty ([ 3 , 3 ])

 
# Using the fill () method

a.fill ( 0 )

 

print ( "a is:" , a)

Exit :

 a is: [[0. 0. 0.] [0. 0. 0.] [0. 0. 0.]] 

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