How To Add Elements To NumPy Array (3 Examples) - Statology

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You can use the following methods to add one or more elements to a NumPy array:

Method 1: Append One Value to End of Array

#append one value to end of array new_array = np.append(my_array, 15)

Method 2: Append Multiple Values to End of Array

#append multiple values to end of array new_array = np.append(my_array, [15, 17, 18])

Method 3: Insert One Value at Specific Position in Array

#insert 95 into the index position 2 new_array = np.insert(my_array, 2, 95)

Method 4: Insert Multiple Values at Specific Position in Array

#insert 95 and 99 starting at index position 2 of the NumPy array new_array = np.insert(my_array, 2, [95, 99])

This tutorial explains how to use each method in practice with the following NumPy array:

import numpy as np #create NumPy array my_array = np.array([1, 2, 2, 3, 5, 6, 7, 10]) #view NumPy array my_array array([ 1, 2, 2, 3, 5, 6, 7, 10])

Example 1: Append One Value to End of Array

The following code shows how to use np.append() to append one value to the end of the NumPy array:

#append one value to end of array new_array = np.append(my_array, 15) #view new array new_array array([ 1, 2, 2, 3, 5, 6, 7, 10, 15])

The value 15 has been added to the end of the NumPy array.

Example 2: Append Multiple Values to End of Array

The following code shows how to use np.append() to append multiple values to the end of the NumPy array:

#append multiple values to end of array new_array = np.append(my_array, [15, 17, 18]) #view new array new_array array([ 1, 2, 2, 3, 5, 6, 7, 10, 15, 17, 18])

The values 15, 17, and 18 have been added to the end of the NumPy array.

Example 3: Insert One Value at Specific Position in Array

The following code shows how to insert one value into a specific position in the NumPy array:

#insert 95 into the index position 2 new_array = np.insert(my_array, 2, 95) #view new array new_array array([ 1, 2, 95, 2, 3, 5, 6, 7, 10])

The value 95 has been inserted into index position 2 of the NumPy array.

Example 4: Insert Multiple Values at Specific Position in Array

The following code shows how to insert multiple values starting at a specific position in the NumPy array:

#insert 95 and 99 starting at index position 2 of the NumPy array new_array = np.insert(my_array, 2, [95, 99]) #view new array new_array array([ 1, 2, 95, 99, 2, 3, 5, 6, 7, 10])

The values 95 and 99 have been inserted starting at index position 2 of the NumPy array.

Additional Resources

The following tutorials explain how to perform other common tasks in NumPy:

How to Filter a NumPy Array How to Remove NaN Values from NumPy Array How to Compare Two NumPy Arrays

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