python-scipyHow do I use the append function in Python Numpy?

The append() function in Python Numpy is used to combine two arrays. It takes in two parameters, the first being the array to which the other is appended. The second parameter is the array which is appended to the first. The append() function returns a new array with the two combined.

Example

import numpy as np

arr1 = np.array([1, 2, 3])
arr2 = np.array([4, 5, 6])

arr3 = np.append(arr1, arr2)

print(arr3)

Output example

[1 2 3 4 5 6]

The code above imports the Numpy library, then creates two arrays, arr1 and arr2, and assigns them values. The append() function is then used to combine the two arrays, with arr1 as the first parameter and arr2 as the second. The append() function returns a new array, arr3, which is printed out.

Parts of the code:

• import numpy as np: imports the Numpy library
• arr1 = np.array([1, 2, 3]): creates an array called arr1 and assigns it the values 1, 2, and 3
• arr2 = np.array([4, 5, 6]): creates an array called arr2 and assigns it the values 4, 5, and 6
• arr3 = np.array.append(arr1, arr2): uses the append() function to combine arr1 and arr2 into a new array called arr3
• print(arr3): prints out the contents of arr3

Helpful links

• Numpy append() function documentation
• Python Numpy Tutorial

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