How to append in NumPy array

You can use the append function in the NumPy array with the following code. If you want to learn Python, I highly recommend reading This Book.

Example 1: How to append two NumPy arrays

import numpy as np
a = np.array([1, 2, 3])
b = np.array([4, 5, 6])
c = np.append(a, b)
print(c)

[1 2 3 4 5 6]

Example 2: How to append an element to the NumPy array

import numpy as np
a = np.array([1, 2, 3])
b = np.append(a, 6)
print(b)

[1 2 3 6]

Example 3: How to append column in NumPy array

import numpy as np
a = np.array([[1, 2],[3, 4],[5,6]])
b = [[7],[8],[9]]
c = np.append(a, b, axis=1)
print(c)

[[1 2 7]
 [3 4 8]
 [5 6 9]]

Example 4: How to append row in NumPy array

import numpy as np
a = np.array([[1, 2, 3],[4, 5, 6]])
b = [[7, 8, 9]]
c = np.append(a, b, axis=0)
print(c)

[[1 2 3]
 [4 5 6]
 [7 8 9]]

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