How to add a row in NumPy array

You can add a row in the NumPy array with the following code. If you want to learn Python, I highly recommend reading This Book.

Method 1: Add a row using the insert method

import numpy as np

# Original Numpy Array
a = np.array([[1, 2, 3],[4, 5, 6],[7, 8, 9]])

# New Row
b = [10, 20, 30]

# Add new row using insert method
c = np.insert(a, 2, b, axis=0)

# Display new array
print(c)

Output

[[ 1  2  3]
 [ 4  5  6]
 [10 20 30]
 [ 7  8  9]]

Method 2: Add a row using the append method

import numpy as np

# Original Numpy Array
a = np.array([[1, 2, 3],[4, 5, 6]])

# New Row
b = [[10, 15, 20]]

# Add new row using append method
c = np.append(a, b, axis=0)

# Display new array
print(c)

Output