python-scipyHow do I join two arrays in Python using NumPy?

Joining two arrays in Python using NumPy is a fairly straightforward process. It can be done using the np.concatenate() function. This function takes a tuple or list of arrays to join together.

For example, if we have two NumPy arrays a and b, we can join them together using np.concatenate() like this:

import numpy as np

a = np.array([1, 2, 3])
b = np.array([4, 5, 6])

c = np.concatenate((a, b))

print(c)

The output of the above code would be:

[1 2 3 4 5 6]

The np.concatenate() function takes the following parameters:

• tuple or list of arrays to join together
• axis: The axis along which the arrays will be joined. If it is not specified, it defaults to 0.

Code explanation

1. import numpy as np: Imports the NumPy library.
2. a = np.array([1, 2, 3]): Creates a NumPy array a with the values [1, 2, 3].
3. b = np.array([4, 5, 6]): Creates a NumPy array b with the values [4, 5, 6].
4. c = np.concatenate((a, b)): Joins the arrays a and b together using np.concatenate().
5. print(c): Prints the resulting array c.

Helpful links

• NumPy Documentation: np.concatenate

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