How do I concatenate NumPy arrays in Python?

How do I concatenate NumPy arrays in Python?

You can use the numpy.concatenate() function to concatenate two or more arrays along a specified axis.

Can you show me an example of concatenating two 1D arrays?

Sure! Here's an example:

import numpy as np

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

result = np.concatenate((a, b))
print(result)  # Output: [1 2 3 4 5 6]

What if I want to concatenate 2D arrays?

For 2D arrays, you can still use numpy.concatenate(), but you need to specify the axis. For example:

import numpy as np

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

result = np.concatenate((a, b.T), axis=0)
print(result)
# Output:
# [[1 2]
#  [3 4]
#  [5 6]]