Sometimes, we want to add an extra column to a NumPy array with Python.
In this article, we’ll look at how to add an extra column to a NumPy array with Python.
How to add an extra column to a NumPy array with Python?
To add an extra column to a NumPy array with Python, we can use the append method.
For instance, we write:
import numpy as np
a = np.array([[1,2,3],[2,3,4]])
z = np.zeros((2,1), dtype=np.int64)
b = np.append(a, z, axis=1)
print(b)
We create the array a with np.array.
Then we call np.zeroes with the dimensions of the array passed in as a tuple and the data type set as the value of dtype.
Then we call append with a and z to append z to a.
It returns a new array and we assign that to b.
Therefore, b is:
[[1 2 3 0]
[2 3 4 0]]
Conclusion
To add an extra column to a NumPy array with Python, we can use the append method.
