How to Delete Row in NumPy

This tutorial will introduce how to delete a row from a multi-dimensional NumPy array in Python.

Delete NumPy Row With the numpy.delete() Function

If we have a multi-dimensional NumPy array and want to delete a particular row from it, we can use the numpy.delete() function. The numpy.delete() function deletes entries at a specific index along a specified axis from a NumPy array. The numpy.delete() function takes the array, the index to be deleted, and the axis along which we want to delete as arguments and returns a sub-array in which the specified index along with the specified axis is deleted. The following code example shows us how we can delete a row from a multi-dimensional array with the numpy.delete() function.

import numpy as np

array = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])

array = np.delete(array, (1), axis=0)
print(array)

Output:

[[1 2 3]
 [7 8 9]]

We deleted the second row from the 2-dimensional NumPy array array with the np.delete() function in the above code. We first created the 2-dimensional NumPy array array with the np.array() function. Then we deleted the entries at index 1 along the axis 0, which is the second row of the array, and saved the result in array.