NumPy delete()

delete() Syntax

The syntax of delete() is:

numpy.delete(array, obj, axis = None)

delete() Arguments

The delete() method takes four arguments:

• array - array to delete elements from
• obj - indices at which values are deleted
• axis(optional) - the axis along which the values are deleted

Note: By default, axis is None, and the array is flattened.

delete() Return Value

The delete() method returns an array with values deleted.

Example 1: Delete an Array Element at Given Index

Output

[0 1 3]

Example 2: Delete an Array Element at Given Indices

We can delete different array elements at different indices.

Output

[0 3]

Example 3: Delete Element of a 2-D Array

Similar to a 1-D array, we can delete elements from a 2-D array at any index.

We can also delete an entire row or column using the axis parameter. If axis = 0, row is deleted and if axis = 1, column is deleted.

Output

Array after deleting element at index 1
[0 2 3]

Array after deleting row 1
 [[0 1]]

Array after deleting column 1
 [[0]
 [2]]

Example 4: Delete Multiple Elements of a 2-D Array

Output

Array after deleting elements at indices 0 and 1
[ 2  3  4  5  6  7  8  9 10 11]

Array after deleting row 0 and 1
 [[ 6  7  8]
 [ 9 10 11]]

Array after deleting column 0 and 1
 [[ 2]
 [ 5]
 [ 8]
 [11]]

Example 5: Delete Array Based on Conditions

We can also use delete() to eliminate the items of an array that satisfy a given condition.

Output

Array after deleting odd elements 
[0 2 4]