How To Remove Elements From Numpy Array?
Table Of Contents:
- np.delete( )
- Examples Of np.delete() Method.
(1) np.delete( )
- A copy of arr with the elements specified by obj removed.
- Note that
deletedoes not occur in-place. - If axis is None, out is a flattened array.
Syntax:
numpy.delete(arr, obj, axis=None)Parameters:
- arr: array_like – Input array.
- obj: slice, int or array of ints – Indicate indices of sub-arrays to remove along the specified axis.
- axis: int, optional – The axis along which to delete the subarray defined by obj. If axis is None, obj is applied to the flattened array.
Returns:
- out: ndarray – A copy of arr with the elements specified by obj removed. Note that
deletedoes not occur in-place. If axis is None, out is a flattened array.
(2) Examples Of np.delete()
Example-1:
import numpy as np
a = np.array([3,1,5,2,6,3,7,4,1])
np.delete(a,obj=[3])Output:
array([3, 1, 5, 6, 3, 7, 4, 1])Note:
- It will remove the element at index position ‘3’.
Example-2:
arr = np.arange(12) + 1
arrarray([ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12])np.delete(arr,obj=[0,2,4], axis=0)Output:
array([ 2, 4, 6, 7, 8, 9, 10, 11, 12])Note:
- It will remove the element at index positions ‘0’, ‘2’, and ‘4’.