root_numpy.dup_idx

root_numpy.dup_idx(arr)

Return the indices of all duplicated array elements.

Parameters:

arr : array-like object

An array-like object

Returns:

idx : NumPy array

An array containing the indices of the duplicated elements

Examples

>>> from root_numpy import dup_idx
>>> dup_idx([1, 2, 3, 4, 5])
array([], dtype=int64)
>>> dup_idx([1, 2, 3, 4, 5, 5])
array([4, 5])
>>> dup_idx([1, 2, 3, 4, 5, 5, 1])
array([0, 4, 5, 6])