get_uniques_positions

skrough.unique.get_uniques_positions(values: ndarray) → ndarray

Get positions of first occurrences of unique values.

Get positions/indices for which unique values in the input array appear for the first time. The indices are reported in the order corresponding to the ascending order of unique values, i.e., the first index indicates the first occurrence of the lowest unique value, the second index indicates the first occurrence of the second lowest unique value, etc.

Parameters:

values – Input array.

Returns:

The positions/indices of the input array for which unique values (reported in ascending order) appear for the first time.

Examples

>>> get_uniques_index(np.array([1, 2, 3]))
array([0, 1, 2])
>>> get_uniques_index(np.array([3, 2, 1]))
array([2, 1, 0])
>>> get_uniques_index(np.array([1, 1, 1]))
array([0])
>>> get_uniques_index(np.array([1, 1, 2, 1]))
array([0, 2])
>>> get_uniques_index(np.array([2, 2, 1, 2]))
array([2, 0])
>>> get_uniques_index(np.array([]))
array([])