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bundles / numpy 2.4.3 / numpy / ma / extras / unique

function

numpy.ma.extras:unique

source: /numpy/ma/extras.py:1267

Signature

def unique(ar1, return_index = False, return_inverse = False)

Summary

Finds the unique elements of an array.

Extended Summary

Masked values are considered the same element (masked). The output array is always a masked array. See numpy.unique for more details.

Examples

import numpy as np
a = [1, 2, 1000, 2, 3]
mask = [0, 0, 1, 0, 0]
masked_a = np.ma.masked_array(a, mask)
✓
masked_a
np.ma.unique(masked_a)
np.ma.unique(masked_a, return_index=True)
np.ma.unique(masked_a, return_inverse=True)
np.ma.unique(masked_a, return_index=True, return_inverse=True)
✗
(masked_array(data=[1, 2, 3, --],
             mask=[False, False, False,  True],
       fill_value=999999), array([0, 1, 4, 2]), array([0, 1, 3, 1, 2]))

See also

numpy.unique

Equivalent function for ndarrays.

Aliases

  • numpy.ma.unique