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NumPy · Function

np.intersect1d

Find the sorted, unique values shared by two arrays. You can also return the first matching index in each input.

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Syntax

numpy.intersect1d(ar1, ar2, assume_unique=False, return_indices=False)

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  • numpy.ma.intersect1d
  • functools.reduce

Source: numpy.intersect1d — NumPy v2.5 Manual. Checked 2026-11-03.