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NumPy · Function

np.setdiff1d

np.setdiff1d returns the unique values in one array that are missing from another. By default, it returns the result in sorted order.

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Syntax

numpy.setdiff1d(ar1, ar2, assume_unique=False)

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Source: numpy.setdiff1d — NumPy v2.5 Manual. Checked 2026-11-03.