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NumPy · Function

np.isnan

Checks each input value for NaN. It returns True for NaN and False for other values, including infinity.

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Syntax

numpy.isnan(x, /, out=None, *, where=True, casting='same_kind', order='K', dtype=None, subok=True[, signature]) = <ufunc 'isnan'>

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  • isinf
  • isneginf
  • isposinf
  • isfinite
  • isnat

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