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numpy.nan ⚬｜Documentation｜1st｜20251021151459-00-⌔

Constants — NumPy v2 Manual#numpy.nan

numpy.nan

IEEE 754 floating point representation of Not a Number (NaN).

Returns:

y: A floating point representation of Not a Number.

See Also:

isnan: Shows which elements are Not a Number.

isfinite: Shows which elements are finite (not one of Not a Number, positive infinity and negative infinity)

Notes:

NumPy uses the IEEE Standard for Binary Floating-Point for Arithmetic (IEEE 754). This means that Not a Number is not equivalent to infinity.

Examples:

>>> import numpy as np
>>> np.nan
nan
>>> np.log(-1)
np.float64(nan)
>>> np.log([-1, 1, 2])
array([       nan, 0.        , 0.69314718])

Printed 2026-06-28.

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