Correct frexp() docs for non-finite numbers#149753
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The current version claims, that mantissa in such cases satisfies 0.5 <= abs(m) < 1. That's wrong: ```pycon >>> from math import frexp, inf, nan >>> frexp(inf) (inf, 0) >>> frexp(-inf) (-inf, 0) >>> frexp(nan) (nan, 0) ```
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CC @StanFromIreland per experts index. |
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Hi Sergey, sorry but I'm not a math expert :-( The "documentation" is generally referring to it the infra. |
| returns ``(0.0, 0)``, otherwise ``0.5 <= abs(m) < 1``. This is used to "pick | ||
| apart" the internal representation of a float in a portable way. | ||
| Return the mantissa and exponent of *x* as the pair ``(m, e)``. *m* is a | ||
| float and *e* is an integer such that ``x == m * 2**e`` exactly. If *x* |
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This is worded a little oddly, since this seems to allow nan == nan.
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The current version claims, that mantissa in such cases satisfies 0.5 <= abs(m) < 1. That's wrong: