log1p
(PHP 4 >= 4.1.0, PHP 5, PHP 7)
log1p — Returns log(1 + number), computed in a way that is accurate even when the value of number is close to zero
Description
float log1p ( float $number ) log1p() returns log(1 + number) computed in a way that is accurate even when the value of number is close to zero. log() might only return log(1) in this case due to lack of precision.
Parameters
number
The argument to process
Return Values
log(1 + number)
Changelog
Version | Description |
|---|---|
5.3.0 | This function is now available on all platforms |
See Also
- expm1() - Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero
- log() - Natural logarithm
- log10() - Base-10 logarithm
← log10
log →
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