log1p
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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Licensed under the Creative Commons Attribution License v3.0 or later.
