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
© 1997–2017 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://secure.php.net/manual/en/function.log1p.php
