PHP Manual
Prev |  | Next

# log1p

(PHP 4 >= 4.1.0, PHP 5)

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 )

Warning
This function is EXPERIMENTAL. The behaviour of this function, the name of this function, and anything else documented about this function may change without notice in a future release of PHP. Use this function at your own risk.

log1p() returns log(1 + number) computed in a way that is accurante even when the value of number is close to zero.

> Note: This function is not implemented on Windows platforms.

See also expm1() and log().

Prev | Home | Next
log10 | Up | log