(PHP 4 >= 4.1.0, PHP 5, PHP 7)
expm1 — Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero
$arg
) : float
expm1() returns the equivalent to
'exp(arg) - 1' computed in a way that is
accurate even if the value of arg is near zero,
a case where 'exp (arg) - 1' would be
inaccurate due to subtraction of two numbers that are nearly equal.
argThe argument to process
'e' to the power of arg minus one
| Version | Description |
|---|---|
| 5.3.0 | This function is now available on all platforms |