expm1
(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
Description
float expm1 ( float $arg ) 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.
Parameters
arg
The argument to process
Return Values
'e' to the power of arg minus one
Changelog
Version | Description |
|---|---|
5.3.0 | This function is now available on all platforms |
See Also
- log1p() - Returns log(1 + number), computed in a way that is accurate even when the value of number is close to zero
- exp() - Calculates the exponent of e
← exp
floor →
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