expm1
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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Licensed under the Creative Commons Attribution License v3.0 or later.
