expm1

Example

 float expm1 ( float $arg ) 

Description

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.

Return Values

'e' to the power of arg minus one