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expm1

(PHP 4 >= 4.1.0, PHP 5)

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.

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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

 
 

Execute expm1( $number );

$number =


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