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

Descrierea

expm1 ( float $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.

Parametri

arg

The argument to process

Valorile întoarse

'e' to the power of arg minus one

Istoricul schimbărilor

Versiune Descriere
5.3.0 This function is now available on all platforms

A se vedea și

  • 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