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 $num ) : float

expm1() returns the equivalent to 'exp(num) - 1' computed in a way that is accurate even if the value of num is near zero, a case where 'exp (num) - 1' would be inaccurate due to subtraction of two numbers that are nearly equal.

Parametri

num

The argument to process

Valorile întoarse

'e' to the power of num minus one

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