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log1p

(PHP 4 >= 4.1.0, PHP 5)

log1p Returns log(1 + number), computed in a way that is accurate even when the value of number is close to zero

Description

float log1p ( float $number )

log1p() returns log(1 + number) computed in a way that is accurate even when the value of number is close to zero. log() might only return log(1) in this case due to lack of precision.

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Parameters

number

The argument to process

Return Values

log(1 + number)

Changelog

Version Description
5.3.0 This function is now available on all platforms

See Also

  • expm1() - Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero
  • log() - Natural logarithm
  • log10() - Base-10 logarithm

 

 

 


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