log1p --
Returns log(1 + number), computed in a way that is accurate even when
the value of number is close to zero
Syntax
float log1p ( float number )
Warning
This function is
EXPERIMENTAL. The behaviour of this function, the
name of this function, and anything else documented about this
function may change without notice in a future release of PHP.
Use this function at your own risk.
log1p() returns log(1 +
number) computed in a way that is accurante even
when the value of number is close to zero.
Note: This function is not
implemented on Windows platforms.
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Php log1p syntax tutorial
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