stats_dens_exponential
(PECL stats >= 1.0.0)
stats_dens_exponential — Probability density function of the exponential distribution
说明
stats_dens_exponential
( float
$x
, float $scale
) : float
Returns the probability density at x, where the
random variable follows the exponential distribution of which the scale is
scale.
参数
-
x -
The value at which the probability density is calculated
-
scale -
The scale of the distribution
返回值
The probability density at x or FALSE for failure.