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.