stats_rand_gen_gamma
(PECL stats >= 1.0.0)
stats_rand_gen_gamma — Generates a random deviate from the gamma distribution
说明
stats_rand_gen_gamma (
float
$a
,
float $r
) :
float
Generates a random deviate from the gamma distribution whose density is (A**R)/Gamma(R) * X**(R-1) * Exp(-A*X).
参数
-
a
-
location parameter of Gamma distribution (
a
> 0). -
r
-
shape parameter of Gamma distribution (
r
> 0).
返回值
A random deviate