stats_rand_gen_beta
(PECL stats >= 1.0.0)
stats_rand_gen_beta — Generates a random deviate from the beta distribution
说明
stats_rand_gen_beta (
float
$a
,
float $b
) :
float
Returns a random deviate from the beta distribution with parameters A and B. The density of the beta is x^(a-1) * (1-x)^(b-1) / B(a,b) for 0 < x <. Method R. C. H. Cheng.
参数
-
a
-
The shape parameter of the beta distribution
-
b
-
The shape parameter of the beta distribution
返回值
A random deviate