stats_rand_gen_gamma
(PECL stats:1.0.0-1.0.2)
stats_rand_gen_gamma — Generates random deviates from a gamma distribution
说明
float stats_rand_gen_gamma
( float $a
, float $r
)
Generates random deviates 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
