# 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