Generates a random deviate from the exponential distribution

# stats_rand_gen_exponential

(PECL stats >= 1.0.0)

stats_rand_gen_exponential — Generates a random deviate from the exponential distribution

### 説明

function stats_rand_gen_exponential(float `$av`): float

Returns a random deviate from the exponential distribution of which the scale is `av`.

### パラメータ

`av`
  The scale parameter

### 戻り値

A random deviate

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