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PHP5中文手册
stats_rand_gen_beta(PECL stats:1.0.0-1.0.2) stats_rand_gen_beta — Generates beta random deviate 说明
float stats_rand_gen_beta
( float $a
, float $b
)
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
返回值
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