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std::gamma_distribution::gamma_distribution

性病：伽马[医]分布：：伽马[医]分布

explicit gamma_distribution( RealType alpha = 1.0, RealType beta = 1.0 (1)(since C++11)
explicit gamma_distribution( const param_type& params (2)(since C++11)

构造一个新的分发对象。第一个版本使用alpha和beta作为分发参数，第二个版本使用params作为分布参数。

参数

alpha-the α distribution parameter (shape)
beta-the β distribution parameter (scale)
params-the distribution parameter set

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