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std::normal_distribution::normal_distribution

性病：正常[医]分配：：正常[医]分布

explicit normal_distribution( RealType mean = 0.0, RealType stddev = 1.0 (1)(since C++11)
explicit normal_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mean和stddev作为分发参数，第二个版本使用params作为分布参数。

参数

mean-the μ distribution parameter (mean)
stddev-the σ distribution parameter (standard deviation)
params-the distribution parameter set

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