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std::chi_squared_distribution::chi_squared_distribution

性病：CHI[医]平方[医]分布：：CHI[医]平方[医]分布

explicit chi_squared_distribution( RealType n = 1.0 (1)(since C++11)
explicit chi_squared_distribution( const param_type& params (2)(since C++11)

构造新的分发对象。第一个版本使用n作为分发参数，第二个版本使用params作为分布参数。

参数

n-the n distribution parameter (degrees of freedom)
params-the distribution parameter set

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