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std::gamma_distribution

性病：伽马[医]分布

Defined in header ​​
template< class RealType = double > class gamma_distribution;​(since C++11)

产生随机正浮点值x，按概率密度函数分布：P%28xα，β%29=。

E-x/β

*。

βα·Γ%28α%29

·xα-1

其中α被称为形形参数和β称为标度参数。形状参数有时用字母k表示，尺度参数有时用字母θ表示。

对于浮点α，得到的值是α独立的指数分布随机变量之和，其中每个变量的均值为β。

std::gamma_distribution满足RandomNumberDistribution...

模板参数

RealType-The result type generated by the generator. The effect is undefined if this is not one of float, double, or long double.

成员类型

Member typeDefinition
result_typeRealType
param_typethe type of the parameter set, see RandomNumberDistribution.

成员函数

(constructor)constructs new distribution (public member function)
resetresets the internal state of the distribution (public member function)

世代

运算符%28%29在分布%28公共成员函数%29中生成下一个随机数。

特征

Alphabeta返回分布参数%28公共成员函数%29

Param获取或设置分布参数对象%28公共成员函数%29

min返回最小潜在生成值%28公共成员函数%29

MAX返回最大潜在生成值%28公共成员函数%29

非会员职能

operator==operator!=compares two distribution objects (function)
operator<<operator>>performs stream input and output on pseudo-random number distribution (function template)

例

外部链接

韦斯斯坦，埃里克W.“伽玛分发”来自MathWorld的一个Wolfram Web资源。

 © cppreference.com

在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。

http：//en.cpPreference.com/w/cpp/数值/随机/伽马[医]分布

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