std::geometric_distribution

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std::geometric_distribution
成员函数
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Member functions
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geometric_distribution::geometric_distribution
geometric_distribution::reset
代
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Generation
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geometric_distribution::operator()
特性
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Characteristics
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geometric_distribution::p
geometric_distribution::param
geometric_distribution::min
geometric_distribution::max
非成员函数
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Non-member functions
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operator==
operator!=
operator<<
operator>>
 
Defined in header <random>
template< class IntType = int >
class geometric_distribution;
 （C++11 起）
产生随机的非负整数值i根据离散概率函数，分布：
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Produces random non-negative integer values i, distributed according to discrete probability function:
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P(i|p) = p · (1 − p)i
该值表示的是/否试验（每个成功概率p）是必要的，以获得单成功.
Original:
The value represents the number of yes/no trials (each succeeding with probability p) which are necessary to obtain a single success.
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std::geometric_distribution<>(p)是完全等同于std::negative_binomial_distribution<>(1, p)。它也是对应的离散的std::exponential_distribution.
Original:
std::geometric_distribution<>(p) is exactly equivalent to std::negative_binomial_distribution<>(1, p). It is also the discrete counterpart of std::exponential_distribution.
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目录

[编辑] 会员类型

会员类型
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Member type
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 Definition
result_type IntType
param_type
的类型的参数集，未指定
Original:
the type of the parameter set, unspecified
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[编辑] 成员函数
构建新的分配
Original:
constructs new distribution
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（公共成员函数） [edit]
复位内部状态的分布
Original:
resets the internal state of the distribution
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（公共成员函数） [edit]
代
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Generation
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生成下一个随机数的分布
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generates the next random number in the distribution
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（公共成员函数） [edit]
特性
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Characteristics
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返回“P”分布参数（概率的审判产生true）
Original:
returns the p distribution parameter (probability of a trial generating true)
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（公共成员函数） [edit]
获取或设置的分布参数对象
Original:
gets or sets the distribution parameter object
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（公共成员函数） [edit]
返回的最低可能产生的价值
Original:
returns the minimum potentially generated value
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（公共成员函数） [edit]
返回的最大潜在价值
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returns the maximum potentially generated value
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（公共成员函数） [edit]

[编辑] 非成员函数
比较两个分布对象
Original:
compares two distribution objects
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（函数） [edit]
执行流输入和输出的伪随机数分布
Original:
performs stream input and output on pseudo-random number distribution
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（函数） [edit]

[编辑] 为例

geometric_distribution <>（0.5）默认情况下，表示需要得到头掷硬币的数量
Original:
geometric_distribution<>(0.5) is the default and represents the number of coin tosses that are required to get heads
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#include <iostream>
#include <iomanip>
#include <string>
#include <map>
#include <random>
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
 
    std::geometric_distribution<> d; // same as std::negative_binomial_distribution<> d(1, 0.5);
 
    std::map<int, int> hist;
    for(int n=0; n<10000; ++n) {
        ++hist[d(gen)];
    }
    for(auto p : hist) {
        std::cout << p.first <<
                ' ' << std::string(p.second/100, '*') << '\n';
    }
}

Output: 

0 *************************************************
1 *************************
2 ************
3 ******
4 **
5 *
6 
7 
8 
9 
10 
11

[编辑] 外部链接

Weisstein, Eric W. "Geometric Distribution."，从MathWorld - Wolfram网络资源.
Original:
Weisstein, Eric W. "Geometric Distribution." From MathWorld--A Wolfram Web Resource.
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来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/numeric/random/geometric_distribution&oldid=28242”