std::piecewise_constant_distribution

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编译时合理的算法 （C++11）
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分布
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Uniform distributions
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std::piecewise_constant_distribution
成员函数
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Member functions
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piecewise_constant_distribution::piecewise_constant_distribution
piecewise_constant_distribution::reset
代
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Generation
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piecewise_constant_distribution::operator()
特性
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Characteristics
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piecewise_constant_distribution::intervals
piecewise_constant_distribution::densities
piecewise_constant_distribution::param
piecewise_constant_distribution::min
piecewise_constant_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 RealType = double >
class piecewise_constant_distribution;
 （C++11 起）
std::piecewise_constant_distribution产生随机的浮点数，它被均匀地分布在每一个的多个子区间[b
i, b
i+1)，每个都有其自身的重量w
i。间隔边界的组和组的权重，该分布的参数.
Original:
std::piecewise_constant_distribution produces random floating-point numbers, which are uniformly distributed within each of the several subintervals [b
i, b
i+1), each with its own weight w
i. The set of interval boundaries and the set of weights are the parameters of this distribution.
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的概率密度的任何b
i≤x<b
i+1None
w
k
S (b
i+1 - b
i)
。 S是所有的权重的总和.....
Original:
The probability density for any b
i≤x<b
i+1 is None
w
k
S (b
i+1 - b
i)
. where S is the sum of all weights.
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目录

[编辑] 会员类型

会员类型
Original:
Member type
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 Definition
result_type RealType
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
Original:
Generation
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生成下一个随机数的分布
Original:
generates the next random number in the distribution
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（公共成员函数） [edit]
特性
Original:
Characteristics
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获得间隔边界的列表
Original:
obtains the list of interval boundaries
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（公共成员函数） [edit]
获得概率密度列表
Original:
obtains the list of probability densities
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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
Original:
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

#include <iostream>
#include <string>
#include <map>
#include <random>
 
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
    // 50% of the time, generate a random number between 0 and 1
    // 50% of the time, generate a random number between 10 and 15
    std::vector<double> i{0,  1, 10, 15};
    std::vector<double> w{  1,  0,  1};
    std::piecewise_constant_distribution<> d(i.begin(), i.end(), w.begin());
 
    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 **************************************************
10 **********
11 *********
12 *********
13 **********
14 *********
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/numeric/random/piecewise_constant_distribution&oldid=27758”