std::lognormal_distribution

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C++
 
Numerics的图书馆
常见的数学函数
浮点环境
复数
数字阵列
伪随机数生成
编译时合理的算法 （C++11）
通用的数值运算
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Generic numeric operations
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accumulate
inner_product
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伪随机数生成
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发电机
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分布
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均匀分布
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Uniform distributions
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正态分布
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Normal distributions
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normal_distribution（C++11）
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C library
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std::lognormal_distribution
成员函数
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Member functions
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lognormal_distribution::lognormal_distribution
lognormal_distribution::reset
代
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Generation
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lognormal_distribution::operator()
特性
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Characteristics
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lognormal_distribution::param
lognormal_distribution::min
lognormal_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 lognormal_distribution;
 （C++11 起）
lognormal_distribution随机数分布产生随机数x > 0根据对数正态的分布
Original:
The lognormal_distribution random number distribution produces random numbers x > 0 according to a log-normal distribution:
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f(x; m,s) = None
1
sx√2 π
exp⎛
⎜
⎝- None
(ln x - m)2
2s2
⎞
⎟
⎠
的参数m的均值和参数s标准偏差.
Original:
The parameter m is the mean and the parameter s the standard deviation.
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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 RealType
param_type
的类型的参数集，未指定
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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
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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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（m）返回的平均分布参数
Original:
returns the mean (m) distribution parameter
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（公共成员函数） [edit]
返回的标准偏差（s）分布参数
Original:
returns the standard deviation (s) distribution parameter
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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

#include <iostream>
#include <iomanip>
#include <string>
#include <map>
#include <random>
#include <cmath>
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
 
    std::lognormal_distribution<> d(1.6, 0.25);
 
    std::map<int, int> hist;
    for(int n=0; n<10000; ++n) {
        ++hist[std::round(d(gen))];
    }
    for(auto p : hist) {
        std::cout << std::fixed << std::setprecision(1) << std::setw(2)
                  << p.first << ' ' << std::string(p.second/200, '*') << '\n';
    }
}

Output: 

2 
 3 ***
 4 *************
 5 ***************
 6 *********
 7 ****
 8 *
 9 
10 
11 
12

[编辑] 外部链接

来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/numeric/random/lognormal_distribution&oldid=28052”