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std::weibull_distribution

STD：威布尔[医]分布

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

大weibull_distribution满足RandomNumberDistribution并根据威布尔分布F%28x；a，b%29=

阿

*。

乙

二次

二次

二次

X

*。

乙

二次

二次

a-1

EXP

二次

二...

二次

二次

X

*。

乙

二次

二次

A类

二次

二次

二次

A是形状参数和b尺度参数...

std::weibull_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

AB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

二次

#include <iostream>
#include <iomanip>
#include <string>
#include <map>
#include <random>
#include <cmath>
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd()
 
    std::weibull_distribution<> d;
 
    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';
    }
}

二次

产出：

二次

0 *******************
 1 *******************
 2 ******
 3 **
 4 
 5 
 6 
 7 
 8

二次

外部链接

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http：//en.cppreference.com/w/cpp/数值/随机/Weibull[医]分布

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