std::piecewise_constant_distribution
Defined in header <random> | ? | ? |
|---|---|---|
template< class RealType = double > class piecewise_constant_distribution; | ? | (since C++11) |
std::piecewise_constant_distribution产生随机浮点数，这些数字在几个子区间中的每个子区间内均匀分布。[乙
一，乙
I+1%29，每个都有自己的重量w
一、区间边界集合和权值集是这种分布的参数。任何b的概率密度。
I≤x<b
I+1是
wk
*。
S%28 bi+1-bi%29
，其中S是所有权重之和。
std::piecewise_constant_distribution满足…的所有要求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 type | Definition |
|---|---|
result_type | RealType |
param_type | the type of the parameter set, see RandomNumberDistribution. |
成员函数
(constructor) | constructs new distribution (public member function) |
|---|---|
reset | resets 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
中间值密度返回分布参数%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 <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';
}
}二次
产出：
二次
0 **************************************************
10 **********
11 *********
12 *********
13 **********
14 *********二次
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