template< class RealType = double >
class piecewise_constant_distribution;
std::piecewise_constant_distribution produces random floating-point numbers, which are uniformly distributed within each of the several subintervals [bi, bi+1), each with its own weight wi. The set of interval boundaries and the set of weights are the parameters of this distribution.
The probability density for any
bi ⤠x <bi+1is
, where
Sis the sum of all weights.
std::piecewise_constant_distribution satisfies all requirements of RandomNumberDistribution.
result_type (C++11) RealType param_type (C++11) the type of the parameter set, see RandomNumberDistribution. [edit] Member functions constructs new distribution
#include <iostream>
#include <map>
#include <random>
#include <string>
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 {}; n < 1e4; ++n)
++hist[d(gen)];
for (std::cout << std::hex << std::uppercase; auto [x, y] : hist)
std::cout << x << ' ' << std::string(y / 100, '*') << '\n';
}
Possible output:
0 ************************************************** A ********** B ********* C ********* D ********** E *********[edit] References
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