template< class IntType = int >
class geometric_distribution;
Produces random non-negative integer values i, distributed according to discrete probability function:
The value represents the number of failures in a series of independent yes/no trials (each succeeds with probability p), before exactly 1 success occurs.
std::geometric_distribution<>(p) is exactly equivalent to std::negative_binomial_distribution<>(1, p). It is also the discrete counterpart of std::exponential_distribution.
std::geometric_distribution satisfies RandomNumberDistribution.
result_type (C++11) IntType param_type (C++11) the type of the parameter set, see RandomNumberDistribution. [edit] Member functions constructs new distribution
std::geometric_distribution<>(0.5) is the default and represents the number of coin tosses that are required to get heads.
#include <iomanip>
#include <iostream>
#include <map>
#include <random>
#include <string>
int main()
{
std::random_device rd;
std::mt19937 gen(rd());
std::geometric_distribution<> d;
// same as
// std::negative_binomial_distribution<> d(1, 0.5):
std::map<int, int> hist;
for (int n = 0; n != 10000; ++n)
++hist[d(gen)];
for (auto [x, y] : hist)
{
const char c = x < 10 ? x + '0' : x - 10 + 'a';
std::cout << c << ' ' << std::string(y / 100, '*') << '\n';
}
}
Possible output:
0 ************************************************* 1 ************************* 2 ************ 3 ****** 4 ** 5 * 6 7 8 9[edit] External links
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