std::bernoulli_distribution
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bernoulli_distribution
(C++11)
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std::bernoulli_distribution
Member functions
Generation
Characteristics
Non-member functions
(C++11)(C++11)(until C++20)
(C++11)(C++11)
Defined in header
<random>
class bernoulli_distribution;
(since C++11)
Produces random boolean values, according to the discrete probability function. The probability of true is
- P(b|p) =⎧
⎨
⎩p, if b is true
1 − p, if b is false
std::bernoulli_distribution satisfies RandomNumberDistribution.
Contents
[edit] Member types
Member type
Definition
result_type (C++11)
bool
[edit] Member functions
Generation
Characteristics
(C++11)
(public member function) [edit]
[edit] Non-member functions
(C++11)
(function template) [edit]
[edit] Example
Run this code
#include <iomanip> #include <iostream> #include <map> #include <random> #include <string> int main() { std::random_device rd; std::mt19937 gen(rd()); // give "true" 1/4 of the time // give "false" 3/4 of the time std::bernoulli_distribution d(0.25); std::map <bool, int> hist; for (int n = 0; n < 10000; ++n) ++hist[d(gen)]; std::cout << std::boolalpha ; for (auto const& [key, value] : hist) std::cout << std::setw (5) << key << ' ' << std::string (value / 500, '*') << '\n'; }
Possible output:
false *************** true ****
[edit] External links
Weisstein, Eric W. "Bernoulli Distribution." From MathWorld — A Wolfram Web Resource.