std::bernoulli_distribution
From cppreference.com
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 |
param_type(C++11) | the type of the parameter set, see RandomNumberDistribution. |
[edit]Member functions
(C++11) | constructs new distribution (public member function) |
(C++11) | resets the internal state of the distribution (public member function) |
Generation | |
(C++11) | generates the next random number in the distribution (public member function) |
Characteristics | |
(C++11) | returns the p distribution parameter (probability of generating true) (public member function) |
(C++11) | gets or sets the distribution parameter object (public member function) |
(C++11) | returns the minimum potentially generated value (public member function) |
(C++11) | returns the maximum potentially generated value (public member function) |
[edit]Non-member functions
(C++11)(C++11)(removed in C++20) | compares two distribution objects (function) |
(C++11) | performs stream input and output on pseudo-random number distribution (function template) |
[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(autoconst&[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. |
