public member function
<random>
| (1) | explicit binomial_distribution ( result_type t = 1, double p = 0.5 ); |
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| (2) | explicit binomial_distribution ( const param_type& parm ); |
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Construct binomial distribution
Constructs a binomial_distribution object, adopting the distribution parameters specified either by t and p or by object parm.
Parameters
- t
- The upper bound of the range ([0,t]) of possible values the distribution can generate.
This represents the number of independent Bernoulli-distributed experiments each generated value is said to simulate.
result_type is a member type that represents the type of the random numbers generated on each call to operator(). It is defined as an alias of the first class template parameter (IntType).
- p
- Probability of success.
This represents the probability of success on each of the independent Bernoulli-distributed experiments each generated value is said to simulate.
This shall be a value between 0.0 and 1.0 (both included).
- parm
- An object representing the distribution's parameters, obtained by a call to member function param.
param_type is a member type.
Example
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// binomial_distribution example
#include <iostream>
#include <chrono>
#include <random>
int main()
{
// construct a trivial random generator engine from a time-based seed:
unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
std::default_random_engine generator (seed);
std::binomial_distribution<int> distribution (10,0.5);
std::cout << "some binomial results (t=10,p=0.5): ";
for (int i=0; i<10; ++i)
std::cout << distribution(generator) << " ";
std::cout << std::endl;
return 0;
}
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Possible output:
some binomial results (t=10,p=0.5): 5 5 4 5 4 5 6 4 5 4
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