std::binomial_distribution
De cppreference.com
 |
This page has been machine-translated from the English version of the wiki using Google Translate.
The translation may contain errors and awkward wording. Hover over text to see the original version. You can help to fix errors and improve the translation. For instructions click here. |
<metanoindex/>
<tbody> </tbody>| Definido no cabeçalho <random>
|
||
template< class IntType = int > class binomial_distribution; |
(desde C++11) | |
Produz aleatória não negativa i valores inteiros, distribuídos de acordo com a função de probabilidade discreta:
Original:
Produces random non-negative integer values i, distributed according to discrete probability function:
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
- P(i|t,p) =⎛
⎜
⎝t
p⎞
⎟
⎠ · pi
· (1 − p)t−i
O valor obtido é o número de sucessos de uma sequência de sim / não t experiências, cada uma das quais com êxito p probabilidade.
Original:
The value obtained is the number of successes in a sequence of t yes/no experiments, each of which succeeds with probability p.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Tipos de membro
Tipo de membro
Original: Member type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Definition |
result_type
|
IntType
|
param_type
|
o tipo do conjunto de parâmetros, não especificado
Original: the type of the parameter set, unspecified The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Funções de membro
constrói nova distribuição Original: constructs new distribution The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
redefine o estado interno da distribuição Original: resets the internal state of the distribution The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
Original: Generation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | |
gera o próximo número aleatório na distribuição Original: generates the next random number in the distribution The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
Original: Characteristics The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | |
retorna o parâmetro de distribuição t (número de tentativas) Original: returns the t distribution parameter (number of trials) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
retorna o parâmetro de distribuição p (probabilidade de um true geração julgamento) Original: returns the p distribution parameter (probability of a trial generating true) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
obtém ou define o objeto de parâmetro de distribuição Original: gets or sets the distribution parameter object The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
retorna o valor mínimo potencialmente gerado Original: returns the minimum potentially generated value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
retorna o valor máximo potencialmente gerado Original: returns the maximum potentially generated value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
Não-membros funções
compara dois objetos de distribuição Original: compares two distribution objects The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função) | |
executa fluxo de entrada e saída em pseudo-aleatório distribuição de números Original: performs stream input and output on pseudo-random number distribution The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função) | |
Exemplo
trama de distribuição binomial com probabilidade de sucesso de cada ensaio exatamente 0,5, ilustrando a relação com o triângulo de Pascal (as probabilidades de que nenhum, 1, 2, 3 ou todos os quatro dos 4 ensaios serão bem sucedidos neste caso são 1:04 : 6:04:01)
Original:
plot of binomial distribution with probability of success of each trial exactly 0.5, illustrating the relationship with the pascal triangle (the probabilities that none, 1, 2, 3, or all four of the 4 trials will be successful in this case are 1:4:6:4:1)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
#include <iostream>
#include <iomanip>
#include <string>
#include <map>
#include <random>
int main()
{
std::random_device rd;
std::mt19937 gen(rd());
// perform 4 trials, each succeeds 1 in 2 times
std::binomial_distribution<> d(4, 0.5);
std::map<int, int> hist;
for(int n=0; n<10000; ++n)
++hist[d(gen)];
for(auto p : hist)
std::cout << p.first <<
' ' << std::string(p.second/100, '*') << '\n';
}
Saída:
0 ******
1 ************************
2 *************************************
3 *************************
4 ******
Links externos
Weisstein, Eric W. "Binomial Distribution." De MathWorld - Um recurso Web Wolfram.
Original:
Weisstein, Eric W. "Binomial Distribution." From MathWorld--A Wolfram Web Resource.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
