std::geometric_distribution

 

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Pseudo-casuale generazione

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Distribuzioni Original: Distributions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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bernoulli_distribution (C++11)

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geometric_distribution (C++11)

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std::geometric_distribution

Membri funzioni Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

geometric_distribution::geometric_distribution

geometric_distribution::reset

Generazione Original: Generation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

geometric_distribution::operator()

Caratteristiche Original: Characteristics The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

geometric_distribution::p

geometric_distribution::param

geometric_distribution::min

geometric_distribution::max

Non membri funzioni Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

operator== operator!=

operator<< operator>>

 

Elemento definito nell'header <random>
template<class IntType =int> class geometric_distribution;		(dal C++11)

Produce casuale non negativo i valori interi, distribuito in base alla funzione di probabilità discrete:

Original:

Produces random non-negative integer values i, distributed according to discrete probability function:

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P(i|p) = p · (1 − p)i

Il valore rappresenta il numero di sì / no prove (ogni successo con p probabilità) che sono necessari per ottenere un singolo successo.

Original:

The value represents the number of yes/no trials (each succeeding with probability p) which are necessary to obtain a single success.

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std::geometric_distribution<>(p) è esattamente equivalente a std::negative_binomial_distribution<>(1, p). E 'anche la controparte discreta di std::exponential_distribution.

Original:

std::geometric_distribution<>(p) is exactly equivalent to std::negative_binomial_distribution<>(1, p). It is also the discrete counterpart of std::exponential_distribution.

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Membri tipi

Membro tipo 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	il tipo di set di parametri, non specificato 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.

Membri funzioni

(costruttore)	costruisce nuova distribuzione 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. (metodo pubblico)
reset	ripristina lo stato interno della distribuzione 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. (metodo pubblico)
Generazione Original: Generation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
operator()	genera il successivo numero casuale nella distribuzione 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. (metodo pubblico)
Caratteristiche Original: Characteristics The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
p	restituisce la distribuzione p parametro (probabilità di un true generatrice di prova) 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. (metodo pubblico)
param	ottiene o imposta l'oggetto parametro di distribuzione 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. (metodo pubblico)
min	restituisce il valore minimo potenzialmente generato 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. (metodo pubblico)
max	restituisce il valore massimo potenzialmente generato 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. (metodo pubblico)

Non membri funzioni

operator== operator!=	confronta due oggetti di distribuzione 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. (funzione)
operator<< operator>>	esegue flusso di ingresso e di uscita sul pseudo-casuale distribuzione numerica 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. (funzione)

Esempio

geometric_distribution <> (0.5) è il default e rappresenta il numero di lanci di moneta che sono necessari per ottenere le teste

Original:

geometric_distribution<>(0.5) is the default and represents the number of coin tosses that are required to get heads

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#include <iostream>#include <iomanip>#include <string>#include <map>#include <random>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 p : hist){std::cout<< p.first<<' '<<std::string(p.second/100, '*')<<'\n';}}

Output:

0 ************************************************* 1 ************************* 2 ************ 3 ****** 4 ** 5 * 6 7 8 9 10 11

Collegamenti esterni

Weisstein, Eric W. "Geometric Distribution." Da MathWorld - Una risorsa Web Wolfram.

Original:

Weisstein, Eric W. "Geometric Distribution." From MathWorld--A Wolfram Web Resource.

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