std::lognormal_distribution

 

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Pseudo-casuale generazione

In fase di compilazione aritmetica razionale(C++11)

Generici operazioni numeriche Original: Generic numeric operations 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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Pseudo-casuale generazione

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random_device (C++11)

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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uniform_int_distribution (C++11)

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bernoulli_distribution (C++11)

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normal_distribution (C++11)

lognormal_distribution (C++11)

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rand

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std::lognormal_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.

lognormal_distribution::lognormal_distribution

lognormal_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.

lognormal_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.

lognormal_distribution::param

lognormal_distribution::min

lognormal_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 RealType =double> class lognormal_distribution;		(dal C++11)

Il numero casuale distribuzione lognormal_distribution produce numeri casuali x > 0 secondo una distribuzione log-normale:

Original:

The lognormal_distribution random number distribution produces random numbers x > 0 according to a log-normal distribution:

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f(x; m,s) = None

1

sx√2 π

exp⎛
⎜
⎝- None

(ln x - m)2

2s2

⎞
⎟
⎠

Il m parametro è la media e il parametro s la deviazione standard.

Original:

The parameter m is the mean and the parameter s the standard deviation.

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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	RealType
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.
m	restituisce l'(m) parametro di distribuzione media Original: returns the mean (m) distribution parameter The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)
s	restituisce la deviazione standard (s) parametro di distribuzione Original: returns the standard deviation (s) distribution parameter 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

#include <iostream>#include <iomanip>#include <string>#include <map>#include <random>#include <cmath>int main(){ std::random_device rd;std::mt19937 gen(rd());   std::lognormal_distribution<> d(1.6, 0.25);   std::map<int, int> hist;for(int n=0; n<10000;++n){++hist[std::round(d(gen))];}for(auto p : hist){std::cout<<std::fixed<<std::setprecision(1)<<std::setw(2)<< p.first<<' '<<std::string(p.second/200, '*')<<'\n';}}

Output:

2 3 *** 4 ************* 5 *************** 6 ********* 7 **** 8 * 9 10 11 12

Collegamenti esterni

• Weisstein, Eric W. "Log Normal Distribution." Da MathWorld - Una risorsa Web Wolfram.

  Original:

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

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• Log-normal distribution. Da Wikipedia.

  Original:

  Log-normal distribution. From Wikipedia.

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