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    std::poisson_distribution

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    C++
     
    Numerik-Bibliothek
    Gemeinsame mathematischen Funktionen
    Floating-Point-Umgebung
    Komplexe Zahlen
    Numerische Arrays
    Pseudo-Zufallszahlen
    Compile-time rationale Arithmetik(C++11)
    Generische numerische Operationen
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    Generic numeric operations
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    iota(C++11)
    accumulate
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    Pseudo-Zufallszahlen
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    Engines and engine adaptors
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    linear_congruential_engine(C++11)
    mersenne_twister_engine(C++11)
    subtract_with_carry_engine(C++11)
    discard_block_engine(C++11)
    independent_bits_engine(C++11)
    shuffle_order_engine(C++11)
    Generatoren
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    Generators
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    random_device(C++11)
    Ausschüttungen
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    Distributions
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    Uniform-Distributionen
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    Uniform distributions
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    uniform_int_distribution(C++11)
    uniform_real_distribution(C++11)
    generate_canonical(C++11)
    Bernoulli-Distributionen
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    Bernoulli distributions
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    bernoulli_distribution(C++11)
    binomial_distribution(C++11)
    negative_binomial_distribution(C++11)
    geometric_distribution(C++11)
    Poisson-Verteilungen
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    Poisson distributions
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    poisson_distribution(C++11)
    exponential_distribution(C++11)
    gamma_distribution(C++11)
    weibull_distribution(C++11)
    extreme_value_distribution(C++11)
    Normalverteilungen
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    Normal distributions
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    normal_distribution(C++11)
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    chi_squared_distribution(C++11)
    cauchy_distribution(C++11)
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    rand
    srand
    RAND_MAX
     
    std::poisson_distribution
    Member-Funktionen
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    Member functions
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    poisson_distribution::poisson_distribution
    poisson_distribution::reset
    Generation
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    Generation
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    poisson_distribution::operator()
    Merkmale
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    Characteristics
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    poisson_distribution::mean
    poisson_distribution::param
    poisson_distribution::min
    poisson_distribution::max
    Non-Member-Funktionen
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    Non-member functions
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    operator==
    operator!=
    operator<<
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    definiert in Header <random>
    template<class IntType =int>
    class poisson_distribution;
    		(seit C++11)
    Erzeugt zufällige nicht-negative ganzzahlige Werte i, verteilt nach diskreten Wahrscheinlichkeitsfunktion:
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    Produces random non-negative integer values i, distributed according to discrete probability function:
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    P(i|μ) =
    e-μ
    ·μi
    i!

    The value obtained is the probability of exactly i occurrences of a random event if the expected, mean number of its occurrence under the same conditions (on the same time/space interval) is μ.

    Inhaltsverzeichnis

    [Bearbeiten]Mitglied Typen

    Mitglied Typ
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    Member type
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    		 Definition
    result_typeIntType
    param_type
    die Art des Parametersatzes, nicht näher bezeichnet
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    the type of the parameter set, unspecified
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    [Bearbeiten]Member-Funktionen

    		 erzeugt eine neue Verteilung
    (öffentliche Elementfunktion)[edit]
    setzt den internen Zustand der Verteilung
    Original:
    resets the internal state of the distribution
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    (öffentliche Elementfunktion)[edit]
    Generation
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    Generation
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    erzeugt das nächste Zufallszahl in der Verteilung
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    generates the next random number in the distribution
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    (öffentliche Elementfunktion)[edit]
    Merkmale
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    Characteristics
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    		 returns the mean distribution parameter (mean number of occurrences of the event)
    (öffentliche Elementfunktion)[edit]
    ab oder legt die Verteilung Parameter-Objekt
    Original:
    gets or sets the distribution parameter object
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    (öffentliche Elementfunktion)[edit]
    gibt das Minimum potentiell generierten Wert
    Original:
    returns the minimum potentially generated value
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    (öffentliche Elementfunktion)[edit]
    gibt die maximale potentiell generierten Wert
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    returns the maximum potentially generated value
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    (öffentliche Elementfunktion)[edit]

    [Bearbeiten]Non-Member-Funktionen

    vergleicht zwei Verteilung Objekte
    Original:
    compares two distribution objects
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    (Funktion)[edit]
    Stream führt Eingabe und Ausgabe auf Pseudozufallszahl Verteilung
    Original:
    performs stream input and output on pseudo-random number distribution
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    (Funktion)[edit]

    [Bearbeiten]Beispiel

    #include <iostream>#include <iomanip>#include <string>#include <map>#include <random>int main(){std::random_device rd;std::mt19937 gen(rd());   // if an event occurs 4 times a minute on average// how often is it that it occurs n times in one minute? std::poisson_distribution<> d(4);   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 12 13

    [Bearbeiten]Externer Links

    Weisstein, Eric W. "Poisson Distribution." Von MathWorld - A Wolfram Web Resource .
    Original:
    Weisstein, Eric W. "Poisson Distribution." From MathWorld--A Wolfram Web Resource.
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    Von „https://de.cppreference.com/mwiki/index.php?title=cpp/numeric/random/poisson_distribution&oldid=27621“
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