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    std::discrete_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
    inner_product
    adjacent_difference
    partial_sum
     
    Pseudo-Zufallszahlen
    Motoren und Adaptern
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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)
    lognormal_distribution(C++11)
    chi_squared_distribution(C++11)
    cauchy_distribution(C++11)
    fisher_f_distribution(C++11)
    student_t_distribution(C++11)
    Sampling-Distributionen
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    Sampling distributions
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    discrete_distribution(C++11)
    piecewise_constant_distribution(C++11)
    piecewise_linear_distribution(C++11)
    Seed-Sequenzen
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    Seed Sequences
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    seed_seq(C++11)
    C-Bibliothek
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    C library
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    rand
    srand
    RAND_MAX
     
    std::discrete_distribution
    Member-Funktionen
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    Member functions
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    discrete_distribution::discrete_distribution
    discrete_distribution::reset
    Generation
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    Generation
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    discrete_distribution::operator()
    Merkmale
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    Characteristics
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    discrete_distribution::probabilities
    discrete_distribution::param
    discrete_distribution::min
    discrete_distribution::max
    Non-Member-Funktionen
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    Non-member functions
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    operator==
    operator!=
    operator<<
    operator>>
     
    definiert in Header <random>
    template<class IntType =int>
    class discrete_distribution;
    		(seit C++11)
    std::discrete_distribution produziert Zufallsganzzahlen auf dem Intervall [0, n), wo die Wahrscheinlichkeit des einzelnen ganzzahligen i als w
    i    /S     definiert ist, die das Gewicht' der ith Integer durch die Summe aller Gewichte n unterteilt ist .
    Original:
    std::discrete_distribution produces random integers on the interval [0, n), where the probability of each individual integer i is defined as w
    i    /S    , that is the weight of the ith integer divided by the sum of all n weights.
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    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
    Original:
    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
    Original:
    Generation
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    erzeugt das nächste Zufallszahl in der Verteilung
    Original:
    generates the next random number in the distribution
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    (öffentliche Elementfunktion)[edit]
    Merkmale
    Original:
    Characteristics
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    erhält die Liste der Wahrscheinlichkeiten
    Original:
    obtains the list of probabilities
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    (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
    Original:
    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 <map>#include <random>   int main(){std::random_device rd;std::mt19937 gen(rd()); std::discrete_distribution<> d({40, 10, 10, 40});std::map<int, int> m;for(int n=0; n<10000;++n){++m[d(gen)];}for(auto p : m){std::cout<< p.first<<" generated "<< p.second<<" times\n";}}

    Output: 

    0 generated 4028 times 1 generated 978 times 2 generated 1012 times 3 generated 3982 times
    Von „https://de.cppreference.com/mwiki/index.php?title=cpp/numeric/random/discrete_distribution&oldid=27495“
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