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    std::normal_distribution

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    C++
     
    Numerik-Bibliothek
    Gemeinsame mathematischen Funktionen
    Floating-Point-Umgebung
    Komplexe Zahlen
    Numerische Arrays
    Pseudo-Zufallszahlen
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    Normalverteilungen
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    std::normal_distribution
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    normal_distribution::normal_distribution
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    normal_distribution::operator()
    Merkmale
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    normal_distribution::mean
    normal_distribution::stddev
    normal_distribution::param
    normal_distribution::min
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    definiert in Header <random>
    template<class RealType =double>
    class normal_distribution;
    		(seit C++11)

    Normal (oder Guassian) Zufallszahl Verteilung:

    f(x; μ,σ) = None
    1
    σ√2π
     exp⎛
    ⎜
    ⎝    -
    1
    2
    ⎛
    ⎜
    ⎝
    x-μ
    σ
    ⎞
    ⎟
    ⎠    2
    ⎞
    ⎟
    ⎠
    Mit dem bedeutenμ und die Standardabweichung ( stddev) σ .
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    With the bedeutenμ and the Standardabweichung (stddev) σ.
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    Inhaltsverzeichnis

    [Bearbeiten]Mitglied Typen

    Mitglied Typ
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    Member type
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    		 Definition
    result_typeRealType
    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
    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
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    Characteristics
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    gibt den Mittelwert (μ) Verteilung Parameter
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    returns the mean (μ) distribution parameter
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    (öffentliche Elementfunktion)[edit]
    gibt die Standardabweichung (σ) Verteilung Parameter
    Original:
    returns the standard deviation (σ) distribution parameter
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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 <iomanip>#include <string>#include <map>#include <random>#include <cmath>int main(){std::random_device rd;std::mt19937 gen(rd());   // values near the mean are the most likely// standard deviation affects the dispersion of generated values from the mean std::normal_distribution<> d(5,2);   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 -1 0 1 * 2 *** 3 ****** 4 ******** 5 ********** 6 ******** 7 ***** 8 *** 9 * 10 11 12

    [Bearbeiten]Externer Links

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