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    std::piecewise_linear_distribution

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    std::piecewise_linear_distribution
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    piecewise_linear_distribution::operator()
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    piecewise_linear_distribution::param
    piecewise_linear_distribution::min
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    definiert in Header <random>
    template<class RealType =double>
    class piecewise_linear_distribution;
    		(seit C++11)

    std::piecewise_linear_distribution produces random floating-point numbers, which are distributed according to a linear probability density function within each of the several subintervals [b
    i    , b
    i+1    )    . The distribution is such that the probability density at each interval boundary is exactly the predefined value p
    i    .

    The probability density for any b
    i    ≤x<b
    i+1     is p
    i
    b
    i+1    -x
    b
    i+1    -b
    i
     + p
    i+1
    x-b
    i
    b
    i+1    -b
    i
    , where probability densities at interval boundaries p
    k     are calculated as w
    k    /S     where S is the sum of all None
    1
    2
    (w
    k    +w
    k+1    )(b
    k+1    −b
    k    )    .

    The set of interval boundaries b
    i     and the set of weights at boundaries w
    i     are the parameters of this distribution.

    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
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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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    erhält die Liste der Intervallgrenzen
    Original:
    obtains the list of interval boundaries
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    (öffentliche Elementfunktion)[edit]
    erhält die Liste der Wahrscheinlichkeitsdichten bei Intervallgrenzen
    Original:
    obtains the list of probability densities at interval boundaries
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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
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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
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    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());// increase the probability from 0 to 5// remain flat from 5 to 10// decrease from 10 to 15 at the same ratestd::vector<double> i{0, 5, 10, 15};std::vector<double> w{0, 1, 1, 0}; std::piecewise_linear_distribution<> d(i.begin(), i.end(), w.begin());   std::map<int, int> hist;for(int n=0; n<10000;++n){++hist[d(gen)];}for(auto p : hist){std::cout<<std::setw(2)<< p.first<<' '<<std::string(p.second/100, }}

    Output: 

    0 * 1 *** 2 **** 3 ****** 4 ********* 5 ********* 6 ********* 7 ********** 8 ********* 9 ********** 10 ********* 11 ******* 12 **** 13 *** 14 *
    Von „https://de.cppreference.com/mwiki/index.php?title=cpp/numeric/random/piecewise_linear_distribution&oldid=27614“
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