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std::valarray::apply

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< cpp‎ | numeric‎ | valarray

 
 
Numerik-Bibliothek
Gemeinsame mathematischen Funktionen
Floating-Point-Umgebung
Komplexe Zahlen
Numerische Arrays
Pseudo-Zufallszahlen
Compile-time rationale Arithmetik (C++11)
Generische numerische Operationen
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
std::valarray
Member-Funktionen
Original:
Member functions
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Non-Member-Funktionen
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Non-member functions
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Helper-Klassen
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Helper classes
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valarray<T> apply( T func(T) ) const;
valarray<T> apply( T func(const T&) ) const;
Gibt ein neues valarray gleicher Größe mit den Werten, die durch Anwendung der Funktion func zu den vorherigen Werten der Elemente erfasst werden .
Original:
Returns a new valarray of the same size with values which are acquired by applying function func to the previous values of the elements.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

func -
Funktion, um die Werte zu übernehmen
Original:
function to apply to the values
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[Bearbeiten] Rückgabewert

Die daraus resultierende valarray mit Werten, indem Funktion func erworben .
Original:
The resulting valarray with values acquired by applying function func.
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[Bearbeiten] Notes

Die Funktion kann mit dem Rückgabetyp anders std::valarray umgesetzt werden. In diesem Fall weist die Ersetzungsart die folgenden Eigenschaften:
Original:
The function can be implemented with the return type different from std::valarray. In this case, the replacement type has the following properties:
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  • Alle const Elementfunktionen std::valarray bereitgestellt werden .
    Original:
    All const member functions of std::valarray are provided.
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  • std::valarray, std::slice_array, std::gslice_array, std::mask_array und std::indirect_array kann aus dem Ersatz-Typ gebaut werden .
    Original:
    std::valarray, std::slice_array, std::gslice_array, std::mask_array and std::indirect_array can be constructed from the replacement type.
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  • Alle Funktionen Annehmen eines Argumente des Typs const std::valarray& sollten auch akzeptieren, den Austausch Typ .
    Original:
    All functions accepting a arguments of type const std::valarray& should also accept the replacement type.
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  • Alle Funktionen mit zwei Parametern vom Typ const std::valarray& sollten akzeptieren, jede Kombination von const std::valarray& und den Ersatz Typ .
    Original:
    All functions accepting two arguments of type const std::valarray& should accept every combination of const std::valarray& and the replacement type.
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[Bearbeiten] Beispiel

berechnet und druckt die ersten 10 Fakultäten
Original:
calculates and prints the first 10 factorials
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#include <iostream>
#include <valarray>
#include <cmath>
 
int main()
{
    std::valarray<int> v = {1,2,3,4,5,6,7,8,9,10};
    v = v.apply([](int n)->int {
                    return std::round(std::tgamma(n+1));
                });
    for(auto n : v) {
        std::cout << n << ' ';
    }
    std::cout << '\n';
}

Output:

1 2 6 24 120 720 5040 40320 362880 3628800

[Bearbeiten] Siehe auch

gilt eine Funktion einer Reihe von Elementen
Original:
applies a function to a range of elements
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(Funktions-Template) [edit]