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std::abs<div class="t-tr-text">(Std :: valarray)<div class="t-tr-dropdown"><div><div><div class="t-tr-dropdown-arrow-border"></div><div class="t-tr-dropdown-arrow"></div><div class="t-tr-dropdown-h">Original:</div><div class="t-tr-dropdown-orig">(std::valarray)</div><div class="t-tr-dropdown-notes">The text has been machine-translated via [http://translate.google.com Google Translate].<br/> You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.</div></div></div></div></div>

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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
 
 
Defined in header <valarray>
template< class T >
valarray<T> abs( const valarray<T>& va );
Berechnet absolute Wert jedes Elements in dem Wert Array .
Original:
Computes absolute value of each element in the value array.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

va -
Wert-Array, um die Operation zu verarbeiten
Original:
value array to apply the operation to
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[Bearbeiten] Rückgabewert

Wert Array mit Absolutwerten von den Werten in va .
Original:
Value array containing absolute values of the values in va.
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[Bearbeiten] Notes

Unqualifizierte Funktion (abs) verwendet wird, um die Berechnung auszuführen. Wenn diese Funktion nicht verfügbar ist, wird std::abs verwendet wird wegen Argument abhängig Lookup .
Original:
Unqualified function (abs) is used to perform the computation. If such function is not available, std::abs is used due to argument dependent lookup.
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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] Mögliche Implementierung

template< class T >
valarray<T> abs( const valarray<T>& va )
{
    valarray<T> other = va;
    for (T &i : other) {
        i = abs(i);
    }
    return other; // proxy object may be returned
}

[Bearbeiten] Beispiel

#include <valarray>
#include <iostream>
 
int main()
{
    std::valarray<int> v{1, -2, 3, -4, 5, -6, 7, -8};
    std::valarray<int> v2 = std::abs(v);
    for(auto n : v2) {
        std::cout << n << ' ';
    }
    std::cout << '\n';
}

Output:

1 2 3 4 5 6 7 8

[Bearbeiten] Siehe auch

berechnet Absolutwert eines Integralwerts (|x|)
Original:
computes absolute value of an integral value (|x|)
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(Funktion)
Absolutwert einer Fließkommazahl (|x|)
Original:
absolute value of a floating point value (|x|)
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(Funktion)
liefert den Betrag einer komplexen Zahl
Original:
returns the magnitude of a complex number
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(Funktions-Template) [edit]