Espaços nominais
Variantes
Acções

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

 
 
Biblioteca numéricos
Funções matemáticas comuns
De ponto flutuante ambiente
Números complexos
Matrizes numéricas
Pseudo-aleatório de geração de números
Tempo de compilação aritmética racional (C++11)
Genéricos operações numéricas
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 );
Calcula o valor absoluto de cada elemento da matriz de valor.
Original:
Computes absolute value of each element in the value array.
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Índice

[editar] Parâmetros

va -
matriz de valor para aplicar a operação a
Original:
value array to apply the operation to
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[editar] Valor de retorno

Matriz de valor contendo valores absolutos dos valores em va.
Original:
Value array containing absolute values of the values in va.
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[editar] Notas

Qualificado de função (abs) é usado para executar o cálculo. Se essa função não estiver disponível, std::abs é utilizado devido ao argumento de pesquisa dependente.
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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A função pode ser implementada com o tipo de retorno diferente de std::valarray. Neste caso, o tipo de substituição tem as seguintes propriedades:
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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  • Todas as funções const membros std::valarray são fornecidos.
    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 std::indirect_array e pode ser construído a partir do tipo de reposição.
    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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  • Todas as funções de aceitar um argumentos de const std::valarray& tipo devem também aceitar o tipo de substituição.
    Original:
    All functions accepting a arguments of type const std::valarray& should also accept the replacement type.
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  • Todas as funções que aceitam dois argumentos do tipo const std::valarray& deve aceitar todas as combinações de const std::valarray& e do tipo de substituição.
    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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[editar] Possível implementação

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
}

[editar] Exemplo

#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

[editar] Veja também

calcula o valor absoluto de um valor integral (|x|)
Original:
computes absolute value of an integral value (|x|)
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(função)
valor absoluto de um valor de ponto flutuante (|x|)
Original:
absolute value of a floating point value (|x|)
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(função)
retorna a magnitude de um número complexo
Original:
returns the magnitude of a complex number
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(modelo de função) [edit]