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std::log<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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Definido en el archivo de encabezado `<valarray>`
`template< class T > valarray<T> log( const valarray<T>& va );`

Para cada elemento de va calcula el logaritmo natural del valor de la elemento .

Original:

For each element in va computes natural logarithm of the value of the element.

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Parámetros

va

-

matriz de valores para aplicar la operación a

Original:

value array to apply the operation to

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Valor de retorno

matriz de valores logaritmos naturales de los valores en va .

Original:

Value array natural logarithms of the values in va.

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Notas

Función Cualificado (log) se utiliza para realizar el cálculo. Si tal función no está disponible, std::log se utiliza debido a búsqueda argumento dependiente .

Original:

Unqualified function (log) is used to perform the computation. If such function is not available, std::log is used due to argument dependent lookup.

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La función se puede implementar con el tipo de retorno diferente de std::valarray. En este caso, el tipo de reemplazo tiene las siguientes propiedades:

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 las funciones miembro de const std::valarray se proporcionan .
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 y puede ser construida a partir del tipo de reemplazo .
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 las funciones que aceptan un argumento de tipo const std::valarray& también deben aceptar el tipo de reemplazo .
Original:
All functions accepting a arguments of type const std::valarray& should also accept the replacement type.
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Todas las funciones que aceptan dos argumentos de tipo const std::valarray& debe aceptar todas las combinaciones de const std::valarray& y el tipo de reemplazo .
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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Posible implementación

template< class T >
valarray<T> log( const valarray<T>& va )
{
    valarray<T> other = va;
    for (T &i : other) {
        i = log(i);
    }
}

Ejemplo