Namespace
Varianti

std::exp<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>

Da cppreference.com.
< cpp‎ | numeric‎ | valarray

 
 
Numeri libreria
Comuni funzioni matematiche
Virgola mobile ambiente
I numeri complessi
Array numerici
Pseudo-casuale generazione
In fase di compilazione aritmetica razionale (C++11)
Generici operazioni numeriche
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> exp( const valarray<T>& va );
Per ogni elemento in va calcola e elevata alla potenza pari al valore dell'elemento.
Original:
For each element in va computes e raised to the power equal to the value of the element.
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Indice

[modifica] Parametri

va -
matrice valore per applicare l'operazione
Original:
value array to apply the operation to
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[modifica] Valore di ritorno

Valore matrice contenente e sollevata dai valori in va.
Original:
Value array containing e raised by the values in va.
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[modifica] Note

Funzione non qualificato (exp) viene utilizzato per eseguire il calcolo. Se tale funzione non è disponibile, std::exp viene utilizzato a causa di ricerca tesi a carico.
Original:
Unqualified function (exp) is used to perform the computation. If such function is not available, std::exp is used due to argument dependent lookup.
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La funzione può essere implementata con il tipo restituito diverso da std::valarray. In questo caso, il tipo di sostituzione ha le seguenti proprietà:
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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  • Tutte le funzioni di membro const std::valarray sono forniti.
    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 può essere costruito con il tipo di sostituzione.
    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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  • Tutte le funzioni che accettano un argomento di const std::valarray& tipo devono anche accettare il tipo di sostituzione.
    Original:
    All functions accepting a arguments of type const std::valarray& should also accept the replacement type.
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  • Tutte le funzioni che accettano due argomenti di tipo const std::valarray& dovrebbe accettare ogni combinazione di const std::valarray& e il tipo di sostituzione.
    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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[modifica] Possibile implementazione

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

[modifica] Esempio

Questo esempio dimostra e
= -1
l'identità di Eulero e gli esponenti relativi .
Original:
This example demonstrates the Euler's identity e
= -1
and the related exponents.
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#include <iostream>
#include <complex>
#include <valarray>
 
int main()
{
    const double pi = std::acos(-1);
    std::valarray<std::complex<double>> v = {
        {0, 0}, {0, pi/2}, {0, pi}, {0, 3*pi/2}, {0, 2*pi}
    };
    std::valarray<std::complex<double>> v2 = std::exp(v);
    for(auto n : v2) {
        std::cout << std::fixed << n << '\n';
    }
}

Output:

(1.000000,0.000000)
(0.000000,1.000000)
(-1.000000,0.000000)
(-0.000000,-1.000000)
(1.000000,-0.000000)

[modifica] Vedi anche

ritorna e elevato alla potenza data (ex)
Original:
returns e raised to the given power (ex)
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(funzione) [edit]
complex base e exponential
(funzione di modello) [edit]