std::valarray::apply

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

iota (C++11)

accumulate

inner_product

adjacent_difference

partial_sum

 

std::valarray

Membri funzioni Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
valarray::valarray valarray::~valarray valarray::operator= valarray::operator[] valarray::swap valarray::size valarray::resize valarray::sum valarray::min valarray::max valarray::shift valarray::cshift valarray::apply	valarray::operator+ valarray::operator- valarray::operator~ valarray::operator! valarray::operator+= valarray::operator-= valarray::operator*= valarray::operator/= valarray::operator%= valarray::operator&= valarray::operator|= valarray::operator^= valarray::operator<<= valarray::operator>>=
Non membri funzioni Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
swap (C++11) begin (C++11) end (C++11) abs exp log log10 pow sqrt sin cos tan asin acos atan atan2 sinh cosh tanh	operator* operator/ operator% operator+ operator- operator^ None operator& operator| operator<< operator>> operator&& operator None operator== operator!= operator< operator> operator<= operator>=
Helper classi Original: Helper classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
slice_array gslice_array indirect_array	slice gslice mask_array

 

valarray<T> apply( T func(T))const;
valarray<T> apply( T func(const T&))const;

Restituisce una nuova valarray della stessa dimensione, con valori che vengono acquisiti applicando func funzione ai valori precedenti degli elementi.

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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Parametri

func

-

funzione da applicare ai valori Original: function to apply to the values The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valore di ritorno

Il valarray risultante con i valori acquisiti applicando func funzione.

Original:

The resulting valarray with values acquired by applying function func.

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Note

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 conststd::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_arraystd::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 conststd::valarray& tipo devono anche accettare il tipo di sostituzione.

  Original:

  All functions accepting a arguments of type conststd::valarray& should also accept the replacement type.

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• Tutte le funzioni che accettano due argomenti di tipo conststd::valarray& dovrebbe accettare ogni combinazione di conststd::valarray& e il tipo di sostituzione.

  Original:

  All functions accepting two arguments of type conststd::valarray& should accept every combination of conststd::valarray& and the replacement type.

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Esempio

calcola e stampa i primi 10 fattoriali

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{returnstd::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

Vedi anche

for_each	applica una funzione ad una serie di elementi Original: applies a function to a range of elements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione di modello)