std::valarray
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| Elemento definito nell'header <valarray>
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| template< class T > class valarray; |
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std::valarray è la classe per la rappresentazione e la manipolazione di array di valori. Supporta operazioni matematiche elemento-saggi e varie forme di generalizzate operatori pedice, affettare e accesso indiretto.
Original:
std::valarray is the class for representing and manipulating arrays of values. It supports element-wise mathematical operations and various forms of generalized subscript operators, slicing and indirect access.
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[modifica] Note
Classi helper std::valarray e sono definiti per essere liberi di certe forme di aliasing, consentendo in tal modo le operazioni su queste classi di ottimizzare simile all'effetto della parola chiave
restrict nel linguaggio di programmazione C. Inoltre, le funzioni e gli operatori che accettano argomenti valarray sono permesso di tornare oggetti proxy per rendere possibile per il compilatore di ottimizzare espressioni quali v1 = a*v2 + v3; come un ciclo unico che esegue v1[i] = a*v2[i] + v3[i]; evitando provvisori o più passaggi. Tuttavia, espressione modelli fare la stessa tecnica di ottimizzazione disponibili per qualsiasi contenitore C + +, e la maggior parte delle librerie di modelli numerici preferiscono espressione di valarrays di flessibilità. Alcune implementazioni della libreria C + + standard, utilizzare i modelli di espressione per implementare operazioni efficienti sul std::valarray (ad esempio GNU libstdc + + e LLVM libc + +), e solo raramente valarrays sono ottimizzati ulteriormente, ad esempio, in Intel Parallel Studio.Original:
std::valarray and helper classes are defined to be free of certain forms of aliasing, thus allowing operations on these classes to be optimized similar to the effect of the keyword
restrict in the C programming language. In addition, functions and operators that take valarray arguments are allowed to return proxy objects to make it possible for the compiler to optimize an expression such as v1 = a*v2 + v3; as a single loop that executes v1[i] = a*v2[i] + v3[i]; avoiding any temporaries or multiple passes. However, espressione modelli make the same optimization technique available for any C++ container, and the majority of numeric libraries prefer expression templates to valarrays for flexibility. Some C++ standard library implementations use expression templates to implement efficient operations on std::valarray (e.g. GNU libstdc++ and LLVM libc++), and only rarely valarrays are optimized any further, e.g. in Intel Parallel Studio.The text has been machine-translated via Google Translate.
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[modifica] Membri tipi
| Membro tipo
Original: Member type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Definition |
value_type
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T
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[modifica] Membri funzioni
| costruisce nuova matrice numerica Original: constructs new numeric array The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
| distrugge la matrice numerica Original: destructs the numeric array The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
| assegna il contenuto Original: assigns the contents The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
| get / set elemento valarray, fetta, o maschera Original: get/set valarray element, slice, or mask The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
| applica un operatore unario aritmetica per ogni elemento del valarray Original: applies a unary arithmetic operator to each element of the valarray The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
| vale assegnazione operatore composto ad ogni elemento della valarray Original: applies compound assignment operator to each element of the valarray The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
| swap con un'altra valarray Original: swaps with another valarray The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
| restituisce la dimensione di valarray Original: returns the size of valarray The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
| cambia le dimensioni del valarray Original: changes the size of valarray The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
| calcola la somma di tutti gli elementi Original: calculates the sum of all elements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
| restituisce l'elemento più piccolo Original: returns the smallest element The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
| restituisce l'elemento più grande Original: returns the largest element The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
| zero-riempimento spostare gli elementi del valarray Original: zero-filling shift the elements of the valarray The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
| shift circolare degli elementi del valarray Original: circular shift of the elements of the valarray The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
| applies a function to every element of a valarray (metodo pubblico) | |
[modifica] Non membri funzioni
| (C++11) |
specializzata l'algoritmo std::swap() Original: specializes the std::swap() algorithm 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) |
| (C++11) |
specializzata std::begin Original: specializes std::begin 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) |
| (C++11) |
specializzata std::end Original: specializes std::end 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) |
| vale operatori binari a ciascun elemento di due valarrays, o un valarray e un valore Original: applies binary operators to each element of two valarrays, or a valarray and a value 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) | |
| confronta due valarrays o un valarray con un valore Original: compares two valarrays or a valarray with a value 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) | |
| applica la std::abs funzione a ogni elemento di valarray Original: applies the function std::abs to each element of valarray 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) | |
Original: Exponential functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | |
| applica la std::exp funzione a ogni elemento di valarray Original: applies the function std::exp to each element of valarray 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) | |
| applica la std::log funzione a ogni elemento di valarray Original: applies the function std::log to each element of valarray 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) | |
| applica la std::log10 funzione a ogni elemento di valarray Original: applies the function std::log10 to each element of valarray 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) | |
Original: Power functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | |
| applica la std::pow funzione a due valarrays o un valarray e un valore Original: applies the function std::pow to two valarrays or a valarray and a value 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) | |
| applica la std::sqrt funzione a ogni elemento di valarray Original: applies the function std::sqrt to each element of valarray 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) | |
Original: Trigonometric functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | |
| applica la std::sin funzione a ogni elemento di valarray Original: applies the function std::sin to each element of valarray 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) | |
| applica la std::cos funzione a ogni elemento di valarray Original: applies the function std::cos to each element of valarray 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) | |
| applica la std::tan funzione a ogni elemento di valarray Original: applies the function std::tan to each element of valarray 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) | |
| applica la std::asin funzione a ogni elemento di valarray Original: applies the function std::asin to each element of valarray 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) | |
| applica la std::acos funzione a ogni elemento di valarray Original: applies the function std::acos to each element of valarray 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) | |
| applica la std::atan funzione a ogni elemento di valarray Original: applies the function std::atan to each element of valarray 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) | |
| applica la funzione di un std::atan2 valarray e un valore Original: applies the function std::atan2 to a valarray and a value 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) | |
Original: Hyperbolic functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | |
| applica la std::sinh funzione a ogni elemento di valarray Original: applies the function std::sinh to each element of valarray 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) | |
| applica la std::cosh funzione a ogni elemento di valarray Original: applies the function std::cosh to each element of valarray 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) | |
| applica la std::tanh funzione a ogni elemento di valarray Original: applies the function std::tanh to each element of valarray 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) | |
[modifica] Helper classi
| BLAS-come una fetta di valarray: indice iniziale, lunghezza, passo Original: BLAS-like slice of a valarray: starting index, length, stride The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe) | |
| proxy per un sottoinsieme di un valarray dopo l'applicazione di una fetta Original: proxy to a subset of a valarray after applying a slice The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe template) | |
| fetta generalizzata di un valarray: indice iniziale, set di lunghezze, serie di passi Original: generalized slice of a valarray: starting index, set of lengths, set of strides The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe) | |
| proxy per un sottoinsieme di un valarray dopo aver applicato un gslice Original: proxy to a subset of a valarray after applying a gslice The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe template) | |
| proxy per un sottoinsieme di un valarray dopo l'applicazione di un operatore booleano maschera [] Original: proxy to a subset of a valarray after applying a boolean mask operator[] The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe template) | |
| proxy per un sottoinsieme di un valarray dopo l'applicazione dell'operatore indiretta [] Original: proxy to a subset of a valarray after applying indirect operator[] The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe template) | |
