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std::valarray

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< cpp‎ | numeric

 
 
Bibliothèque Numerics
Fonctions mathématiques courantes
Virgule flottante environnement
Nombres complexes
Tableaux numériques
La génération de nombres pseudo-aléatoires
Moment de la compilation arithmétique rationnelle (C++11)
Génériques des opérations numériques
Original:
Generic numeric operations
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iota (C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
std::valarray
 
Defined in header <valarray>
template< class T >
class valarray;
std::valarray est la classe pour représenter et manipuler des tableaux de valeurs. Il prend en charge l'élément-sages des opérations mathématiques et diverses formes d'opérateurs en indice généralisées, le tranchage et l'accès indirect .
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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Sommaire

[modifier] Notes

Les classes std::valarray et aide sont définis pour être à l'abri de certaines formes de l'aliasing, ce qui permet des opérations sur ces classes d'optimiser semblable à l'effet du mot-clé restrict dans le langage de programmation C. En outre, les fonctions et les opérateurs qui prennent des arguments valarray sont autorisés à retourner des objets proxy pour permettre au compilateur d'optimiser une expression telle que v1 = a*v2 + v3; comme une simple boucle qui exécute v1[i] = a*v2[i] + v3[i]; éviter toute temporaires ou des passes multiples. Toutefois, modèles d'expression faire la même technique d'optimisation disponibles pour chaque conteneur C + +, et la majorité des bibliothèques numériques préfère modèles d'expression de valarrays de flexibilité. Certaines implémentations C + + bibliothèque standard utilisent des modèles d'expression pour mettre en œuvre des opérations efficaces sur std::valarray (par exemple libstdc + + GNU libc et LLVM + +), et rarement valarrays sont optimisés plus loin, par exemple, dans 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, modèles d'expression 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.
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[modifier] Types de membres

Type du membre Définition
value_type T

[modifier] Fonctions membres

construit une nouvelle matrice numérique
Original:
constructs new numeric array
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(fonction membre publique) [edit]
Détruit le tableau numérique
Original:
destructs the numeric array
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(fonction membre publique) [edit]
affecte le contenu
Original:
assigns the contents
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(fonction membre publique) [edit]
get / set élément valarray, tranche, ou un masque
Original:
get/set valarray element, slice, or mask
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(fonction membre publique) [edit]
applique un opérateur arithmétique unaire pour chaque élément de la valarray
Original:
applies a unary arithmetic operator to each element of the valarray
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(fonction membre publique) [edit]
s'applique opérateur d'affectation composé à chaque élément de la valarray
Original:
applies compound assignment operator to each element of the valarray
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(fonction membre publique) [edit]
swaps avec une autre valarray
Original:
swaps with another valarray
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(fonction membre publique) [edit]
renvoie la taille du valarray
Original:
returns the size of valarray
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(fonction membre publique) [edit]
modifie la taille du valarray
Original:
changes the size of valarray
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(fonction membre publique) [edit]
calcule la somme de tous les éléments
Original:
calculates the sum of all elements
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(fonction membre publique) [edit]
retourne le plus petit élément
Original:
returns the smallest element
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(fonction membre publique) [edit]
retourne le plus grand élément
Original:
returns the largest element
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(fonction membre publique) [edit]
zéro de remplissage déplacer les éléments de la valarray
Original:
zero-filling shift the elements of the valarray
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(fonction membre publique) [edit]
décalage circulaire des éléments de la valarray
Original:
circular shift of the elements of the valarray
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(fonction membre publique) [edit]
applies a function to every element of a valarray
(fonction membre publique) [edit]

[modifier] Fonctions annexes

l'algorithme spécialisé std::swap()
Original:
specializes the std::swap() algorithm
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(fonction générique) [edit]
std::begin spécialisée
Original:
specializes std::begin
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(fonction générique) [edit]
std::end spécialisée
Original:
specializes std::end
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(fonction générique) [edit]
des opérateurs binaires s'applique à chaque élément de valarrays deux, ou un valarray et une valeur
Original:
applies binary operators to each element of two valarrays, or a valarray and a value
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(fonction générique) [edit]
compare deux valarrays ou un valarray avec une valeur
Original:
compares two valarrays or a valarray with a value
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(fonction générique) [edit]
applique la fonction std::abs à chaque élément de valarray
Original:
applies the function std::abs to each element of valarray
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(fonction générique) [edit]
Les fonctions exponentielles
Original:
Exponential functions
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applique la fonction std::exp à chaque élément de valarray
Original:
applies the function std::exp to each element of valarray
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(fonction générique) [edit]
applique la fonction std::log à chaque élément de valarray
Original:
applies the function std::log to each element of valarray
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(fonction générique) [edit]
applique la fonction std::log10 à chaque élément de valarray
Original:
applies the function std::log10 to each element of valarray
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(fonction générique) [edit]
Les fonctions de puissance
Original:
Power functions
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applique la fonction à deux std::pow valarrays ou un valarray et une valeur
Original:
applies the function std::pow to two valarrays or a valarray and a value
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(fonction générique) [edit]
applique la fonction std::sqrt à chaque élément de valarray
Original:
applies the function std::sqrt to each element of valarray
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(fonction générique) [edit]
Les fonctions trigonométriques
Original:
Trigonometric functions
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applique la fonction std::sin à chaque élément de valarray
Original:
applies the function std::sin to each element of valarray
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(fonction générique) [edit]
applique la fonction std::cos à chaque élément de valarray
Original:
applies the function std::cos to each element of valarray
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(fonction générique) [edit]
applique la fonction std::tan à chaque élément de valarray
Original:
applies the function std::tan to each element of valarray
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(fonction générique) [edit]
applique la fonction std::asin à chaque élément de valarray
Original:
applies the function std::asin to each element of valarray
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(fonction générique) [edit]
applique la fonction std::acos à chaque élément de valarray
Original:
applies the function std::acos to each element of valarray
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(fonction générique) [edit]
applique la fonction std::atan à chaque élément de valarray
Original:
applies the function std::atan to each element of valarray
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(fonction générique) [edit]
applique la fonction de std::atan2 un valarray et une valeur
Original:
applies the function std::atan2 to a valarray and a value
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(fonction générique) [edit]
Fonctions hyperboliques
Original:
Hyperbolic functions
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applique la fonction std::sinh à chaque élément de valarray
Original:
applies the function std::sinh to each element of valarray
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(fonction générique) [edit]
applique la fonction std::cosh à chaque élément de valarray
Original:
applies the function std::cosh to each element of valarray
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(fonction générique) [edit]
applique la fonction std::tanh à chaque élément de valarray
Original:
applies the function std::tanh to each element of valarray
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(fonction générique) [edit]

[modifier] Classes d'aide

BLAS-like tranche d'un valarray: indice de départ, la longueur de foulée
Original:
BLAS-like slice of a valarray: starting index, length, stride
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(classe) [edit]
procuration d'un sous-ensemble d'un valarray après l'application d'une tranche
Original:
proxy to a subset of a valarray after applying a slice
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(classe générique) [edit]
tranche généralisée d'une valarray: indice de départ, un ensemble de longueurs, jeu de progrès
Original:
generalized slice of a valarray: starting index, set of lengths, set of strides
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(classe) [edit]
procuration d'un sous-ensemble d'un valarray après l'application d'une GSlice
Original:
proxy to a subset of a valarray after applying a gslice
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(classe générique) [edit]
procuration d'un sous-ensemble d'un valarray après l'application d'un opérateur booléen masque []
Original:
proxy to a subset of a valarray after applying a boolean mask operator[]
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(classe générique) [edit]
procuration d'un sous-ensemble d'un valarray après l'application de l'opérateur indirect []
Original:
proxy to a subset of a valarray after applying indirect operator[]
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(classe générique) [edit]