Espaces de noms
Variantes
Affichages
Actions

std::slice

De cppreference.com
< cpp‎ | numeric‎ | valarray

 
 
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
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
 
 
Defined in header <valarray>
class slice;
std::slice est le sélecteur de classe qui identifie un sous-ensemble de std::valarray similaire à tranche BLAS. Un objet de type de std::slice contient trois valeurs: l'index de départ, le pas et le nombre total de valeurs dans le sous-ensemble. Objets de std::slice type peut être utilisé comme index avec operator[] valarray de .
Original:
std::slice is the selector class that identifies a subset of std::valarray similar to BLAS slice. An object of type std::slice holds three values: the starting index, the stride, and the total number of values in the subset. Objects of type std::slice can be used as indexes with valarray's operator[].
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[modifier] Fonctions membres

construit une tranche
Original:
constructs a slice
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(fonction membre publique)
accède au début de la tranche
Original:
accesses the start of the slice
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(fonction membre publique)
accède à la taille de la tranche
Original:
accesses the size of the slice
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(fonction membre publique)
accède à la foulée de la tranche
Original:
accesses the stride of the slice
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(fonction membre publique)

[modifier] Exemple

Barebones classe Matrix valarray soutenu avec une fonction tracer calcul .
Original:
Barebones valarray-backed Matrix class with a tracer calculating function.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

#include <iostream>
#include <valarray>
class Matrix {
    std::valarray<int> data;
    int dim;
 public:
    Matrix(int r, int c) : data(r*c), dim(c) {}
    int& operator()(int r, int c) {return data[r*dim + c];}
    int trace() const {
        return data[std::slice(0, dim, dim+1)].sum();
    }
};
int main()
{
    Matrix m(3,3);
    int n = 0;
    for(int r=0; r<3; ++r)
       for(int c=0; c<3; ++c)
           m(r, c) = ++n;
    std::cout << "Trace of the matrix (1,2,3) (4,5,6) (7,8,9) is " << m.trace() << '\n';
}

Résultat :

Trace of the matrix (1,2,3) (4,5,6) (7,8,9) is 15

[modifier] Voir aussi

get / set élément valarray, tranche, ou un masque
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.

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

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

(classe générique) [edit]